APD (Angular position digitizer) voltage and temperature curve testing device and use method thereof

Abstract

The invention discloses an APD voltage and temperature curve testing device and a use method thereof. The device mainly comprises a computer, an MCU (Microcontroller Unit), a DAC (Digital-to-Analog Converter), an ADC (Analog-to-Digital Converter), an APD power supply, a current and voltage converter, a temperature sensor, an angular position digitizer, an adjustable thermostat and a light source. The invention realizes automatic accurate test on the basis of the MCU and meanwhile has the advantages of simple circuit, low cost, safety, reliability and the like, thereby being suitable for testing APD voltage and temperature curves in multiple fields of communication, optical fiber sensing and the like.

Description

Technical field [0001] The invention relates to an APD (Avalanche Photodiode) voltage temperature curve test device and a use method thereof, in particular to an automatic test device based on a single-chip microcomputer that can accurately test the APD voltage temperature curve. Background technique [0002] APD is a sensor made of the photoconductivity effect of semiconductor materials. APD has the characteristics of high gain, high sensitivity, etc., and has a wide range of applications in various fields of military and national economy. For example, in the fields of optical communications, industrial automatic control, photometric measurement, and fiber optic sensing. [0003] APD is very sensitive to temperature. Various electrical parameters of APD change with the change of ambient temperature. Among them, the parameters that change the most are breakdown voltage and gain. When the temperature increases, the breakdown voltage of the APD increases, and when the temperature d...

AI Technical Summary

Problems solved by technology

Due to the large discreteness of APD devices, their breakdown voltage and voltage-temperature curves are quite different. Manufacturers generally provide the breakdown voltage at each APD reference temperature (usually at 25°C) and the operating voltage for a specific gain. , but the temperature coefficient will only provide a typical value, which is not suitable for every APD, and the temperature coefficient varies greatly at different temperatures, so it is very important to accurately measure the curve of APD voltage versus temperature when the gain is the same, but there is a lack of in the prior art Effective means of automatic and accurate measurement

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