Working Principle of Spectral Lux Meters
Spectral illuminance meter is a measuring instrument that calculates illuminance and chromaticity parameters by measuring the spectral power distribution in the visible spectrum of the measured light source. This type of instrument is widely used in various on-site lighting measurement fields, as well as in the research and development of light source products, production line quality monitoring, and other aspects.
The human emitted light passes through a spectroscopic system to flatten and image light of different wavelengths onto an array photodetector, thereby forming a corresponding relationship between the pixels and wavelengths of the array detector. The spectral intensity information within the effective wavelength band can be obtained through a signal reading circuit. The main types of array photodetectors include charge coupled devices (CCD), complementary metal oxide semiconductor devices (CMOS), photodiode array devices (PDA), etc. In addition to using array photodetectors, exit slits can also be added to the spectroscopic system, and non array photodetectors combined with spectral scanning can be used to obtain spectral power distribution information. The signal readout circuit sends the original spectral power distribution information to the microprocessor, which undergoes spectral correction, illuminance and chromaticity calculations, and ultimately displays measurement results such as illuminance, chromaticity, and spectral curves.
The optical system can include cosine correctors, optical fibers, integrating spheres, necessary lenses, and other components. Spectral systems are generally based on grating devices for spectral separation, which include reflective gratings and transmissive gratings.
environmental condition
1. Temperature: (23 ± 5) ℃;
2. Relative humidity: not exceeding 85%;
3. The laboratory should be a dark room, and there should be no strong vibration or strong electromagnetic field interference indoors.
