Measurement of angular accelerations, angular velocities and rotation angles by grating interferometry

Täubner, Angelika; Martens, Hans-Jürgen von

doi:10.1016/s0263-2241(98)00042-6

Cited by 25 publications

(11 citation statements)

References 7 publications

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“…2. The LDV output signal contains random errors caused by scattered particles, which can reduce measurement accuracy, and collaborative gratings can effectively reduce random errors [22,23]. 3.…”

Section: Ldvmentioning

confidence: 99%

Reference velocity demodulation method for accelerometer shock testing based on enhanced CEEMD and threshold correction

Zhang,

Song

et al. 2023

Meas. Sci. Technol.

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High-G accelerometers are critical for measuring high shock signals and must be calibrated to improve measurement accuracy. A laser Doppler velocimeter (LDV) is required to calibrate a high-G accelerometer to provide a high-precision reference velocity. The LDV signal must be demodulated to obtain the velocity. However, the phase method is susceptible to noise interference, while the conventional periodic distribution method is challenging to demodulate and severely affected by signal oscillations. We propose a novel periodic distribution method based on enhanced complementary ensemble empirical mode decomposition (CEEMD) and threshold correction (PDECTC) to demodulate the LDV signal. First, the LDV signal is processed with CEEMD to obtain multiple intrinsic mode functions (IMFs) and the residual. Next, each IMF is partially zeroed to obtain the noise-reduced LDV signal. Then, the over-threshold peak of the noise-reduced LDV signal is calculated. Finally, the demodulated velocity of the LDV signal is obtained by correcting the noise-reduced LDV signal according to the over-threshold peak point and calculating all the zero points. Simulation and experimental results show that the proposed method outperforms the phase method based on enhanced CEEMD (PEC) and the periodic distribution method based on enhanced CEEMD (PDEC) and can significantly reduce noise interference. The results show that the proposed method can accurately demodulate the LDV signal to obtain a highly accurate reference velocity, improving the reliability of accelerometer shock testing.

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Section: Ldvmentioning

confidence: 99%

Reference velocity demodulation method for accelerometer shock testing based on enhanced CEEMD and threshold correction

Zhang,

Song

et al. 2023

Meas. Sci. Technol.

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“…When applying reflectors with conventional mirror surfaces the problems arising from the additional mass, its mechanical coupling, a small geometrical operating range and a lateral beam shift have to be taken into consideration. A different way to achieve a speckle-free reflection is the use of a diffraction grating, which retro-reflects a diffracted beam at certain angles [4].…”

Section: Signal-to-noise Ratiomentioning

confidence: 99%

Traceability of dynamic force and torque calibrations by means of laser Doppler interferometry

Bruns

Kobusch

2004

SPIE Proceedings

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In contrast to the fact that a huge class of industrial force and torque measurement applications are of dynamic type, the standard calibration methods for the facilitated transducers are still of static type. The presented paper gives an introduction to recent developments at the Physikalisch-Technische Bundesanstalt (PTh), the German national metrology institute, towards new dynamic calibration methods for force and torque. In addition to the already established sinusoidal force calibration, two new facilities have been developed over the last three years which are concerned with the generation of impact forces and periodic torque respectively.For the primary dynamic force and torque calibration facilities the preferred way to provide traceability is the measurement of the motion of an accelerated mass or mass distribution. The means of measurement for primary calibration therefore are laser-Doppler-interferometers (LDI), which are utilized in very special ways.

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“…It is worth noting that several methods for angular vibration calibration based on laser interferometer were introduced in ISO 2006, which can be classified into two categories: type A based a Michelson or a Mach-Zehnder interferometer with retro-reflectors, and type B based on a Michelson or a Mach-Zehnder interferometer with a circular diffraction grating [11]. For type B, researcher from Physikalisch-Technische Bundesanstalt devoted lots of efforts into investigation of grating interferometer based on homodyne technique and heterodyne technique, and several prototypes were developed and used for dynamic angle measurement [12]. Although this grating interferometer has a high measurement accuracy and a wide measurement range of up to 360 • , its measurement precision is limited by circular diffraction grating and the high fabrication cost should also be considered.…”

Section: Introductionmentioning

confidence: 99%

Investigation of heterodyne interferometer technique for dynamic angle measurement: error analysis and performance evaluation

Wang

Yang

et al. 2021

Meas. Sci. Technol.

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Angle measurement based on heterodyne interferometer has been attracted much research interest and applied in various fields ranging from scientific research to practical engineering. However, a systematic research on the typical heterodyne angular interferometer has not been presented before. This paper mainly focused on the error analysis of the heterodyne angular interferometer and its dynamic measurement performance. The influence of error factors originating from optical configuration, mechanical installation and environmental fluctuations on measurement accuracy is analyzed. Furthermore, the performance of the angle interferometer in measuring dynamic angle, especially for high-frequency angular vibration, is evaluated by using a high-frequency angular vibration system and an interferometric fiber optic gyroscope. Finally, the measurement capability and uncertainty of this angle interferometer are also discussed.

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Measurement of angular accelerations, angular velocities and rotation angles by grating interferometry

Cited by 25 publications

References 7 publications

Reference velocity demodulation method for accelerometer shock testing based on enhanced CEEMD and threshold correction

Reference velocity demodulation method for accelerometer shock testing based on enhanced CEEMD and threshold correction

Traceability of dynamic force and torque calibrations by means of laser Doppler interferometry

Investigation of heterodyne interferometer technique for dynamic angle measurement: error analysis and performance evaluation

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