ALL TANTALUM STOPPED FLOW DIFFERENTIAL MICRO-CALORIMETER

基于最近批量使用的传感器设计技术 微量热计，我们设计了一种全钽止流 具有更高灵敏度和更快响应速度的量热计 泰晤士报。钽流组件由两个入口管和一个入口管组成 出口管是电子束焊接到钽混合器上的。一个数组 小型、快速响应的热电堆位于 出口管。出口管的体积为350微升。一个 0.1 mm的不锈钢丝也连接到出口管上，用于 校准。在此差速器中使用了两个这样的组件 乐器。油管的感测部分安装在大热量中 下沉并保持在量热计的核心或工作温度。AS 这些管子进入和离开散热器，它们被布置在一起，以便 沿管子向下传播的热伪影将显示为共模 而不是差分信号。由此产生的仪器的灵敏度为1 焦耳/伏特*秒和48秒的10%至90%阶跃响应。

Based upon the sensor design techniques recently used in batch micro-calorimeters, we have devised an all tantalum stopped flow calorimeter with significantly greater sensitivity and faster response times. The tantalum flow assembly consists of two inlet tubes and one outlet tube which are electron-beam welded to a tantalum mixer. An array of small, fast response thermopiles are located on opposite sides of the outlet tube. The outlet tube contains a volume of 350 micro-liters. A 0.1 mm stainless wire is also attached to the outlet tube for use in calibration. Two such assemblies are used in this differential instrument. The sensing portion of the tubing is mounted in a large heat sink and kept at the core or operating temperature of the calorimeter. As the tubes enter and leave the heat sink, they are routed together so that thermal artifacts propagating down the tubes will appear as common-mode and not differential signals. The resulting instrument has a sensitivity of 1 joule/volt*second and a 10 to 90% step response of 48 seconds.