TEMPERATURE CONTROLLED CHAMBER FOR X-RAY DIFFRACTION SPECIMENS

原型室是由聚碳酸酯和铝建造的，具有 铍窗口，以允许X射线束进入。包含以下内容的单元格 标本被装进窗户旁边的支架中。的底部 保持器与帕尔蒂埃固态热的一侧保持接触 打气筒。热泵的相对一侧被夹紧在铝材上 用作散热片的腔体底部。在这么早的时候 版本中，使用热敏电阻来控制热泵，以保持 在设定的温度下进行取样。膜板安装在 一个可调节的滑块上的腔室。基于这个原型的成功， 还要求增加两个不同焦距的暗室。新的 机组的设计采用了改进的温度控制器。新单位 将线性反馈传感器与双极电源相结合，以允许 自动从制冷切换到加热。设定的温度是固定的 通过3位指轮开关，样品温度在一个 3个1/2位数字显示。这套新系统可以保持样品的温度 在-3摄氏度到85摄氏度之间，稳定性为0.02摄氏度。

A prototype chamber was constructed of polycarbonate and aluminum with a beryllium window to allow the entry of the x-ray beam. The cell containing the specimen is loaded into a holder next to the window. The bottom of the holder is held in contact with one side of a Peltier solid state heat pump. The oppositie side of the heat pump is clamped to the aluminium bottom of the chamber which serves as the heat sink. In this early version, a thermistor was used to control the heat pump to keep the specimen at the set temperature. The film plate is mounted inside the chamber on an adjustable slide. Based on the success of this prototype, two more chambers were requested with different focal lengths. The new units were designed with an improved temperature controller. The new unit incorporates a linear feedback sensor with a bipolar supply to allow automatic switching from cooling to heating. The set temperature is fixed by a 3 digit thumbwheel switch and the sample temperature is read out on a 3 1/2 digit display. This new sytem will hold the sample temperature between -3 degrees C and 85 degrees C with a stability of 0.02 degrees C.