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Distribution photometric measurement method and distribution photometric measurement system based on phase-locked amplifier

A lock-in amplifier and photometric measurement technology, applied in the field of measurement, can solve the problems of systematic errors of light intensity data, large measurement uncertainty, and defects of linear response of light intensity, etc. Effect

Inactive Publication Date: 2016-12-14
HANGZHOU QUALITY TECH SUPERVISION INSPECTION INST
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Problems solved by technology

However, when the existing goniophotometers measure light intensity data, the photodetectors used have defects in the linear response to light intensity; especially when measuring weak light sources, rapid switching between strong and weak light, and noise interference, the measurement is uncertain. The intensity is very large, and the light intensity data is prone to systematic errors

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  • Distribution photometric measurement method and distribution photometric measurement system based on phase-locked amplifier
  • Distribution photometric measurement method and distribution photometric measurement system based on phase-locked amplifier
  • Distribution photometric measurement method and distribution photometric measurement system based on phase-locked amplifier

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Embodiment Construction

[0025] Further description will be given below in conjunction with the embodiments shown in the accompanying drawings.

[0026] The lock-in amplifier is a weak signal phase-sensitive detection device based on correlation detection technology. Correlation detection is a narrow-band processing method for frequency domain signals, and it is a correlation measurement of the integration process. It uses the correlation characteristics between the signal and the external signal to eliminate the interference of the noise signal without correlation, so as to achieve the purpose of accurately picking up and detecting the weak signal under test in the noise signal.

[0027] A goniophotometric test system using a lock-in amplifier consists of the following parts:

[0028] The host of the goniophotometer has double free turntables and an aperture 5, the photodetector is used to detect light signals, and the computer 11 is used to process the detection signals; these are similar to the ex...

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Abstract

The invention relates to a distribution photometric measurement method and a distribution photometric measurement system based on a phase-locked amplifier. The provided measurement method can be used to eliminate noise signal interference, and the provided measurement system has the characteristic of simple structure. According to the technical scheme, the distribution photometric measurement method based on a phase-locked amplifier comprises the steps as follows: (1) a light chopper is placed; (2) a photoelectric detector is connected to a phase-locked amplifier; (3) the phase-locked amplifier is connected to a computer; (4) a measured sample is placed and fixed in a to-be-measured station of a distribution photometer; (5) the devices go into a work state; (6) the spindle of the distribution photometer rotates; (7) a weak light signal is detected from noise; (8) the distribution photometer runs in real time by controlling a double-degree-of-freedom turntable; and (9) the flux is calculated. The distribution photometric measurement system based on a phase-locked amplifier comprises a distribution photometer host, a photoelectric detector, and a computer. The front end of the photoelectric detector is equipped with a light chopper, and the light chopper is connected to a modulator. The system is further configured with a phase-locked amplifier.

Description

technical field [0001] The invention relates to a measurement method and system, in particular to a distribution photometric measurement method and a measurement system. Background technique [0002] The goniophotometer is the main equipment for testing the light intensity distribution of various lamps and light sources. The device rotates synchronously with the sample through the swing arm, and the photodetector receives the luminous intensity of the measured light source point by point in different directions, and calculates the spatial distribution data of the light intensity. However, when the existing goniophotometers measure light intensity data, the photodetectors used have defects in the linear response to light intensity; especially when measuring weak light sources, rapid switching between strong and weak light, and noise interference, the measurement is uncertain. The intensity is very large, and the light intensity data is prone to systematic errors. This is an...

Claims

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Application Information

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IPC IPC(8): G01J1/42G01J1/02
CPCG01J1/42G01J1/0295G01J2001/4247
Inventor 朱腾飞钱枫汪哲弘慎月强蔡怡
Owner HANGZHOU QUALITY TECH SUPERVISION INSPECTION INST
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