Type of illuminometer principle and photocell illuminometer structure and use

In order to adapt to different lighting conditions, as well as the corresponding illuminance meter is used in different fields, so the illumination meter type is not only a variety of illumination meter respectively applied in different fields, choosing the proper illuminance meter, can detect wants to understand the degree of illumination, in order to adjust the intensity of illumination.



1. Visual illuminometer: inconvenient to use, low precision, rarely used;



2, photoelectric illuminometer: commonly used selenium cell illuminometer and silicon cell illuminometer;



Composition and operation requirements of photocell illuminometer:



Composition: microampere meter, gear shift knob, zero adjustment, junction pole, photovoltaic cell, v(lambda) modified filter, etc.



Commonly used selenium (se) photocell or silicon (si) photocell illuminance meter, also known as lux table. The illumination comparison table of different places is helpful for you to understand the selection of illumination meter under different circumstances in more detail.



2. Requirements:



(1) the application of linear selenium (se) cells or silicon (si) cells; It can maintain good stability and high sensitivity after working for a long time. High e when the selection of high internal resistance of the photocell, its sensitivity is low and good linearity, by strong light irradiation is not easy to damage;



(lambda) internal fu v(lambda) modified filter, suitable for use of heterochromatic temperature source of illumination, the error is small;



(3) before the photovoltaic cell plus a cosine Angle compensator (opal glass or white plastic) the reason is that the incidence Angle is large, the photovoltaic cell from the cosine rule;



(4) the illuminometer should work at room temperature or close to room temperature (cell drift changes with the temperature);