A light meter is an optical test instrument that measures the intensity of artificial light and natural light. Solve the problem of continuous measurement of light intensity and automatic recording. It is composed of a photodetector, an automatic shift amplifying circuit, a curve recording device, a digital printing device and an instantaneous digital display device. The curve recording device adopts the optical fiber frictionless recording method, and the photodetector is composed of a filter and a blue silicon photocell, so that the visible spectrum response curve conforms to the human visual spectrum curve specified by the International Commission on Illumination (CIE). The pocket electronic illuminance meter belongs to the technical field of illuminance measurement, and is suitable for measuring illuminance in agricultural production, daily life and outdoor travel. It uses a photoresistor as a photoelectric conversion device, it 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 an optical head, the DC power supply only needs a 3V battery, and 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, the movement is convenient, and the response is sensitive. Etc. An ultraviolet radiation illuminometer belongs to an optical testing instrument. It is characterized in that it is composed of two one-way cut-off optical filters and two identical photoelectric receivers to form a dual-optical path detector. The astigmatism cutoff is very strong
