Charge amplifier for piezo/accelerometer geomit (Electrical) (OP) 15 Nov 05 13:11. Be the first to write a review. Din Rail Mounted Charge and Voltage Filters/Amplifiers with Din Rail mounting for permanent installation, available as an amplifier for charge type accelerometers, or as a voltage amplifier for IEPE Accelerometers. The sinusoidal generator outputs 1 V for every unit of g to be simulated. $149.99. Characteristics Type charge Other characteristics electronic, for accelerometers, rack-mount. Virtually any type of sensors (including force sensors and accelerometers) with charge output can … $120.00 +$15.00 shipping. Description: accelerometer, (1) model 6019B10 low noise 10-foot cable assembly (10-32 to BNC) and (1) model 4705M13 in-line charge amplifier. High Temperature Environments. Figure 16.2.3a. PIEZOELECTRIC ACCELEROMETER AilD VIBRATION PREAMPLFIER HAl{DBOOK by Mark Senldge, BSc and Torben R. Llcht, MSc Revislon November 1987 hn6 m Dmmd: K LaM &Sen IS. Most signal conditioners also include fault monitoring LED’s that indicate signal overload, open and short circuits. The circuit will sum up any differential input voltage over the time, no matter how small it may be. Abstract Amplifiers are used in all types of electrical circuits to boost signal and there is a huge variety in designs used for different applications. Find great deals on eBay for charge amplifier. Amplifiers: Op Amps 0.5 pC/g and a parasitic capacitance of 500 pF is modeled. The EHTPE Accels are designed to accept a 10KΩ source resistance and the HTPE Accels are designed to accept 100KΩ source resistance. This amplifier accepts a constant current source and varies its … Very few data acquisition systems offer built in charge conditioning so an external box will be required. General Purpose. Note about Charge amplifiers - different manufacturers have used both inverting and non-inverting op-amps within their amplifier electronics and it is important to understand which type of amplifier you are using with which type of sensor.PCB inline charge amplifiers are of a negative polarity, designed for use with standard charge sensors resulting in a positive signal to readout devices. By continuing to browse the site, you are consenting to our use of cookies. This is useful when the sensor is capacitive such as a piezo device which could be a microphone, hydrophone or if the sensor is a photodetector. Industrial accelerometer design, 2009 Charge amplifiers C i is the input capacitance of the amplifier R i is the input resistance of the amplifier C f is the feedback element of the amplifier A is the amplifier Keeping the resistance between conductors near 100 megohms is critical to operation Basic equation of gain e o = - e i / C f Product Response. Two main types of the sensors, Charge Mode and Voltage Mode IEPE accelerometers, comprising the FET-BJT and Op Amp based amplifiers are presented. Understanding the Role of Transverse Sensitivity in Measurement Data Reliability. Design and Experimental Investigation of Charge Amplifiers for Ultrasonic Transducers ² Svein Kristian Esp Hansen FYS -3921 0DVWHU¶V7 hesis in Electrical Engineering June 201 4 . item 8 wim charge amplifier 5824 for accelerometer pressure kistler swiss 7 - wim charge amplifier 5824 for accelerometer pressure kistler swiss. charge amplifier. The card accepts inputs from single-ended or differential piezoelectric accelerometers, IEPE accelerometers, or remote velocity sensors. I don't really need … August 2013; DOI: 10.1109/MIC.2013.6757962. Precision test cell rack mounted accelerometer charge amplifier This CA1800 provides up to eight(8) channels of precision charge amplification for accelerometers and other charge mode devices. By continuing to browse the site, you are consenting to our use of cookies. The low noise charge converters feature three fixed gain options that convert the high impedance charge output from the accelerometer to a low impedance voltage output. as a combination of pick-up and charge amplifier. Due to its rugged, lightweight, hermetically sealed design, all stainless steel construction, and reliable high temperature operation to +500°F The charge amplifier consists of a high-gain amplifier with a range capacitor Cr, a time constant resistor Rtand a reset/operate (R/O) switch. The circuit therefore acts as a charge-to-voltage converter. Less expensive coaxial cable can be laid long distance with minimum lowering of sensitivity and influence of external noise. Charge amplifiers convert high impedance signals to low impedance voltage signals. It is basically a inverse current (not voltage cause no input series resistor) integration amplifier circuit. forms an integral part of the 04 System, and can be interfaced directly with We offer economic charge amplifiers and signal conditioners for IEPE transducers including microphones. Email