Mr. Yuqiang Wang Profile

Yuqiang Wang

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Proceedings Article | 4 December 2024 Paper

Research on multi-axis and MTF testing methods for laser rangefinder system in vacuum environment

Yuqiang Wang, Zonyao Ou

Proceedings Volume 13283, 132835K (2024) https://doi.org/10.1117/12.3040376

KEYWORDS: Collimators, Cameras, Modulation transfer functions, Imaging systems, Laser systems engineering, Charge-coupled devices, Vacuum, Mirrors, Wavefront errors, Transmitters

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There are significant differences between the environment of the laser rangefinder system during in orbit operation and ground installation. The system is easily affected by temperature, vibration, and air pressure during in orbit operation, which in turn affects the suability and imaging quality of the remote sensor. It is necessary to place the laser rangefinder system in vacuum environment and test its stability. The key indicators of laser rangefinder system are multi-axis consistency and modulation transfer function(MTF). Multi-axis consistency refers to whether the optical axes of the laser transmitter, laser reciving system, and camera are parallel. MTF characterizes the imaging quality of the camera. Testing multi-axis consistency and MTF simultaneously in a vacuum environment is a huge challenge, and there is mutual interference between systems. Only multi-axis consistency or camera MTF can be tested separately, and the testing coverage is incomplete, requiring repeated entry and exit of the vacuum tank for testing. A new method of conjugate optical path is proposed to address thin challenge. The target surface of MTF is conjugated with the focal plane of the multi-axis consistency through high-precision calibration, and placed on the focal plane of the parallel light tube. A reflector is set in the conjugated optical path, and the mirror is moved in and out through the method of structural reference positioning, which can achieve simultaneous measurement of multi-axis and MTF under different working conditions. Greatly improving the testing efficiency of laser rangefinder system in vacuum environment.

Proceedings Article | 8 November 2024 Paper

Design of timing control circuit for infrared detector based on JESD204B

Renkai Chen, Hua Wang, Yuqiang Wang, Dong Yu, Xinchuan You

Proceedings Volume 13247, 1324709 (2024) https://doi.org/10.1117/12.3035981

KEYWORDS: Infrared detectors, Clocks, Data transmission, Field programmable gate arrays, Design

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In this paper, a timing control circuit for infrared detectors is designed based on JESD204B high-speed serial interface technology, and a corresponding verification scheme is proposed. The timing control circuit of the infrared detector consists of a JESD204B high-speed data transmission module and a control clock generation module, used for data transmission and control timing generation in the infrared detector imaging circuit. The timing generation module can adjust the register status through SPI to meet the timing requirements of multiple detectors; The data transmission module outputs high-speed serial data through two JESD204B transmission interfaces for 8-channel LVDS digital data according to the protocol, reducing the data interface with the main control circuit. The high-speed data transmission function is verified using a timing control circuit as the transmitter and FPGA as the receiver. The FPGA received the data correctly and met a serial data transmission rate of 4.096Gbps; Verified the function of controlling timing generation, the timing control circuit is based on the main clock and can correctly generate control signals for various modules inside the circuit.

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