Principles of Digital Luxmeter/Intensity Meter/Light Quantity Meter
An automatic printing optical fiber illuminance meter is 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.
The utility model relates to an ultraviolet radiation illuminance meter, which belongs to optical testing instruments. It is characterized by two one-way cut-off optical filters and two identical photoelectric receivers to form a dual optical path detector. The circuit part adopts dual path amplification, so that the radiation value of the required test band can be accurately measured, and the miscellaneous The astigmatism cut-off is very strong. The spectral response of the digital illuminance meter conforms to the CIE standard of the International Association of Lighting. Peak lock function. Measurement range 0 to 40K Lux (0 to 40K fc). Relative value comparison function. High accuracy and fast response. Incident light cosine angle automatic correction function. Read lock function. 30 minutes automatic shutdown function. Maximum and minimum measurement functions.
It is composed of a photodetector, an automatic gear shifting amplifier 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 a filter and a blue silicon photocell. Composition, so that the visible spectral response curve conforms to the human visual spectrum curve stipulated by the International Commission on Illumination (CIE).
A pocket electronic illuminance meter belongs to the technical field of illuminance measurement and is suitable for measuring illuminance during agricultural production, daily life, and outdoor travel. It uses a photoresistor as a photoelectric conversion device, which 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 a photometric head, and the DC power supply only needs a 3V battery. The decoder, the display driver and the display are integrated on an integrated circuit card, which makes it simple in structure, small in size, easy to move, and sensitive in response. Etc.
CNS5119 Class AA. We all know that 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 between 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.