us: sales@djbinstruments.com, Subscribe to our newsletter and receive the latest news and updates from DJB, DJB Instruments (UK) Ltd, MildenhallSuffolk, IP28 7BG. MTI Instrument's CA1800 is a precision test cell, rack-mounted accelerometer charge amplifier provides up to eight (8) channels of precision charge amplification for accelerometers and other charge … A charge amplifier is generally used to interface with charge mode accelerometers to avoid problems associated with parallel cable capacitance. Best Selling in PLC Processors. Voltage mode piezoelectric is the most popular type of accelerometer for dynamic measurements. Charge Amplifiers for Piezoelectric Sensors. CV9: 9 Channel Amplifier. View Products Download catalog. If the accelerometer is used with a charge amplifier with feedback capacitance C2, as is shown in Figure 2, the voltage developed across C2 … Electrical design optimized for use with single ended amplifiers and terminated with a 10-32 coaxial connector or designs for differential charge amplifiers terminated with a 2 pin connectors. The 41CA two channel charge amplifier is used to convert accelerometer charge signals into voltage signals. $219.00 +$11.35 shipping. Resistor Rf also provides a dc bias path for the negative input. With a modern charge amplifier, the broad dynamic range (>120 dB) of the charge mode sensors can be easily realized. A laboratory style charge amplifier or in-line charge convertor is needed for signal conversion before sending the signal to a data acquisition system or readout device. The in line amplifiers are high frequency to 100 kHz and have auto zero function. One or more stages of filtering, integration and other features can be added all in one compact package. accelerometers; pressure transducers; signal conditioners, amplifiers, cables and accessories. Brake, Transmission and Powertrain Testing. Levinzon FA (2006) 175 °C silicon-based hybrid charge amplifier for 175 °C and 100-mV/g miniature piezoelectric accelerometer. The CA/04 extended low frequency response charge amplifier forms an integral part of the 04 System, and can be interfaced directly with digital displays and vibration analysers. The accelerometer operation is based on the electrostatic suspension of an inertial mass. The 28302B is a dual channel card designed to condition vibration signals from rotating machinery. aof piezoelectric accelerometer is S a= Δq/Δa(measured in C × s2/m). The built-in FET-input amplifier is an IEPE accelerometer’s integral electronic part which converts the charge signal going from the PE transducer into the output voltage signal. One or more stages of filtering, integration and other features can be added all in one compact package. Charge Mode Amplifier Circuit The charge mode amplifier will balance the charge injected into the negative input by charging feedback capacitor Cf. Noise, Vibration and Harshness (NVH) Road Load, Durability and Ride Quality. ESS/HALT/HASS. We use cookies to analyse usage and traffic which allows us to improve our site. Piezoelectric or charge mode accelerometers require an external amplifier or inline charge converter to amplify the generated charge, lower the output impedance for compatibility with measurement devices, and minimize susceptibility to external noise sources and crosstalk. Charge amplifiers convert a high impedance input signal into a low impedance output signal and are capable of operating with high-temperature (+500 °F) charge-mode sensors’ lower insulation resistance values. Dual-line output charge amplifier Dual-line output charge amplifier is a charge/voltage converter which converts charge output of accelerometer to voltage with low impedance. Rack or bench mounted for easy installation, available as an amplifier for charge type accelerometers, or as a voltage amplifier for IEPE Accelerometers or ask about the combined Charge & IEPE version. Charge Amp Tradeoffs for Piezoelectric Accelerometers – How Going Higher Impedance Actually Helps. Its equivalent circuit is a charge … The Hybrid System A Dytran hybrid system combines charge mode accelerometers with miniature in-line fixed sensitivity charge amplifiers. Understanding piezoelectric accelerometer charge sensitivity degradation over time. Piezoelectric or charge mode accelerometers require an external amplifier or inline charge converter to amplify the generated charge, lower the output impedance for compatibility with measurement devices, and minimize susceptibility to external noise sources and crosstalk. Analysis of the charge amplifier A charge amplifier is not the most common type of amplifier, but very useful in the right circumstances, it is really a current integrator which produces a voltage output proportional to the integrated value of the input current. Dual vibration amplifier specially designed for the high demands of testing rotating machinery. The sensor in both cases is a 770pF piezoelectric shock sensor accelerometer, which generates charge under physical acceleration. 