智能型外逸电子传感器的研究与设计

Study and Design of Intelligence Exoelectron Sensor

在研究了ＧＭ等计数管的基础上，提出了检测金属表面微裂纹发射外逸电子的智能型传感器的设计方案，采用了ＩＢＭＰＣ／ＸＴ进行系统数据采集与处理，解决了正离子轰击试件时而出现的外逸电子过多计数问题。实验结果表明，该传感器的电子控制与接口电路设计合理，测量精度高。

Since the theory of “exoelectron emission” was advanced by the late Dr.J.Kramer at the first international exoeletron conference, much research work has been done by many scientists in the field on how to measure accurately the number of exoelectrons emitted from microcracks onto the surface of metallic materials. Based on the work of E. Link, M. Uda, S. Yamamoto, etc, we have successfully designed the double grid air counter(DGAC) controlled by IBM PC. Its main features are presented as follows: 1.By contrast with GeigerMully counter(GMC), the DGAC has overcome the problem of overcounting the number of exoelectrons. The problem with GMC is that a great number of positive ions, discharged from GMC, bombards the metallic sample during the measurement. 2.DGAC is light in weight and small in size owing to the adoption of the integrated circuit of system hardware. Data collection and processing in the system is completed by IBM PC. The system software is programmed by integration of C language and the assembler language; This solves the key problem of the transfer of assembler language by the C language. An integrative software of man and machine with attractive interface has been worked out. 3.Experiments have shown that the output voltages u 1 and u 2 were consistent with those in Fig.2, and the measurement precision was important and valuable in the study and detection of formation and growth of microcracks of the surface of metallic materials in the initial stage of fatigue damage.