Digital high-precision temperature measurement system and method of relative gravimeter

Abstract

The invention relates to a digital high-precision temperature measurement system and method for a relative gravimeter, and the method comprises the steps: constructing a bridge circuit comprising a 44008 thermistor, providing a constant current for the bridge circuit through an REF constant current source circuit, carrying out the gain buffering of the voltage of the 44008 thermistor, carrying out the analog-to-digital conversion of the voltage through an A / D converter, and finally inputting the voltage into an RAM processor for the fitting of the voltage and temperature. Through a bidirectional CAN bus, the RAM processor transmits the temperature data to the gravimeter display controller, and the display controller transmits a temperature control value of a gravimeter temperature control system to the RAM processor. Meanwhile, the wireless transmitting end module is added to the RAM processor, and program updating or upgrading can be achieved through the wireless receiving end module. According to the invention, the linearity and precision of measurement can be improved, digitization is used for control, the debugging convenience is improved, the state solidification of a gravimeter constant temperature system is facilitated, and the method can be widely applied to various gravimeters.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, in particular to a digital high-precision temperature measurement system and method for a relative gravimeter. Background technique [0002] In the field of high-precision temperature measurement circuits of gravimeter systems, the constant-voltage Wheatstone bridge circuit method and the constant-current source drive circuit method are generally used. Among them, the Wheatstone bridge circuit method uses the bridge unbalance principle to realize temperature measurement and constant temperature control. This method has the influence of nonlinear factors, which is not conducive to the realization of high-precision temperature measurement and constant temperature control. In addition, the traditional constant voltage Wheatstone bridge circuit method generally can only realize the setting or change of the temperature control point of the constant temperature system by changing the ma...

AI Technical Summary

Problems solved by technology

Among them, the Wheatstone bridge circuit method uses the principle of unbalanced bridge to realize temperature measurement and constant temperature control. This method has the influence of nonlinear factors, which is not conducive to the realization of high-precision temperature measurement and constant temperature control.

In addition, the traditional constant-voltage Wheatstone bridge circuit method generally can only realize the setting or changing of the temperature control point of the constant temperature system by changing the matching resistance of the bridge circuit, which is not convenient for real-time debugging of the constant temperature control system

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