Triaxial quartz flexure accelerometer small-size signal sampling device and processing technology thereof

Abstract

The invention discloses a triaxial quartz flexure accelerometer small-size signal sampling device comprising an accelerometer. The device also comprises a signal collection mechanism that comprises apre-amplification module, a switch module, a differential amplification module, an AD conversion module and a controller-integrated FPGA main control module which are sequentially connected with the accelerometer in series; and the switch module is also connected with the FPGA main control module. By using the triaxial quartz flexure accelerometer small-size signal sampling device adopting the abovementioned structure provided by the invention, a digital sub-system substrate and an analog sub-system substrate are perpendicularly interconnected via solder balls, so that the whole size is reduced, the miniaturization is achieved; meanwhile, by using the FPGA main control module, the collection and conversion from an accelerometer analog signal to a digital signal are achieved, the linear relation between the output digital signal and the acceleration signal is ensured, and the stability of zero and scale can be ensured, so that the performance of the header of the accelerometer is furthest ensured.

Description

technical field [0001] The invention relates to a signal acquisition technology, in particular to a small-scale signal sampling device for a three-axis quartz flexible accelerometer and a processing technology thereof. Background technique [0002] Quartz flexible accelerometer (referred to as accelerometer) belongs to the force feedback accelerometer, is a sensitive speed sensor, has the characteristics of small size, long life, stable performance, high measurement accuracy, widely used in aircraft, missiles, rockets, ships, Vehicle inertial navigation system and oil drilling, construction, dip measurement of dams and earthquake monitoring, etc. [0003] The traditional quartz flexible accelerometer outputs analog current. After the analog-to-digital conversion is completed by the IF conversion circuit (current-frequency conversion circuit), the final digital information can be used by the system. This scheme is stable for the timing pulse source and constant current source...

AI Technical Summary

Problems solved by technology

[0003] The traditional quartz flexible accelerometer outputs analog current. After the analog-to-digital conversion is completed by the IF conversion circuit (current-frequency conversion circuit), the final digital information can be used by the system. This scheme is stable for the timing pulse source and constant current source. high demands on stability, temperature stability and symmetry, resulting in higher manufacturing costs

[0004] At the same time, when the existing quartz flexible accelerometers are applied to high-end carriers such as aerospace rockets and airplanes, most of the existing assembly uses multiple discrete PCB boards to realize circuit functions, compared with the small size of the meter head of about 500 square millimeters , the circuit part is too huge and redundant, which seriously restricts the miniaturization development of the entire accelerometer system

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