High-precision multi-channel platinum resistor temperature measurement module and method based on constant current source

Abstract

The invention relates to a high-precision multi-channel platinum resistor temperature measurement module and method based on a constant current source. The module is characterized by comprising a high-precision constant current source, a first nine-channel switching circuit, a plurality of temperature measuring platinum resistors, a second nine-channel switching circuit, an emitter following amplifier circuit and a microprocessor signal processing circuit; an output end of the high-precision constant-current source is respectively connected with a plurality of temperature measuring platinum resistors through the first nine-channel switching circuit and generates voltage, and the other ends of the temperature measuring platinum resistors are grounded; the input end of the second nine-channel switching circuit is respectively connected with a plurality of temperature measuring platinum resistors, the output end of the second nine-channel switching circuit is connected with the microprocessor signal processing circuit through the emitter following amplifier circuit used for buffering the generated voltage through the second nine-channel switching circuit and the emitter following amplifier circuit and then inputting the buffered voltage into the microprocessor signal processing circuit to acquire a corresponding voltage value. The module has simple circuit structure, lower hardware cost and high reliability.

Description

technical field [0001] The invention belongs to the technical field of temperature acquisition of strapdown inertial navigation equipment, and relates to a platinum resistance temperature measurement method of a fiber optic gyroscope, in particular to a high-precision multi-channel platinum resistance temperature measurement module and method based on a constant current source. Background technique [0002] Fiber optic gyroscopes and accelerometers are the core components of inertial navigation equipment, and their performance directly affects system accuracy. A major disadvantage of the fiber optic gyroscope is that the core components that constitute the fiber optic gyroscope are sensitive to temperature, and its output is significantly affected by temperature. From the measured curve, when the ambient temperature changes, the zero drift of the gyroscope is significantly increased, and the linearity of the scale factor is also seriously deteriorated. Therefore, it is nece...

AI Technical Summary

Problems solved by technology

However, the circuit structure of the existing platinum resistance temperature measurement module is complex, the hardware cost is high, and the accuracy of the collected temperature information is low, which directly affects the accuracy of the optical fiber strapdown system

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