Hydraulic square pressure generator for dynamic calibration of pressure sensors at low frequencies

H. Chang; T. T. Tsung; C. S. Jwo; S. H. Wang

doi:10.1117/12.885822

31 December 2010 Hydraulic square pressure generator for dynamic calibration of pressure sensors at low frequencies

H. Chang, T. T. Tsung, C. S. Jwo, S. H. Wang

Proceedings Volume 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation; 754430 (2010) https://doi.org/10.1117/12.885822
Event: Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010, Hangzhou, China

Abstract

A hydraulic square pressure generator with a unique spool valve has been developed for use in a system to calibrate and evaluate the dynamic characteristics of pressure sensors. This hydraulic square pressure generator generates a hydraulic square pressure with a rapid transient response in the time domain and with abundant harmonics in the frequency domain at low fundamental frequencies, rather than square pressure with poor harmonics at high fundamental frequencies. Its rise time and fundamental frequency are around 32.0 μs and 5 Hz, respectively, supporting a wide range of dynamic calibration of hydraulic square pressure generators. The sensing cavity in the hydraulic square pressure generator constrains the pressure transient produced by the fluid in the valve and maintains the generated hydraulic square pressure for both tested and reference pressure sensors. Three pressure sensors are calibrated using the hydraulic square pressure produced by the system with an auto-regressive exogenous model. Their transfer functions are obtained by applying the common pole-zero principle to describe their dynamic characteristics in the frequency domain.

Citation Download Citation

H. Chang, T. T. Tsung, C. S. Jwo, and S. H. Wang "Hydraulic square pressure generator for dynamic calibration of pressure sensors at low frequencies", Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 754430 (31 December 2010); https://doi.org/10.1117/12.885822

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