Abstract : This paper addresses the problems of low measurement accuracy and poor dynamic characteristics of semiconductor absorption temperature sensors. Improvements were made from both hardware and software aspects. Hardware improvements included refining the sensor head material, the power supply to the optical emission circuit, and the connection between the optical fiber and other components, thereby improving measurement accuracy and reducing the dynamic response time from 15 seconds to 8 seconds. Software compensation using a neural network inverse dynamic compensator further reduced the dynamic response time to 4 seconds. The improved fiber optic temperature measurement system fully meets the accuracy and timeliness requirements of temperature monitoring. Keywords : Fiber optic temperature sensor; hardware improvement; software compensation; practical temperature measurement system; 1. Introduction Accurate temperature measurement and real-time monitoring are crucial in high-pressure, strong magnetic, and flammable/explosive environments. However, in many cases, traditional temperature sensors such as thermocouples are unusable. For example, the strong magnetic field environment in high-voltage power switchgear can severely interfere with thermocouple sensors, affecting measurement accuracy. High-voltage arcs in the switchgear can puncture thermocouples, damaging measuring equipment and even causing fires. In flammable and explosive environments, the use of electrical sensors requires extreme caution; equipment leakage can lead to combustion and explosion, causing property damage and personal injury. With the rapid development of fiber optic communication technology, temperature sensors, represented by optical fibers, have become an effective measurement method under these harsh conditions. Among various existing fiber optic temperature sensors, semiconductor absorption fiber optic temperature sensors have attracted widespread attention due to their simple structure, easy processing, and low cost. However, these fiber optic sensors also have some problems, such as low measurement accuracy and poor dynamic characteristics. Therefore, various improvements have been made to these sensors, proposing improved schemes such as the "dual-path reference method" and the "dual-source reference method," achieving some success. However, these improvements make the equipment very complex and significantly increase costs, making them unsuitable for many conventional applications. Therefore, this paper presents various reasonable improvements to this semiconductor absorption fiber optic temperature sensor, enabling it to achieve better measurement accuracy and dynamic characteristics with minimal cost increase, thus making it more practical. (Full text of the development of a practical fiber optic temperature measurement system available for download.)