Illuminance meter principle, use and function
An automatically printed optical fiber illuminance meter is an optical testing instrument for measuring the intensity of artificial light 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 an 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 stipulated by the International Commission on Illumination (CIE). The pocket electronic illuminance meter belongs to the technical field of illumination measurement and is suitable for measuring illumination in agricultural production, daily life, and outdoor travel. It uses a photoresistor as a photoelectric conversion device. It contains a DC power supply, a voltage conversion circuit, a switch, a photoresistor, a test circuit, an A/D converter, a decoder, a display driver and a display connected in series to the output end of the DC power supply. . The utility model avoids the use of a photometric head, and only uses a 3V battery for DC power supply. The decoder, display driver and display are integrated on an integrated circuit card, making it simple in structure, small in size, easy to move, and responsive. Etc. An ultraviolet radiation illuminance meter belongs to an optical testing instrument. It is characterized by a dual-optical path detector composed of two unidirectional cut-off optical filters and two identical photoelectric receivers. The circuit part adopts dual-path amplification, so that the radiation value of the required test band can be accurately measured. Very strong astigmatism cutoff
Illumination test principle
Illumination is the area density of luminous flux received on the illuminated plane. An illuminance meter is an instrument used to measure the illumination on an illuminated surface. It is one of the most commonly used instruments in illumination measurement.
The structural principle of the illuminance meter
The illuminance meter consists of two parts: a photometric head (also called a light-receiving probe, including a receiver, a V (λ) pair filter, and a cosine corrector) and a reading display.