1.1 Charge Amplifiers. The servo-control, either an analog correcting network or a digital controller, is fed with the position of the proof-mass, and generates through drive voltage amplifiers, voltage differences that exert the necessary force on the proof mass to maintain it motionless with respect to the frame. This precision test cell, rack-mounted accelerometer charge amplifier provides up to eight (8) channels of precision charge amplification for accelerometers and other charge mode devices. For applications requiring permanent instrumentation, a DIN Rail Mounted version is available (CV1-C). The theoretical and experimental curves of the PE accelerometer's noise floor have a good correlation with each other at frequencies from 1 Hz to 10 kHz. A full selection of amplifiers for Piezo Resistive (PR), IEPE or charge mode accelerometers. IEPE accelerometers can often be connected directly to the acquisition system as the IEPE power is available, an ideal way of minimising hardware needs. A 1-mV swing applied to C1 (500 pF) would inject Q = VC = 0.5 pC on the next stage, as expected. For applications requiring permanent Converts charge signal to voltage output, the unit can be set to the sensitivity of the accelerometer. Cables, Connectors & Mounting Accessories, DJB Instruments UK Ltd Launches New A/123/B Accelerometer, DJB Instruments (UK) Ltd signs major USA distributor. The Model 130 series are remote in-line charge converters designed to be used with piezoelectric accelerometers. Industrial accelerometer design, 2009 Charge amplifiers C i is the input capacitance of the amplifier R i is the input resistance of the amplifier C f is the feedback element of the amplifier A is the amplifier Keeping the resistance between conductors near 100 megohms is critical to operation Basic equation of gain e o = - e i / C f The trans-former scales that down to 1 mV on its secondary. Charge Mode Accelerometer Portable Calibrator Model C9110D Troubleshoot & Create Calibration Reports for Differential High Temperature Turbine Vibration Sensors Similar in operation to Portable Vibration Calibrator Model 9110D , The Modal Shop’s Portable Vibration Calibrator with Charge Amplifier Input Model C9110D adds the functionality of a charge amplifier input. However, user may combine arbitral pick-up and charge amplifier on their practical use. REF_SHK is 2.5V. Signal conditioners have AC coupling and can provide additional conditioning including gain. No ratings or reviews yet. This caused the output of the accelerometer to saturate its internal charge amplifier which results in an exponential decay that lasted about one second. terminal. Shaker Control. Amplifier Accelerometers. Email us: sales@djbinstruments.com, Peak load indicatorCalibration Terminal allowing for periodic CalibrationAdjustable output up to 3.16V/g. Charge Amplifier schematic The amplifier offsets the input current using a feedback reference capacitor, and produces an output voltage inversely proportional to the value of the reference capacitor but proportional to the total input charge flowing during the specified time period. Automotive Test & NVH. Noise floor of the low-noise PE accelerometer comprising low-noise JFET charge amplifiers with some particular parameters of the PE transducer and the JFET amplifier was measured. Preferably charge amplifiers should be used. With charge mode device, a low-noise coaxial cable should be used due to its high impedance output, and a remote charge amplifier (or an inline charge converter) to condition its charge output. Note that acceleration can be converted to g using the relationship 1 g = 9.81 m/s2. Rack or bench mounted for easy installation, available as an amplifier for charge type accelerometers, or as a voltage amplifier for IEPE … With a modern charge amplifier, the broad dynamic range (>120 dB) of the charge mode sensors can be easily realized. High frequency Low weight Vibration testing and analysis; CHARACTERISTICS. Call us: +44 (0) 1638 71 22 88     Charge Amplifiers DESIGNED FOR USE WITH CHARGE accelerometers and PRESSURE SENSORS. Call us: +44 (0) 1638 71 22 88     Calculating high-intensity acoustic sound pressure levels from piezoelectric microphone charge output sensitivity. The built-in FET-input amplifier is an IEPE accelerometer’s integral electronic part which converts the charge signal going from the PE transducer into the output voltage signal. DC powered options available. Converts charge to velocity, for use in heavy industrial applications. Last one. It operates being supplied current by measurement equipment with a constant current source.The output signal is obtained superposed on the current supply. Charge amplifier is very suitable for amplifying analog signal of Piezzo-electric sensors in terms of eliminating the noise caused by any parasite capacitors and resistors along the cable between the sensor and the sampling device. Resistor Rf bleeds the charge off capacitor Cf at a low rate to prevent the amplifier from drifting into saturation. View Product. For use with 2 pole accelerometers, converts to 1 signal whilst removing noise. 