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Spectral incident light path structure of direct reading spectrometer
Release time: 2020-01-10 11:03:14 Click: 468
Direct reading spectrometer incident light path
The incident light path of the direct-reading spectrometer refers to that the spectrometer in the exposure phase, all the spectral luminous fluxes excited by the light source are incident on the concave grating in the optical room. 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, the incident light path transmits the light generated from the mercury lamp into the grating to generate Hg spectral lines (Hg line 253 , 6nm) . The photocurrent signal output by the photomultiplier tube is then amplified by an amplifier and indicated by a 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 uses a focusing lens to direct the entrance slit to reach the spectroscopic system of the concave grating, the adjustment of the entrance slit is not performed by the Hg line , but the element slit (usually the base 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 role 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 reflection ability of the elements below 200nm of ultraviolet light , the surface of the concave mirror needs to be coated with magnesium fluoride, and the entrance slit and the spherical mirror are installed in a vacuum chamber.
There are two mirrors in the optical path. One of them is to make the mirror enter the optical path when the right sample stage excites the sample, and the mercury lamp mirror exits the optical path to reflect the excitation light onto the spherical mirror. Then it enters the entrance slit and reaches the concave grating to split the light.
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 rack excites the sample, it enters the exposure stage. The Hg mirror will exit the optical path, so that the left sample rack excitation light is introduced into the spherical mirror and enters the entrance slit to the concave The grating performs spectral 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。 This is a fatal problem for short UV elements ( C , P , S , As , B , Sn, etc.). 200nm 以下波段的辐射吸收掉。 The presence of oxygen, air, and water vapor in this region absorbs radiation below 200 nm . Photoelectric direct reading spectrometers 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 the absorption is most intense near 140 nm .
Imagination direct-reading spectrometer has re-developed a new optical path structure, so that the content of argon is reduced, and a vacuum pump is used to save the consumption of argon. Generally, one can of argon can be used for 5-6 days. After adopting this structure, the use of argon gas was greatly reduced, and the above-mentioned fatal problem was solved.