Analysis of microwave-induced thermoacoustic signals and research-development preprocessor.
- Author:
Yusen WEI
1
;
Hua WANG
;
Xinya ZHU
;
Teng JIAO
;
Guosheng YANG
Author Information
1. Department of Biomedical Engineering, The Fourth Military Medical University, Xi'an 710032, China.
- Publication Type:Journal Article
- MeSH:
Acoustics;
instrumentation;
Algorithms;
Biophysical Phenomena;
Computer-Aided Design;
Equipment Design;
Microwaves;
Thermography;
instrumentation;
methods;
Tomography;
instrumentation;
methods
- From:
Journal of Biomedical Engineering
2009;26(3):471-474
- CountryChina
- Language:Chinese
-
Abstract:
According to the results of analyzing the microwave-induced thermoacoustic signals, the amplitude and frequency were estimated and the designing parameters of preprocessor were decided. Based on the parameters, the signals preprocessor was designed with the band pass frequency ranging from 50 KHz to 3MHz, the gain ranging from 55 dB to 105 dB and the output noise being 1.32 V when the input was zero and the gain was 105 dB. The de-noising method of thermoacoustic signals was also discussed. The signals can be picked up by the preprocessor combined with the digital multipoint average method. The amplitude of signals is only 5 microV or even less. The results indicated that the preprocessor can meet the needs of thermoacoustic signals acquisition in bandwidth, gain and noise control.
