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A Spaceborne LiDAR Detector Calibration System

A laser radar and calibration system technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as detector performance degradation, and achieve the effect of compact structure, easy adjustment of strength, and guaranteed calibration accuracy

Active Publication Date: 2020-02-14
BEIJING RES INST OF TELEMETRY +1
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AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is to provide a spaceborne laser radar for the performance degradation of the detector caused by factors such as the external environment of the space and the life of the detector itself when the spaceborne laser radar detector operates in the space environment for a long time. Detector calibration system for calibration of detector sensitivity, linearity and time response

Method used

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  • A Spaceborne LiDAR Detector Calibration System
  • A Spaceborne LiDAR Detector Calibration System
  • A Spaceborne LiDAR Detector Calibration System

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Embodiment Construction

[0020] A device for calibrating the sensitivity and linearity of spaceborne lidar detectors using an integrating sphere such as figure 1 As shown, the device for calibrating the time response of the spaceborne lidar detector using ns-level narrow linewidth laser is as follows figure 2 shown.

[0021] The above calibration process is described in detail as follows:

[0022] ●Use the integrating sphere to calibrate the sensitivity and linearity of the spaceborne lidar detector

[0023] Sensitivity is an important index to measure the detector's limit detection ability for weak signals, defined as the lowest detectable optical power. Detector sensitivity is mainly determined by the responsivity and noise of the detector. The higher the responsivity or the lower the noise, the higher the sensitivity of the detector. Since the noise of the detector is related to the bandwidth, the detector should work in the working bandwidth of the lidar system when the sensitivity is calibrat...

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Abstract

Provided is a space-borne laser radar detector calibration system used for realizing calibration of the sensitivity, the linearity and the time response of detectors. The light emitted by an LED with low intensity, stable operation, and easy intensity adjustment is converted to the light irrelevant to the angle by employing an integrating sphere, the light irrelevant to the angle in the integrating sphere is coupled to an optical fiber through a coupling lens, the light in the optical fiber forms a collimated light which is easy for optical path construction through a collimating mirror, the collimated light is spitted by employing a fiber splitter, attenuated, and introduced to each detector, and the calibration of the sensitivity and the linearity is realized; and the calibration of the time response of the detectors requires a light source with ultrafast response time, a laser can generate narrow pulse with the ns-level width, time response information of the detectors can be conveniently extracted by employing the laser for generating the ns level, and the calibration of the time response is realized.

Description

technical field [0001] The invention relates to a calibration system of a spaceborne laser radar detector, which is suitable for calibrating the sensitivity, linearity and time response of the spaceborne laser radar detector. Background technique [0002] The detector is an optoelectronic device that converts the optical signal to be measured into an electrical signal. It plays a very important role in the lidar system. When building the lidar system, the detector used must be calibrated. When the lidar is used, the detector operates in the space environment for a long time. Due to the influence of factors such as the external environment of the space and the life of the detector itself, the performance of the detector will decline, and regular calibration must also be performed. For detectors used on lidar, parameters such as sensitivity, linearity and time response need to be calibrated. Contents of the invention [0003] The technical problem solved by the present inve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/497
CPCG01S7/497
Inventor 梅艳鹏赵一鸣潘超
Owner BEIJING RES INST OF TELEMETRY
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