What are the basic structures of spectral analysis instruments?
A device for converting an optical signal into an electrical signal. Ultraviolet visible absorption common photoelectric cell, photoelectric tube, photomultiplier tube and photodiode array detector. Infrared absorption commonly used thermocouple, high Lai trough and resistance bolometer.
Signal processing and display system signal processing, including signal amplification, mathematical calculation and conversion, etc.. The display system includes electric meter display, digital display, fluorescent screen display, result printing and so on.
A vessel or device used to hold a sample to be tested. Ultraviolet absorption is commonly used in quartz cells, visible molecular absorption is commonly used in glass pools, infrared absorption molecules are made of rock salt materials, liquid pools, gas pools, and solid bodies; atomic absorption is used as an atomization device.
The monochromator continuous light by wavelength dispersive order, and separating the device from the width of the zone. In general, by a grating or prism monochromator slit, the collimating mirror is composed of three parts.
A device that provides a continuous spectrum or line spectrum with a high intensity, stability, and small luminous area. The UV light absorption spectrophotometer are commonly used in hydrogen and deuterium lamp light, visible light absorption spectrophotometer used a tungsten lamp and halogen lamp, infrared light absorption spectrophotometer are commonly used silicon carbide, the Nernst lamp light source; atomic absorption spectrophotometer are used hollow cathode lamp.