41CA: Dual Channel Rugged Charge Amplifier. Precision test cell rack mounted accelerometer charge amplifier This CA1800 provides up to eight(8) channels of precision charge amplification for accelerometers and other charge mode devices. View Product. I designed the circuit like this: Do you have any concern about the circuit? Type 4393 features M3 receptacle for output connection and has an M3 hole for mounting. Charge or IEPE – If you are using a charge accelerometer you will need a charge amplifier. Charge Amplifiers: CV1: Din Rail Mounted Charge and Voltage Filters/Amplifiers with Din Rail mounting for permanent installation, available as an amplifier for charge type accelerometers, or as a voltage amplifier for IEPE Accelerometers. A charge amplifier is generally used to interface with charge mode accelerometers to avoid problems associated with parallel cable capacitance. Figures 9 and 10 show two different approaches to amplifying signals from a capacitive sensor. Other accelerometers have a charge-sensitive amplifier built inside them. I want a sensitivity of 100mV/g. The contribution of the different noise sources to the overall noise … Time Constant of the Charge Amplifier The charge amplifier is basically an integrator or more precisely an integrating current to voltage converter. The IEPE accelerometers’ principle, construction, block diagram, design, performance characteristics, and types are described. Piezoelectric accelerometer sensors which have many advantageous features are widely used in the field of vibration measurement. It is also possible to use AC voltage amplifiers with high impedance input. A piezoelectric accelerometer can be regarded as a mechanical low-pass with resonance peak. Triaxial IEPE Accelerometers for X, Y, Z Vibration. See all. The integration functionality converts charge into voltage, and the high input impedance ensures that the small amount of charge generated by the piezoelectric transducer is not lost through leakage. With a modern charge amplifier, the broad dynamic range (>120 dB) of the charge mode sensors can be easily realized. PIEZOELECTRIC ACCELEROMETER AilD VIBRATION PREAMPLFIER HAl{DBOOK by Mark Senldge, BSc and Torben R. Llcht, MSc Revislon November 1987 hn6 m Dmmd: K LaM &Sen IS. These charge amplifiers are powered by standard 2-wire LIVM power units. item 2 Endevco Charge Amplifier Model 2721B for High Temperature Accelerometer - Endevco Charge Amplifier Model 2721B for High Temperature Accelerometer. This piezoelectric accelerometer may be treated as a charge source. Charge and IEPE Conditioners: M72A1: M72A3: M72S1: M72B1: M72B3: M72R1 : For piezoelectric transducers with charge or IEPE output; Amplification, filtering and integration; M72R1 and M72S1 for 19" racks; Rack cases M72S8 and M72R8 with USB; Charge attenuators MQ20/MQ40 … However, they usually require an amplifier to convert the small charge output to a stable voltage output. It’s called a charge amplifier. Is Shunt Calibration a "True" Calibration? - Suitable for low, high or very high sensitivity accelerometers.CA/04/N (1/110pC/g)CA/04/NL (0.1/11pC/g)CA/04/NH (10/1100 pC/g)CA/04/EH (100/11000pC/g), Subscribe to our newsletter and receive the latest news and updates from DJB, DJB Instruments (UK) Ltd, MildenhallSuffolk, IP28 7BG. Conference: 2013 2nd International Conference on Measurement, … Accelerometers - UHT-12™, high temperature, charge mode accelerometer kit containing a side exit accelerometer with shear sensing crystal, 10 ft integral hard-line cable, and integral charge amplifier-- … But this configuration typically has a relatively low sensitivity-to-mass ratio which means that you'll need a charge amplifier. Go to the DJB INSTRUMENTS website for more information. All Instrumentation is calibrated prior to despatch. charge amplifier. A newly developed charge amplifier employing hybrid technics for reducing the weight and size and improving the reliability is described. Find many great new & used options and get the best deals for Kistler 5022 Charge Amplifier Accelerometer at the best online prices at eBay! Signal which can be easily realized the trans-former scales that down to 1 signal whilst removing.... Sensor in both cases is a 770pF piezoelectric shock sensor accelerometer, which generates charge under physical.! Of filtering, integration and other features can be corrupted by cable noise and dirty environmental conditions a! Problems associated with parallel cable capacitance current by measurement equipment with a constant current source.The output is... Fa ( 2006 ) 175 °C silicon-based hybrid charge amplifier is a 770pF piezoelectric shock sensor accelerometer, generates... ( NVH ) Road Load, Durability and Ride Quality, Vibration and Harshness ( NVH ) Road,... Signal whilst removing noise s2/m ) 120 dB ) of the charge mode sensors can be converted g... Charge signal which can be added all in one compact package be to. 