| Acceleration sensors are widely used in many areas of industrial production. But due to their own shortcomings, traditional acceleration sensors are impossible in some areas of application of sophisticated. SAW accelerometer as a high sensitivity , excellent linearity, as well as strong anti-interference ability inertial sensors has been widely used in aviation and aerospace and automotive manufacturing field. Therefore, the in-depth study of SAW accelerometer sensing mechanism and detection technology, not only of theoretical significance, but also of practical engineering value.This paper improves the differential fabric of the traditional cantilever-type SAW acceleration sensor and perfect the whole signal detection system of it. The exact achievements in the cantilever-type SAW acceleration sensor of this paper are following by:1: To tie in with the follow-up mixer circuit and the brand-new measurement method, the traditional differential programs of the SAW acceleration sensor has been improved, which well restraint the impact on the accelerometer out of the temperature disturbance, and also reduces the difficulty of its manufacture.2: In order to make frequency count unit can work properly designs low-pass filter amplifier circuit uses Multisim10 for a simulation research of them. The results show that the designed filter amplifier circuit is fully meet the system requirements all the parameters are close to the theoretical value.3: We can calculate the corresponding acceleration through the measurement of the system output frequency. The traditional method of equivalent precision frequency measurement have±1errors of standard signal, this paper have improved the method to eliminate the error.4: The traditional frequency measurement has a larger bandwidth for low-frequency signals. This paper presents a new frequency measurement which applied the all-pass filter of SAW to improve the low-frequency signal measurement accuracy. |
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