Study Of Nondestructive Retrieval Method For The Measurement Of Human Internal Temperature By Microwave

Recently with the increasing development of modern medicine, there is more and more application need for precise measurement of human internal temperature and real-time monitoring such as the monitoring of brain temperature for newborn infants and tumor diagnosis through the measurement of tissue temperature. Traditionally for the measurement of human temperature we tend to have an operation to implant temperature sensing elements. However, in this way it not only changes the original temperature distribution but also damages human body. And among the non-contact measurement methods, the microwave radiometry technology is found to have an advantage of its non-destructive and real-time character for the measurement of human temperature. Therefore, there is a bright developing prospect and study significance in the field of human medical measurement for the microwave radiometry technology. Based on the above, this paper does some research on the inversion method of internal body temperature measurement with microwave radiometers.In this paper, firstly I expound the principle of the nondestructive measurement of human internal temperature with microwave radiometers. Then on the basis of existing microwave radiative for transfer models of human tissue, I create a five-layered radiation model of human tissue. And I simulate it with both coherent and non-coherent method whose results are compared to verify the correctness of the model. Compared to the existing models, my model takes multiple reflections into consideration and is able to calculate brightness temperature for the situation of different launch angles. Next, on the basis of the study of various inversion methods, I select the multi-angel method to retrieve human internal temperature. After simulation and calculation, the inversion values are close to theoretical values, which verify the correctness of the inversion method. Finally, I measure the brightness temperature of water distributed linearly with depth with a C-band microwave radiometer and calculate the inversion values of water temperature for different depths with the multi-angel method, which verifies the effectiveness of the measurement method for human temperature.