Explanation of the principles and the application technology of the light meter
Many people may not really understand the light meter, and may not even know its principle and its application technology. Let's take a look:
The illuminance meter is an automatically printed optical fiber and an optical testing 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 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 uses an optical fiber frictionless recording method, and the light detector is a filter and blue silicon It is composed of photovoltaic cells 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 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, and 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
The test principle of the illuminance meter: Illuminance is the surface density of the luminous flux received on the illuminated plane. An illuminance meter is an instrument used to measure the illumination on the illuminated surface. It is one of the most commonly used instruments in illumination measurement.
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.
