การพัฒนาระบบควบคุมอุณหภูมิสำหรับกล้องจุลทัศน์แบบส่องกราดในอุโมงค์

Abstract

This research article describes the design and development of a temperature control system used for a scanning tunneling microscope (STM). By combining the spherical closed surface capsule, for isolating the ambient temperature of an STM from the low temperature stability in experimental room, and the temperature control system for heat convector, the control of ambient temperature for an STM yields the verified stability level. The results of temperature control of heat convector and process for heat exchanging with the spiral copper pipe in the closed surface capsule illustrate that temperature inside the capsule has fast response with delay time of 12 min. The system can control the temperature stability in the closed surface capsule with the level of 200 m°C for over 5 hours, continuously. The temperature stability with the level of 50 m°C is achieved for a period of 40 min.