RoHS Tester

 post:2015-05-21

RoHS detector is EU RoHS testing standards testing equipment. Testing Pb, Cd, Hg, Cr6 +, PBDE, PBB six hazardous substances instrument.

RoHS Tester Principle Analysis

ROHS detector is the X-ray fluorescence spectrometer, which analyzes the principle is the principle of X-ray fluorescence analysis spectrometer. X-ray fluorescence spectrometer can generally be divided into two categories, wavelength dispersive X-ray fluorescence spectrometer (WDXRF) and energy dispersive X-ray fluorescence spectrometer (EDXRF), wavelength dispersive spectrometer main components include an excitation source, analyzer crystal and goniometer, detector etc., and energy dispersive spectrometer simply excitation source and detector and associated electronics and control components, is relatively simple.

Wavelength dispersive X-ray fluorescence spectrometers analyze crystal-resolution analysis of analyte lines, according to Bragg's Law, by measuring the angle, you can get of wavelengths measured elements: nλ = 2dsinaθ (n = 1,2,3 ...) Where, λ is the wavelength spectrum analysis; d is the crystal lattice spacing; θ is the diffraction angle; n is the diffraction order. Use goniometer can measure the diffraction angle spectrum analysis, the use of the formula to calculate the corresponding wavelength element being analyzed to obtain the characteristic information measured elements.

Energy dispersive ray fluorescence spectrometer is used energy detector, by measuring the amount of charge collected by the detector, direct access to feature-ray energy emitted measured elements: Q = kE where, K is the photon energy of the incident radiation; Q is detected k for different types of energy response of the detector parameters; the corresponding amount of charge generated. The amount of charge proportional to the energy of the incident radiation, so by measuring the amount of charge available analyte feature information.

Characteristic spectral lines measured elements need to adopt certain excitation source to get. Currently excitation source conventionally used mainly ray tube and isotope excitation sources. In order to obtain qualitative and quantitative information of the sample, in addition to the spectrometer, but also must adopt certain sample preparation techniques, and the strength of the obtained spectral correlation analysis and data processing.