DSP implementation of calibration algorithm for piezoresistive pressure sensor

Feng Li; Jianhang Yu; Ying Gao; Yanfeng Jiang

Feng Li Jiangnan University
Jianhang Yu Jiangnan University
Ying Gao Jiangnan University
Yanfeng Jiang Jiangnan University

Article ID: 196

222 Views, 192 PDF Downloads

Keywords: piezoresistive pressure sensor, calibration, temperature compensation, FPGA verification

Abstract

In this paper, a novel calibration algorithm for piezoresistive pressure sensors is proposed to address the problems of deviation from the zero point, nonlinearity, zero temperature drift, sensitivity temperature drift, etc. Firstly, the data is obtained through experimental tests. On the basis of analyzing the calibration principle of the pressure sensor calibration algorithm, the calibration coefficients are calculated. Then, the calibration algorithm is applied to obtain the calibrated output. In order to make the calibration algorithm applied to a high-end pressure sensor with a reduced cost, the calibration algorithm is implemented into a DSP chip (Digital Signal Processing). With the consideration of floating-point arithmetic processing and error interception, the synthesized DSP chip shows the advantages of fast arithmetic speed and low cost, which is of good value for engineering applications.

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