Distribution photometer

Abstract

The invention discloses a distributing photometer including two independent bases, a rotary arm which rotates around a horizontal rotary central line arranged on a first base, an ellipse circumrotate plane optical reflector, a first optical detector, a second optical detector and a second laser ejector are arranged on the rotary arm and rotates around the tested lighting source with the rotary arm, the tested lighting source can rotate around the own vertical axis, a vertical round or ellipse plane optical reflector is arranged on the second base; a lighting beam from the tested lighting source is reflected to the vertical optical reflector by rotating the optical reflector, normal incidence of the lighting beam on the first optical detector is reflected by the vertical optical reflector, tests of large and medium lamps and lanterns can be implemented with long distance; the second optical detector aims at the tested lighting source directly, thus implementing tests of small lamps and lanterns of short distance. The testing chamber of the invention occupies less space with high testing precision, no extra calibration or adjusting instrument is needed in implementing tests of diverse testing arm length (testing distance) by adopting different optical detectors.

Description

technical field [0001] The invention relates to a light and radiation measuring instrument, which is a goniophotometer mainly used for testing the light intensity distribution or light distribution performance of various light sources and lamps in various directions, and the total luminous flux test of the 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. There are usually two schemes for the existing large mirror goniophotometers, one is the center rotating mirror goniophotometer (such as GO-DS series goniophotometer), such as figure 1 As shown, the goniophotometer of this type of scheme is at the center of rotation during measurement, and the light source to be measured moves on a circle around the center of rotation of...

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 light beam received by the horizontally placed optical detector facing the measured light source will cause measurement errors due to oblique incidence on the optical detector, and in order to receive the reflection mirror in the entire circular motion The reflected light requires the optical detector to have a larger receiving aperture, which will allow more stray light to enter the optical detector, 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, it is not only required to adjust the position of the optical detector, but also to adjust the angle of the receiving aperture and the reflector, 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

Images