Multi-channel AC/DC excitation signal measuring system for strain force sensor
A force sensor and AC excitation technology, applied in the field of force detection, can solve the problems of inaccurate measurement and the same frequency band noise interference of strain-type force sensors, and achieve the effect of increasing the signal amplitude and reducing the influence of parasitic parameters.
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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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