TEMPERATURE CONTROLLED CHAMBER FOR X-RAY DIFFRACTION SPECIMENS

X 射线衍射样品的温控室

• 批准号: 3978300
• 负责人: C P MUDD
• 金额: --
• 依托单位: DIVISION OF RESEARCH SERVICES
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3978300
• 关键词: X ray crystallography; aluminum; beryllium; carbonates; temperature

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.

原型室由聚碳酸酯和铝构成， 铍窗口，以允许X射线束进入。 所在的单元格 将样品装入窗口旁边的保持器中。 的底部 保持器保持与珀耳帖固态加热器的一侧接触 泵 热泵的另一面是夹在铝 作为散热器的腔室的底部。 在这个早期 版本中，热敏电阻用于控制热泵，以保持 在设定温度下对试样进行加热。 胶片板安装在 可调节滑块上的腔室。 基于这个原型的成功， 还需要另外两个具有不同焦距的腔室。 新 装置设计有改进的温度控制器。 新单位 采用双极电源的线性反馈传感器， 从制冷到制热的自动切换。 设定温度固定 通过3位指轮开关，在 3 1/2位显示。 这个新系统将保持样品温度 在-3 ℃和85 ℃之间，稳定性为0.02 ℃。