Method and device for calibrating absolute spectral response of photoelectric detector

Abstract

The invention discloses a method and device for calibrating absolute spectral response of a photoelectric detector, relating to the test of photoelectric detectors. The device is provided with a grating spectrometer, a photoelectric acquiring circuit, a computer, a to-be-tested photoelectric detector, a standard spectral irradiance probe, a sleeve, a convergent lens set, a light source, an LED (Light Emitting Diode) temperature controlled clamp and an LED current stabilizing source, wherein the relative spectral response of the to-be-tested photoelectric detector is measured to obtain a relative spectral response curve, the probe and the light source are fixed in the sleeve, an LED is turned on and a clamp is opened, spectral irradiance distributions of the LED under different currents are measured, the probe is removed, the to-be-tested photoelectric detector is fixed in the sleeve, response current values of the to-be-tested photoelectric detector under illumination of different wavelengths are acquired by the photoelectric acquiring current and are sent to the computer; and the absolute spectral response of the to-be-tested photoelectric detector can be figured out by using the relative spectral response and the response current of the to-be-tested photoelectric detector under the illumination of the LED light source. Finally, a response-wavelength curve is drawn.

Description

technical field [0001] The invention relates to the test of photodetectors, in particular to a calibration method for the absolute spectral response test of photodetectors. Background technique [0002] Photodetectors are photoelectric conversion devices. In spectral measurement, the spectral characteristics of photodetectors are an important basis for device selection. Therefore, photodetector spectral response testing has a good application prospect in the fields of production, detection and application of photodetectors. . Responsivity is the most important performance parameter of a photodetector, and it is also one of the important basis for calculating other parameters. There are two types of spectral responsivity of photodetectors: absolute and relative. Absolute spectral responsivity R Φ (λ) refers to the ratio of the current output by the photodetector to the radiant flux it receives at a specific wavelength λ: [0003] R Φ ...

AI Technical Summary

Problems solved by technology

However, the incident spot of the radiation field is often not focused to a small size due to aberrations and other reasons, and the absolute spectral radiant flux responsivity R is directly measured. Φ (λ) It is more difficult for photodetectors with small photosensitive area; for photodetectors with infrared band, it is more difficult to focus; and for photodetectors with amplification function, due to the large laser power, saturation is prone to occur

On the other hand, the uniformity of monochromatic light and the match between the spot size and the standard detector will further cause test errors

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