An overview of photometers
A light meter is an optical test instrument that measures the intensity of artificial and natural light. Solved the problem of continuous measurement of light intensity and automatic recording. It is composed of a light detector, an automatic shifting amplifier circuit, a curve recording device, a digital printing device and an instantaneous digital display device. The curve recording device adopts optical fiber non-friction recording method, and the optical detector is composed of optical filter and blue silicon photocell, so that the visible spectrum response curve conforms to the human visual spectrum curve stipulated by the International Commission on Illumination (CIE). A pocket electronic illuminance meter belongs to the technical field of illuminance measurement and is suitable for measuring illuminance during agricultural production, daily life, and outdoor travel. It uses a photoresistor as a photoelectric conversion device, which contains a DC power supply, and is sequentially connected in series with a voltage conversion circuit, a switch, a photoresistor, a test circuit, an A/D converter, a decoder, a display driver and a display at the output end of the DC power supply. . The utility model avoids the use of a photometric head, and the DC power supply only needs a 3V battery. The decoder, the display driver and the display are integrated on an integrated circuit card, so that the structure is simple, the volume is small, it is easy to move, and it also has a sensitive response. Etc. The utility model relates to an ultraviolet radiation illuminance meter, which belongs to optical testing instruments. It is characterized by two one-way cut-off optical filters and two identical photoelectric receivers to form a dual optical path detector. The circuit part adopts dual path amplification, so that the radiation value of the required test band can be accurately measured, and the miscellaneous Astigmatism cut-off is very strong.
