Harbin Institute of Technology

Ziqi Yin

PengCheng Hu

Hongxing Yang

Jiubin Tan

Yan Wang

Ruitao Yang

Yun Zou

Shiyuan Lin

Jing Li

A differential proportional temperature measurement circuit and method based on bidirectional constant voltage drive is proposed. The circuit and method applied to the precision temperature measurement of spacecraft, the main components include a bidirectional constant voltage source proportional bridge circuit, a differential and single-ended amplifier circuit, an analog-to-digital conversion circuit, a digital filter circuit, a data processing circuit and an isolated filter power supply circuit. The method adopts the bidirectional constant voltage drive technology, and enlarges and measures the difference between the voltage values of the reference resistor and the resistance to be measured by improving the sensing bridge of the ordinary commutation proportional method, and suppresses the long-term drift of the excitation unit and the voltage measurement unit. The method can meet the requirements of temperature measurement resolution of μK magnitude and the power spectral density of μK/Hz(0.1 mHz-1 Hz) magnitude in aerospace temperature measurement systems.

Differential proportional temperature measurement circuit and method based on bidirectional constant voltage drive

The present disclosure provides a multi-frequency hybrid heterodyne laser tracker system based on a single light source. According to the laser tracking system proposed in the present disclosure, multi-frequency laser is obtained by conducting multi-acousto-optic frequency shift on a dual-longitudinal-mode laser unit, and an absolute ranging precision gauge is constructed by using a dual-longitudinal-mode interval of a light source. With the frequency shift difference of a multi-acousto-optic frequency shifter, an absolute ranging roughness gauge is constructed, and the relative displacement measurement of dual-frequency light interference is achieved. Meanwhile, by utilizing the reflection of multiple reflectors and light splitting and combining of polarization prisms, synchronous measurement of multi-wavelength absolute distance, relative displacement and PSD position is achieved, resolving the problem that an existing laser tracker uses multiple light sources, which leads to difference in measurement datum, and consequently to the difficultly in traceback.

Multi-frequency hybrid heterodyne laser tracker system based on single light source

The disclosure provides a high-frequency-reproducibility laser frequency stabilization method and device based on multi-point acquisition of laser tube temperature. The laser frequency stabilization device includes: a frequency stabilization control circuit. The frequency stabilization control circuit includes a polarizing beam splitter, an optical power conversion circuit, an A/D conversion circuit, a temperature measuring circuit, a microprocessor, a D/A converter and a heating film driver. The polarizing beam splitter is disposed outside any one of laser transmitting holes. The optical power conversion circuit is disposed on reflection and refraction optical paths of the polarizing beam splitter. The optical power conversion circuit, the A/D conversion circuit, the microprocessor, the D/A converter, the heating film driver and a plurality of groups of heating films are sequentially in one-way connection. Temperature sensors, the temperature measuring circuit and the microprocessor are sequentially in one-way connection.

High-frequency-reproducibility laser frequency stabilization method and device based on multi-point acquisition of laser tube temperature

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Harbin, China

Ziqi Yin