Digital Illuminance Meter/Photometer/Illuminance Meter/Light Meter Principle
An automatically printed optical fiber illuminance meter is an optical testing instrument for measuring artificial light and natural light intensity. It solves the problem of continuous measurement of light intensity and automatic recording.
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. The astigmatism cutoff is very strong. The spectral response of the digital illuminance meter complies with the CIE standard of the International Illuminating Association. Peak lock function. Measuring range 0 to 40K Lux (0 to 40K fc). Relative value comparison function. High accuracy and fast response speed. Automatic correction function for incident light cosine angle. Reading value lock function. Automatic shutdown function in 30 minutes. Maximum and minimum value measurement functions.
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 a blue silicon photocell. The composition makes the visible spectrum response curve conform 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.
CNS5119 AA grade. As we all know, the brightness of the illuminated surface is related to the incident angle of the light source. In the same way, when measuring with a light meter, the incident angle of the sensor (Sensor) and the light source will naturally affect the reading value of the light meter. Therefore, whether a good illuminance meter has the function of cosine compensation cannot be ignored.
