Principle of Digital Illuminance Meter / Photometer / Intensity Meter / Light Meter
A kind of automatic printing fiber optic illuminance meter, is a kind of optical test instrument to measure the intensity of artificial light and natural light. Solves the problem of continuous measurement of light intensity and automatic recording.
A kind of ultraviolet radiation illuminance meter, belongs to the optical test instrument. Characterized by two one-way cut-off optical filters and two identical photoelectric receiver constitutes a dual optical path detector, the circuit part of the double amplification, so that it can accurately measure the radiation value of the required test band, stray light cut-off is very strong. The spectral response of the digital illuminance meter is in line with the International Illuminating Association CIE standard. Peak lock function. Measurement range 0 to 40K Lux (0 to 40K fc). Relative value comparison function. High accuracy and fast response time. Incident light cosine angle auto-correction function. Reading lock function. 30-minute automatic shutdown function. Maximum and minimum value measurement function.
It is composed of photo detector, automatic shift amplification circuit, curve recording device, digital printing device and instantaneous digital display device. Which curve recording device using optical fiber frictionless recording mode, light detector for the filter and Lan silicon photocell composition, so that the visible spectral response curve in line with the International Commission on Illumination (CIE) stipulated by the human eye visual spectral curve.
Pocket electronic illuminance meter belongs to a kind of illuminance measurement technology field, suitable for agricultural production, daily life, outdoor travel when measuring illuminance. It adopts a photoresistor as a photoelectric conversion device, and 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, all connected in series in turn to the output of said DC power supply. The utility model avoids the use of a photometric head, the DC power supply can be used only with 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 it also has the advantages of being responsive and so on.
CNS5119 Class AA. As we all know, the brightness of the illuminated surface is related to the angle of incidence of the light source. By the same token, when using a luxmeter to make measurements, the angle of incidence between the sensor and the light source will naturally have an effect on the reading of the luxmeter. Therefore, a good illuminance meter has a cosine compensation function should not be ignored.
