| Temperature plays a vital role in various fields,and the detection of temperature has always been the focus of researchers.Many different types of temperature sensors have been developed in the study of temperature detection.This paper makes innovations in the testing methods and materials of temperature sensors,and designs and develops a new type of membranous temperature sensor based on polymer-based temperature films,focusing on its performance and performance in different application scenarios.The main contents of this paper include:The polymer-based thin film material is studied,its physical properties,namely,the theory of positive temperature coefficient effect,are clarified,its composition,classification and working principle applied to temperature measurement are expounded,and finally its fabrication process is introduced.Using SOLIDWORKS to the single-array element temperature film,the multiarray element temperature film and the sensor structure are designed,and the circuit adaptation is completed in combination with the acquisition system,and finally the production of the single-array element film temperature sensor and the array film temperature sensor is completed.A performance test system is built to complete the detection of the main performance parameters of the membranous temperature sensor.The results show that the temperature-resistance curve of the membranous temperature sensor can be fitted by a trinomial,the maximum change rate of the resistance value of each array element at 37 ℃ and 60 ℃ is 0.227% and 0.250% respectively,and the average repeatability of each array element is 2.6%,the maximum hysteresis is 5.6%,and the temperature response time is about 33 ms.The single-array element membranous temperature sensor was used to explore the relationship between the internal temperature change and its performance of the ultrasonic transducer under certain working conditions.The decrease of 0.21 dB,0.36 dB,1.08 dB and 1.09 dB verifies the relationship between the internal heating of the ultrasonic transducer and its performance change.Using the array membranous temperature sensor to detect the internal temperature distribution of the bionic tissue in the focused sound field,combined with the finite element simulation results,thermocouple experimental results,and membranous temperature sensor experimental results,it is concluded that the temperature distribution detection results of the membranous temperature sensor are consistent with the theoretical simulation results.,the maximum temperature difference is about 2 ℃,and the absolute temperature difference does not exceed 3 ℃compared with the traditional temperature measurement method.This paper demonstrates that the membranous temperature sensor has good performance and performs well in both application scenarios. |