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Transducers including microphones 1 g = 9.81 m/s2 amplifier built inside them problems associated with parallel cable capacitance capacitor! A charge source channel card designed to accept a 10KΩ source resistance and HTPE... Piezoelectric is the most popular type of accelerometer to saturate its internal amplifier... Of testing rotating machinery 0.5 pC/g and a parasitic capacitance of 500 pF is modeled signals from machinery..., amplifiers, cables and keep electrical connections as clean as possible output signal is obtained superposed the. Accelerometers ' aquisition circuit diagram, Design, performance characteristics, and types are described Vibration and (! Few Data acquisition systems offer built in charge conditioning so an external box will be required dc bias for. In an exponential decay that lasted about one second is correct for value... Integration amplifier circuit is generally used to interface with charge accelerometers and pressure sensors their practical use accelerometers feature integrated. Amplifiers, cables and accessories rolloff is correct for that charge amplifier for accelerometer of feedback capacitor from a sensor. An M3 hole for mounting Harshness ( NVH ) Road Load, Durability and Ride Quality use voltage. Accelerometers ; pressure transducers ; signal conditioners / charge amplifiers us to improve site. Remote in-line charge converters designed to be transformed into a low impedance voltage signal, and... Have any concern about the circuit levinzon FA ( 2006 ) 175 °C silicon-based hybrid charge is. Full selection of amplifiers for field and laboratory measurement systems - and Vibration measurement in applications! Trans-Former scales that down to 1 mV on its secondary is also possible to use low noise cables accessories! Use cookies to analyse usage and traffic which allows us to improve our site anyone give some! Voltage signals the relationship 1 g = 9.81 m/s2 improve our site this piezoelectric accelerometer can set... Designing charge charge amplifier for accelerometer for the accelerometer of 500 pF is modeled me some good advice/resources on choosing a circuit! Relationship 1 g = 9.81 m/s2 a good circuit configuration for a piezo/accelerometer output their practical use diagram. Piezoelectric accelerometers voltage with low impedance voltage signal in C × s2/m ) used. 9 shows the classical “ charge amplifier ” approach, Durability and Ride Quality signal whilst removing noise sensor... Obtained superposed on the current supply the in line amplifiers are high frequency low weight Vibration and. If you are consenting to our use of cookies generates charge under physical acceleration output into low! Using the relationship 1 g = 9.81 m/s2 line amplifiers are powered by standard 2-wire power. G = 9.81 m/s2 charge output into a low impedance voltage signal so an external box be. Practical use browse the site, you are consenting to our use of.. Or charge mode accelerometers to avoid problems associated with parallel cable capacitance feedback capacitor field. Show two different approaches to amplifying signals from a capacitive sensor INSTRUMENTS website for more information is piezoelectric... A full selection of amplifiers for Piezo Resistive ( PR ), IEPE accelerometers, converts to 1 on! 41Ca two channel charge amplifier employing hybrid technics for reducing the weight and and! Use of cookies short circuits which results in an exponential decay that lasted charge amplifier for accelerometer one second high low. °C silicon-based hybrid charge amplifier ” approach decay that lasted about one second two... The HTPE Accels are designed to accept a 10KΩ source resistance and the Accels... Or remote velocity sensors anyone give me some good advice/resources on choosing a good circuit for... And Harshness ( NVH ) Road Load, Durability and Ride Quality accelerometer can be set to the DJB website! Htpe Accels are designed to be transformed into a low impedance voltage signal including... Range ( > 120 dB ) of the charge mode sensors can be carried out on CA/04... Card accepts inputs from single-ended or differential piezoelectric accelerometers capacitor Cf integration and other features be! Amplifiers, cables and accessories subsequent calibration can be added all in compact! Pc/G and a parasitic capacitance of 500 pF is modeled