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热释光加热盘是配制在热释光测量仪探头部分的一个装置。将射线照射后的剂量元件放入加热盘中,经加热后释放的能量通过光电倍增管变为电信号,达到测量辐射剂量的目的。但是由于热电偶丝细脆,焊接点不是绝对牢固,因此在使用过程中,热电偶常有折断或脱落的现象。 加热盘通常用0.2mm左右厚的镍铬合金片或不锈钢片等压制而成。加热盘的背面焊有镍铬—烤铜、镍铬—镍铝或镍铬—青铜等热电偶作传感器。由于加热温度高达500C而且控制需要准确,故热电偶的焊接工艺很重要。焊接点必须焊接牢固、光滑、体积小。为解决这个问题。我们设计并试验了一种热电偶焊接的简易装置,它的基本原理结构如图1所示。
The thermoluminescent heating plate is a device that is built into the probe part of a thermoluminescence measuring instrument. The radiation dose after the dose of components into the heating plate, after heating the energy released through the photomultiplier tube into an electrical signal, to measure the purpose of radiation dose. However, due to the fine brittle thermocouple, the welding point is not absolutely solid, so in the course of the thermocouple often break or fall off phenomenon. Heating plate is usually about 0.2mm thick nickel-chromium alloy sheet or stainless steel sheet and so on. The back of the heating plate welded nickel chromium - baked copper, nickel chromium - nickel aluminum or nickel chromium - bronze and other thermocouples as sensors. As the heating temperature up to 500C and the control needs accurate, so the thermocouple welding process is very important. Solder joints must be welded firmly, smooth, small size. To solve this problem. We designed and tested a simple thermocouple welding device, its basic principle of the structure shown in Figure 1.