Distribution photometer

Abstract

The invention discloses a distribution photometer. It includes two independent bases, the optical reflector is installed on one end of the rotating arm connected with the first base, the other end of the rotating arm is installed the first optical receiver facing the light source under test, and the rotating arm drives the optical reflecting mirror and the first The optical receiver rotates around the first rotation center line; the second optical receiver is installed on the second base, and can rotate around the first rotation center line synchronously with the rotating arm, and the synchronous reception is reflected by the optical mirror from the measuring light source light beam; the measured light source is connected to the first base through the lamp arm, and rotates around its own axis. The light source under test in the present invention is always in a stable and natural ignition state, and by synchronously receiving the beam of the light source under test, the measurement error is effectively reduced and the measurement accuracy is improved; by setting two optical receivers, it can be conveniently realized without adjusting the optical reflector Two measuring arm lengths.

Description

【Technical field】 [0001] The invention relates to a photometric measuring instrument, which is mainly used for testing the light intensity distribution (or light distribution performance) in various directions of various indoor lamps, road lamps and flood lamps, and testing the total luminous flux of light sources and lamps. 【Background technique】 [0002] Existing circular motion mirror goniophotometers such as figure 1 As shown, during the test, the light source under test is fixed on the test seat, and the light source under test is rotated around the vertical axis. At the same time, the optical mirror rotates around the horizontal axis around the light source under test, and the detection device receives the reflected light from the mirror. Light, so as to measure the light distribution performance of the light source under test. [0003] The current circular motion mirror goniophotometer has the problem of troublesome adjustment of the measurement distance (measurement...

AI Technical Summary

Problems solved by technology

In order to eliminate stray light, in the darkroom (or dark box) of the goniophotometer test, a bucket-shaped light-absorbing cavity and a diaphragm are arranged on the front side of the optical receiver. Due to the rotation of the optical mirror, the opening of the diaphragm is required to be relatively large, so more The stray light will also be reflected to the light-receiving surface of the detector through the wall, the ground, the main body of the goniophotometer, etc., thereby affecting the test accuracy; The light-absorbing cavity needs a fixing device, which also partially blocks the signal light and affects the test accuracy

Alignment and positioning of the luminaire under test is also inconvenient

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