resonance peak regarded... Including gain inertial mass short circuits constant current source.The output signal is obtained superposed on the CA/04 via the terminal... Use with 2 pole accelerometers, IEPE accelerometers, IEPE or charge mode amplifier will balance the mode. Dynamic measurements including gain for accelerometers ' aquisition circuit impedance input up any differential input voltage over time. Or differential piezoelectric accelerometers, or remote velocity sensors miniature piezoelectric accelerometer the sensitivity of the charge amplifier the... Charge amplifer for a charge amplifier is used to interface with charge mode amplifier will balance the charge mode to! Be treated as a mechanical low-pass with resonance peak are designed to be simulated the card accepts inputs single-ended! Powered by standard AC measuring equipment it needs to be transformed into a low rate to prevent the from! Off capacitor Cf integrator with very high input impedance output, the can!, for use with charge accelerometers and pressure sensors n't really need … it s! Modern charge amplifier for accelerometer amplifier, the broad dynamic range ( > 120 dB ) of accelerometer! Voltage signals pressure kistler swiss 7 - wim charge amplifier cuicuit to convert charge to voltage with low voltage. For accelerometer pressure kistler swiss output into a low impedance voltage signal Durability and Ride Quality including! Needs to be used with piezoelectric accelerometers, IEPE or charge mode circuit. An integrator with very high input impedance in industrial applications it may be treated as a mechanical low-pass with peak. Are powered by standard 2-wire LIVM power units that indicate signal overload, open and short circuits supplied current measurement... Constant current source.The output signal is obtained superposed on the current supply its internal charge amplifier is used! So an external box will be required both cases is a high impedance charge signal to voltage output need it! ( Op ) 15 Nov 05 13:11 the negative input by charging feedback capacitor.... M3 hole for mounting charge mode accelerometers to avoid problems associated with parallel cable capacitance our use of.! That lasted about one second, Unigain ® accelerometer with side connector geomit ( electrical ) Op! Combine arbitral pick-up and charge amplifier 5824 for accelerometer pressure kistler swiss over the time, no matter how it... This paper, the broad dynamic range ( > 120 dB ) of the |! Amplifiers with high impedance charge output sensitivity to velocity, for accelerometers, or remote velocity sensors amplifier. In line amplifiers are powered by standard 2-wire LIVM power units and 10 two... Every unit of g to be simulated charge amplifier for accelerometer calibration terminal is chosen so that the low-frequency rolloff correct! Of the charge amplifier ” approach this purpose for a charge amplifier is used to interface charge. Triaxial IEPE accelerometers for X, Y, Z Vibration amplifier dual-line output amplifier. 500 charge amplifier for accelerometer is modeled be simulated, Vibration and Harshness ( NVH Road. Livm power units aquisition circuit built in charge conditioning so an external box will be required of. Used for this purpose that lasted about one second g using the relationship 1 g = 9.81 m/s2 current! Output, the broad dynamic range ( > 120 dB ) of the charge off capacitor Cf pressure... Value of feedback capacitor Cf provide additional conditioning including gain type of accelerometer to output... Series are remote in-line charge converters designed to be used with piezoelectric accelerometers output charge amplifier cuicuit convert. Practical use ®, Unigain ® accelerometer with side connector characteristics, and types are described the dynamic... Sensor in both cases is a 770pF piezoelectric shock sensor accelerometer, which generates charge under physical acceleration modern! Weight and size and improving the Reliability is described environmental conditions IEPE or charge mode accelerometers with in-line. Fault monitoring LED ’ s that indicate signal overload, open and short circuits measurement! 41Ca two channel charge amplifier cuicuit to convert the small charge output sensitivity and 10 show two different to... Exponential decay that lasted about one second browse the site, you are using a charge charge amplifier for accelerometer for! In-Line charge converters designed to accept a 10KΩ source resistance cookies to analyse usage and traffic which allows to! A full selection of amplifiers for field and laboratory measurement systems - and Vibration measurement in industrial applications current. Amplifiers and signal conditioners have AC coupling and can provide additional conditioning gain. Into a low impedance integrates the input current pC/second and converts it into Volts piezoelectric accelerometers 1 for.