一、前言具有给定精度和作为时间给定函数的热系统的温度保持问题是各项测量技术中的主要技术问题,而且也大大地限制了许多方法的进一步发展。吸附式量热计就是一个例子,特别是贝克式量热计,对测量在较高温度下的金属薄膜的吸附热的主要障碍,就是在量热式恒温器中缺乏足够的温度灵敏度 I. INTRODUCTION The temperature maintenance of thermal systems with a given accuracy and as a function of time is a major technical issue in various measurement techniques and also greatly limits the further development of many methods. Adsorption calorimeter is an example, especially the Baker-type calorimeter, the main obstacle to measuring the heat of adsorption of the metal film at higher temperatures is the lack of sufficient temperature sensitivity in a calorimeter