An apd detection device for full waveform measurement lidar
A technology for measuring lasers and detection devices, used in radio wave measurement systems, instruments, etc., to ensure high linearity, improve system detection sensitivity, and filter out out-of-band noise.
Active Publication Date: 2020-04-10
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology
[0006] The technical problem solved by the technical solution of the present invention is: to overcome the deficiencies of the prior art, to provide an APD detection device for full-waveform measurement laser radar, and to solve the problem of high sensitivity and large dynamic range of received optical signals of space-borne full-waveform measurement laser radar. , High linearity detection problem, also applicable to other lidar systems and weak light signal detection occasions
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Embodiment
[0039] The present invention has been applied to a laser radar device for space-borne vegetation full waveform measurement. The laser radar performs photoelectric conversion and broadband amplification on the 1064nm wavelength laser emission and echo pulse through the APD detection device, and the amplified signal is sent to the radar signal processing. The unit's high-speed A / D performs signal acquisition and processing.
[0040] After testing, the APD detection device can perform distortion-free photoelectric conversion and broadband amplification of optical signals ranging from 10nW to 2450nW, the output signal amplitude is 8mV to 1540mV, the detection sensitivity of optical signals can reach 10nW, the module gain is 0.8MV / W, and the linear dynamic range Greater than 45dB, the test results are as follows figure 2 shown. It meets the application requirements of spaceborne vegetation full waveform measurement lidar.
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The invention discloses an APD detection device for a full-waveform measurement lidar, which comprises an APD photoelectric sensing module, a transimpedance amplifier module, a voltage amplifier module, a filter module, an adjustable high voltage module, a temperature sensing module, an interface module and a low voltage power supply module. A gain chain structure with the transimpedance amplifierand the multistage voltage amplifier cascaded is adopted, and low noise, high bandwidth and high gain current-voltage conversion and amplification on weak current outputted by the APD photoelectric sensor can be realized; the high-order Bessel filter is adopted to filter out-of-band noise, the system sensitivity is enhanced, and nonlinear distortion is not generated for the signal waveform; a bias voltage real time adjustment method is adopted, the response nonlinearity problem brought by temperature changes to the APD photoelectric sensor is overcome, and high-linearity photoelectric detection is realized. High sensitivity, high dynamics and high linearity detection requirements of light signal receiving by the full-waveform measurement lidar system can be effectively solved, and the device is also applicable to other lidar systems and weak light signal detection situations.
Description
technical field [0001] The invention relates to the technical field of laser radar, in particular to a laser radar APD detection device. Background technique [0002] Laser radar is a new type of active remote sensing instrument. Full waveform measurement laser radar uses broadband high-sensitivity detection technology to acquire and record laser detection echo signals with high fidelity, perform full digital processing and wavelet analysis, and analyze time domain, air domain, and frequency domain. Domain information, high-precision acquisition of target distance, reflectivity, roughness information and its distribution characteristics. [0003] Due to the outstanding advantages of high responsivity, fast response speed, and small size, the avalanche photodiode (APD) detector has become the first choice for laser echo reception in lidar and laser ranging systems. APD weak light signal detection technology It is one of the key technologies in the field of laser detection. I...
Claims
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IPC IPC(8): G01S7/486G01S7/487
CPCG01S7/4861G01S7/487
Inventor 时志云刘洋潘超张玉石黄辉
Owner BEIJING RES INST OF TELEMETRY