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在JY38型ICP光谱仪中,光栅与波长指示器之间用钢丝绳相连接,以实现光栅位置与波长指示同步。长期工作会出现钢丝绳断或紧固螺丝松动现象,导致光栅位置与波长指示失调,为此必须重调光栅位置与波长。本文介绍分析人员自已动手进行调整的方法。 1 在动手调整前首先应了解仪器的光学系统 JY38型ICP光谱仪的光学系统见图1。 光源O发出的光从入射狭缝S_1照射到准直镜M_1,由M_1准直后平行投射到光栅G。经光栅c色散后投射到聚焦物镜M_2,再经在光谱焦面上的出射狭缝S_2照射到光电倍增管E上。改变光栅G的角度就可使不同波长的光依次照射到光电倍增管上实现光电转换。 此光学系统光栅的零级光谱为很强的未经分光的“零级线”白光。在正常情况下,当零级线照射到光电倍增管时,有很强的强度,获得最大强度时光栅所处的位置,应与波长指示器的0.000nm波长同步。
In the JY38 ICP spectrometer, grating and wavelength indicator connected with a rope between the grating position and the wavelength indicator to achieve synchronization. Long-term work there will be loose wire rope or fastening screws, leading to grating position and wavelength indicator disorders, for which the grating position and wavelength must be re-readjusted. This article describes how analysts make their own adjustments. 1 The first thing you should know about the optical system of the instrument before starting the adjustment The optical system of the JY38 ICP spectrometer is shown in Figure 1. The light emitted by the light source O is irradiated to the collimating mirror M_1 from the incident slit S_1 and collimated by M_1 and then projected to the grating G in parallel. The grating C is dispersed and then projected onto the focusing lens M_2, and then irradiated onto the photomultiplier tube E through the exit slit S_2 on the focal plane of the spectrum. Changing the angle of the grating G enables the different wavelengths of light to sequentially irradiate the photomultiplier tubes for photoelectric conversion. The zero-order spectrum of this optical system grating is a strong, unsprased “zero-order line” of white light. Under normal conditions, when the zero-level line is irradiated to the photomultiplier tube, there is a strong intensity. When the maximum intensity is obtained, the position of the grating should be synchronized with the wavelength indicator’s wavelength of 0.000 nm.