The light intensity measuring instrument is mainly used in those aspects. The light meter is a kind of automatic printing optical fiber. It is an optical test instrument for measuring the intensity of artificial light and natural light. It solves 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. It is composed of photovoltaic cells so that the visible spectral response curve conforms to the human visual spectral curve specified by the Commission on Illumination (CIE). The portable 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, and it contains a DC power supply, which is serially connected to 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 SO 200K light intensity measuring instrument avoids the use of optical head, the DC power supply only needs a 9VBlock battery, and the decoder, display driver and display are integrated on an integrated circuit card, making it simple in structure, small in size, and easy to move. It has the advantages of responsiveness and so on. 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, and the circuit part adopts dual path amplification, so that the radiation value of the required test band can be accurately measured. Test principle of illuminometer with strong astigmatism cut-off: Illuminance is the areal density of the luminous flux received on the illuminated plane. The illuminometer is an instrument used to measure the illuminance on the illuminated surface, and it is one of the most used instruments in illuminance measurement. The structure principle of the illuminance meter: The illuminance meter is composed of two parts: the luminous head (also known as the light-receiving probe, including the receiver, the V(λ) pair filter, and the cosine corrector) and the reading display
