Linshang Technology is a company that manufactures inspection instruments. Its representative products include gloss meter, coating thickness gauge, UV light meter and UV energy meter, solar film transmission meter, optical density meter, light transmittance meter and other products. In the above products, we often see the value of "λp" in its parameter table. Some customers will not know what λp means. Here we will introduce you in detail.
Sunlight is mainly divided into visible light and invisible light. Visible light is divided into red, orange, yellow, green, cyan, blue and purple. The seven lights are concentrated into white light, invisible light includes rays and infrared rays. Different colors of light have different wavelength bands.
Among the Linshang instruments, UV light meter, UV energy meter, and solar film transmission meter are all light energy measuring instruments. The main application here is related knowledge of visible light, ultraviolet and infrared.
In fact, the wavelength is mainly divided into λp and λd, that is, the peak wavelength and the dominant wavelength. The peak wavelength is the wavelength corresponding to the maximum luminous intensity. It is a pure physical quantity and is generally applied to the detection of monochromatic light with a symmetrical waveform. For example, the Linshang LS120 UV energy meter is mainly used for the detection of ultraviolet energy. Its spectral response range is 315nm-400 nm and the peak wavelength is 365nm. The spectral response diagram is as follows:
The dominant wavelength refers to the wavelength at which the eye can see the main light and color emitted by the light source. Generally, what we see is not a single wavelength of light, but a combination of many wavelengths of light. The light energy at one wavelength is larger than the light energy at other wavelengths. This wavelength is the peak wavelength λp of the beam. The light wavelength distribution is not necessarily symmetrical. As a result of the combined effect of various wavelengths felt by our human eyes, any color can be regarded as a color that is mixed with a reference light source at a certain ratio and matched with a certain spectral color. This spectral color is the dominant wavelength λd of the color. We believe that you will not be so confused again when you meet the "λp" value on the UV light meter or UV energy meter parameter table again after the above detailed introduction.