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Structure of the spectrum incident light path of direct reading spectrometer
Release time: 2020-01-10 11:03:14 Click: 767
Direct reading spectrometer incident light path
The incident light path of the direct-reading spectrometer refers to that the spectrometer emits all the spectral luminous flux after being excited by the light source onto the concave grating in the optical chamber during the exposure stage. Hg 的谱线（汞线 253 ， 6nm) ，由光电倍增管输出光电流信号再经过放大器放大，用微安表指示出来 。 During the scanning of the concave grating slit, the incident light path conveys the light generated from the mercury lamp into the grating to produce the Hg spectral line (mercury line 253 , 6nm) . The photocurrent signal output by the photomultiplier tube is amplified by the amplifier and indicated by the microamp meter Come out . Hg 线进行入射狭缝调整，而是采用元素扫描（通常选择基体元素）来校准入射狭缝。 When the optical path adopts a focusing lens to directly enter the entrance slit to the spectroscopic system of the concave grating, the entrance slit is not adjusted by Hg line , but the element scan (usually the matrix element is selected) is used to calibrate the entrance slit.
Incident light path structure
25m 宽）之外还有球面反射镜。 In addition to the entrance slit ( 25m wide), the incident light path also has a spherical mirror. 入射狭缝。 Its function is to reflect all the spectral brightness excited on the two sample stages to the entrance slit. 200nm 以下元素的反射能力，凹面反射镜表面需涂氟化镁，入射狭缝和球面反射镜装在真空室内。 In order to improve the reflectivity of elements below 200nm of ultraviolet light , the surface of the concave mirror needs to be coated with magnesium fluoride, and the entrance slit and spherical mirror are installed in the vacuum chamber.
There are two mirrors in the optical path, one of which is to make the mirror enter the optical path when the sample is excited on the right sample stage, and the mercury lamp mirror exits the optical path to reflect the excitation light brightly onto the spherical mirror. Then enter the entrance slit to reach the concave grating beam splitting.
Mobile direct reading spectrometer
入曝光阶段， Hg 反射镜将退出光路，使左样品架激发光引入球面反射镜，进入入射狭缝到达凹面光栅进行分光。 The Hg mirror is used for slit scanning. When the left sample holder excites the sample, it enters the exposure stage, the Hg mirror will exit the optical path, and the left sample holder excitation light will be introduced into the spherical mirror, enter the entrance slit and reach the concave surface The grating performs beam splitting.
The two mirror regions in the optical path are in a non-vacuum state. C 、 P 、 S 、 As 、 B 、 Sn 等等）这是一个致命的问题。 For short ultraviolet elements ( C , P , S , As , B , Sn, etc.) this is a fatal problem. 200nm 以下波段的辐射吸收掉。 Oxygen, air, and water vapor exist in this area to absorb radiation below 200 nm . The photoelectric direct reading spectrometer cannot analyze the content of these elements. 130 ～ 195nm 的辐射都有吸收，而在 140nm 附近吸收最激烈。 Oxygen absorbs radiation from 130 to 195 nm , and absorption is most intense near 140 nm .
Chuangxiang direct-reading spectrometer has re-developed a new optical path structure to reduce the amount of argon used, and use a vacuum pump to save argon consumption. Generally, a can of argon can be used for 5-6 days. After adopting this structure, the use of argon gas is greatly reduced, and the above-mentioned fatal problems are solved.