Synchronous reflection distribution photometer

Abstract

The invention discloses a synchronous reflective distribution photometer, comprising two independent bases, wherein a first pivoted arm is connected with the first base to rotate around a first rotary central line, a first optical mirror is mounted on the first pivoted arm, a second optical mirror is connected with the second base or a second pivoted arm connected with the second base, the second pivoted arm can synchronously rotate coaxially with the first pivoted arm, an optical receiver is mounted on the pivoted arm, an object light source via a lamp arm is connected with the first base to rotate around itself shaft. The invention utilizes synchronous reflection and receiving, to effectively utilize the space of dark room, reduce measurement error, while the invention arranges optical receiver at different positions to select measuring arm length easily, which effectively resolve the defects of prior arm as large area of dark room, high measuring error, and hard range adjustment or the like.

Description

technical field [0001] The invention relates to a light radiation measuring instrument, which is mainly used for the light intensity distribution or light distribution performance test of various light sources and lamps in various directions, and a synchronous reflection goniophotometer for testing the total luminous flux of light sources and lamps. Background technique [0002] The distribution of light intensity in all directions in space is an important parameter of light sources and lamps. A goniophotometer is an instrument that accurately measures the distribution of light intensity of light sources and lamps with angles. The existing large mirror goniophotometer usually has two schemes, one is the center rotating mirror goniophotometer, as shown in Figure 1, the optical mirror of this kind of scheme is at the center of rotation during measurement. , while the measured light source moves on the circle around the center of rotation of the optical mirror; the other is a c...

AI Technical Summary

Problems solved by technology

Although these two schemes are more accurate light intensity distribution measurement schemes at present, they have their own defects.

First of all, they all have the same problem: the darkroom takes up a lot of space

When the required measurement arm length (measurement distance) is large, it often takes up a considerable length of darkroom space, and the cost of implementing the test is very high.

In addition, as far as the central rotating mirror goniophotometer is concerned, the light source under test must move within a relatively large space range. Due to the inevitable existence of airflow, movement speed, acceleration and centrifugal force, it is difficult to ensure its high temperature when the light source under test is ignited. Steady state, this is a principle problem that cannot be overcome by this scheme; as far as the circular motion mirror goniophotometer is concerned, its measured light source is in a relatively static state, and can be ignited according to the natural position of the light source, and the light source is the most stable. However, in the existing method, the optical axis of the measured beam received by the horizontally placed optical receiver facing the light source under test will cause measurement errors due to oblique incidence to the optical receiver, and in order to receive the reflector in the entire circular motion The reflected light requires the optical receiver to have a larger receiving aperture, which will allow more stray light to enter the optical receiver, thereby affecting the test accuracy. In addition, when testing light sources of different sizes and beam angles, different The measurement is carried out under the measurement arm length (measurement distance), and when adjusting the measurement distance of the circular motion mirror goniophotometer, not only the position of the optical receiver is required to be adjusted, but also the angle of the receiving aperture and the reflection mirror is required to be adjusted, so that the entire measurement arm Long (measuring distance) adjustment is quite complicated, and it takes up a lot of space in the darkroom at a long measuring distance

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