Piezoelectric Shakers for Wide-Frequency Calibration of Vibration Pickups

Articles you may be interested inHigh sensitivity optomechanical reference accelerometer over 10 kHz Appl. Phys. Lett.Abstract. Calibration of vibration transducers requires sinusoidal motion over a wide frequency range with low distortion and low cross-axial motion. Piezoelectric shakers are well suited to generate such motion and are suitable for use with laser interferometric methods at frequencies of 3 kHz and above. An advantage of piezoelectric shakers is the higher achievable accelerations and displacement amplitudes as compared to electro-dynamic (ED) shakers. Typical commercial ED calibration shakers produce maximum accelerations from 100 m/s 2 to 500 m/s 2 . Very large ED shakers may produce somewhat higher accelerations but require large amplifiers and expensive cooling systems to dissipate heat. Due to the limitations in maximum accelerations by ED shakers at frequencies above 5 kHz, the amplitudes of the generated sinusoidal displacement are frequently below the resolution of laser interferometers used in primary calibration methods. This limits the usefulness of ED shakers in interferometric based calibrations at higher frequencies.Small piezoelectric shakers provide much higher acceleration and displacement amplitudes for frequencies above 5 kHz, making these shakers very useful for accelerometer calibrations employing laser interferometric measurements, as will be shown in this paper. These piezoelectric shakers have been developed and used at NIST for many years for high frequency calibration of accelerometers. This paper documents the construction and performance of a new version of these shakers developed at NIST for the calibration of accelerometers over the range of 3 kHz to 30 kHz and possibly higher. Examples of typical calibration results are also given.

Section: Introductionmentioning

confidence: 88%

“…The methods for piezoelectric shaker design and construction were developed and documented by Jones in Reference [1]. A typical commercial ED shaker may produce 100 m/s 2 to 200 m/s 2 .…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Shaker Development for High Frequency Calibration of Accelerometers

Payne¹,

Harper²,

Vogl³

2010

“…By measuring the phase difference of signals from any two accelerometers, one can get a good indication of the degree of piston-like motion of the shaker [2]. For frequencies above 15 kHz, this test should be performed as part of evaluating the uncertainties associated with the calibration process.…”

Section: Calibration Of Accelerometers At Extended Frequenciesmentioning

confidence: 99%

“…A significant extension of the upper frequency range of calibration is possible with the use of new high-resolution digital sampling equipment together with the improved piezoelectric shaker to supply the motion. Figure 1 shows the smaller NIST shaker P103 based on a design developed by Jones [2] for calibration of accelerometers at frequencies higher than 20 kHz. Figure 2 gives the approximate accelerations obtainable over the frequency range of 3 kHz to 50 kHz when measured at the top center of the P102 and P103 shakers using a drive signal of 0.8 V. When used in performing calibrations, a power amplifier and step-up transformer are used to obtain the larger accelerations needed.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric shaker developments for calibration of accelerometers at extended frequencies

Payne

Evans

2012

Piezoelectric shakers are well suited to generate motion suitable for use with laser interferometric methods at frequencies of 3 kHz and above. One advantage of piezoelectric shakers is the higher achievable accelerations and displacement amplitudes as compared to electrodynamic (ED) shakers. Another advantage is the use of a solid ceramic construction rather than a compliant suspension system which results in much lower mechanical noise.Piezoelectric shakers have been developed and used at NIST for many years for high frequency calibration of accelerometers. Previous papers have documented the performance of these shakers for the calibration of accelerometers over the range of 3 kHz to 25 kHz using interferometric calibration methods. Piezoelectric shakers with solid ceramic construction coupled with new high resolution data acquisition systems have made it possible to extend the calibration of accelerometers to smaller amplitudes and a broader range of frequencies. These factors have also allowed calibrations to be performed over a wide range of accelerations rather than over a relatively limited range of accelerations. This paper presents these topics and gives examples of the results of calibrations performed using a piezoelectric shaker and a high resolution data acquisition systems.

“…For decades, piezoelectric shakers have been developed and used at the National Institute of Standards and Technology (NIST) for calibration of accelerometers [1], and recently, NIST researchers built new piezoelectric shakers in the hopes of enabling calibrations with reduced uncertainties and extended frequency ranges beyond 20 kHz [2]. The ability to build and measure piezoelectric shakers invites modeling of these systems in order to better their designs for improved calibration of accelerometers.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Analysis of Piezoelectric Shakers for High-Frequency Calibration of Accelerometers

Vogl¹,

Harper²,

Payne³

2010

Articles you may be interested inResonant frequency and damping of a coupled resonant system measured by apparent dissipation factor frequency spectra Rev. Sci. Instrum. 84, 085110 (2013);Abstract. Piezoelectric shakers have been developed and used at the National Institute of Standards and Technology (NIST) for decades for high-frequency calibration of accelerometers. Recently, NIST researchers built new piezoelectric shakers in the hopes of reducing the uncertainties in the calibrations of accelerometers while extending the calibration frequency range beyond 20 kHz. The ability to build and measure piezoelectric shakers invites modeling of these systems in order to improve their design for increased performance, which includes a sinusoidal motion with lower distortion, lower cross-axial motion, and an increased frequency range. In this paper, we present a model of piezoelectric shakers and match it to experimental data. The equations of motion for all masses are solved along with the coupled state equations for the piezoelectric actuator. Finally, additional electrical elements like inductors, capacitors, and resistors are added to the piezoelectric actuator for matching of experimental and theoretical frequency responses.