A signal measurement system for multi-channel AC/DC excitation for strain gauge force sensors
A technology of force sensor and AC excitation, applied in the field of force detection, can solve the problems of inaccurate measurement, noise interference in the same frequency band of the strain type force sensor, etc., and achieve the effect of increasing the signal amplitude and reducing the influence of parasitic parameters
Active Publication Date: 2020-11-17
HEFEI UNIV OF TECH
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Problems solved by technology
[0005] The present invention aims to solve the problem that the strain gauge force sensor cannot be accurately measured due to the noise interference of the same frequency band under different interference environments. Multi-channel strain gauge force sensor signal measurement system with artificial setting or automatic selection of excitation mode, excitation frequency and measurement bandwidth for noise conditions
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[0057] The present invention will be further described below in conjunction with the accompanying drawings.
[0058] The design idea of the present invention is: aiming at the signal measurement problem of strain gauge force sensors under different interference environments, DC or different frequency AC excitation methods are used to provide excitation signals to the measurement bridge of strain gauge force sensors, and the measured force signals are Modulation, the effective signal frequency band output by the sensor is modulated from the low frequency band where the measured force signal is actually located to a frequency band less disturbed by noise to separate it from the noise frequency band; then, the excitation signal and output signal of the sensor are simulated Conditioning and synchronous sampling, converting it into a digital signal and sending it to the digital signal processor DSP for digital processing; the digital signal processor DSP processes the signal throu...
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The invention relates to a multi-channel AC / DC excitation signal measuring system for a strain force sensor. A digital signal processor (DSP) is taken as the core, an AC / DC excitation mode is adoptedto select an excitation scheme with adjustable AC excitation frequency, a digital control scheme with automatic optimization of excitation frequency and modulation frequency band is adopted, a digitallow-pass filter, amplitude correction and digital signal amplification processing flow is adopted for a DC excitation mode, and a digital band-pass filter, digital signal demodulation, vector correction and digital signal amplification processing flow is adopted for an AC excitation mode, so that multi-channel and high precision signal measurement of the strain force sensor under different interference environments is realized. The system includes a hardware system and a software signal processing method. Through adoption of the multi-channel AC / DC excitation signal measuring system, the selection of the excitation mode and the signal processing flow can be automatically optimized, and the influences of excitation signal fluctuation and line parasitic parameters can be corrected, therebyrealizing high-precision measurement of single or multiple strain force sensors with up to eight measuring bridges.
Description
technical field [0001] The invention relates to the field of force detection, and is a signal measurement system of a strain gauge force sensor, in particular, a digital signal processor as the core, which can select AC excitation and DC excitation and adopts digital signal processing methods to realize the detection of different interference environments. A multi-channel signal measurement system for high-precision measurement of the output signal of the strain gauge force sensor. Background technique [0002] Strain force sensors are widely used in scientific experiments and industrial automation due to their simple structure, small size, high measurement accuracy, and stable performance. With the development of technology, strain gauge force sensors are not only used for single-dimensional force measurement, but also made into integrated, compact multi-dimensional force / torque sensors with multiple measurement channels, which are widely used in scientific experiments and ...
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IPC IPC(8): G01L1/22G05B19/042
CPCG01L1/2262G01L1/2268G05B19/0428G05B2219/2612
Inventor 杨双龙谷恒徐科军王俊翔丁瑞好黄云志梁利平郁明
Owner HEFEI UNIV OF TECH