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一种微波探测声音方法的实现
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作者 刘诗伟 林周福 梁生辉 《山西电子技术》 2011年第5期39-40,82,共3页
提出了一种微波探测声音(微波窃听)的方法,并简要介绍了它的原理和实现方式。通过微波振荡器产生的微波,经天线发射后投射到待测声源处,被声源处的音频信号调制后反射回来,由天线接收后输送到微波晶体检波器检波,再由小电流放大、电压... 提出了一种微波探测声音(微波窃听)的方法,并简要介绍了它的原理和实现方式。通过微波振荡器产生的微波,经天线发射后投射到待测声源处,被声源处的音频信号调制后反射回来,由天线接收后输送到微波晶体检波器检波,再由小电流放大、电压和功率放大等处理,还原出声源处的声音信号,达到探测声音的目的。 展开更多
关键词 微波探声 幅度调制 检波
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DIAGNOSTIC VALUE OF MINIPROBE ULTRASONOGRAPHY IN ESOPHAGEAL PROTRUDING LESIONS
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作者 应涛 胡兵 冯亮 《Journal of Shanghai Second Medical University(Foreign Language Edition)》 2007年第2期141-146,共6页
Objective To investigate the diagnostic value of miniprobe ultrasonography (MPS) in the protruding lesions of esophagus. Methods Sixty-two patients with protruding lesions of esophagus were examined with MPS. Results ... Objective To investigate the diagnostic value of miniprobe ultrasonography (MPS) in the protruding lesions of esophagus. Methods Sixty-two patients with protruding lesions of esophagus were examined with MPS. Results The MPS examination showed diseases of esophageal polyp, inflammatory protruding, esophageal leiomyoma, esophageal leiomyosarcoma, esophageal venous aneurysm, esophageal lipoma, esophageal cyst, esophageal carcinoma, and extra esophageal compression including aorta compression, lung tumor compression and spina compression. Fourteen patients were verified by surgical operations and pathological examinations, resulting in 92.86% (13/14) diagnosis accuracy rate. Forty-eight cases had results of gastroscope examination consistent with that of MPS. Twelve cases had results of CT and MRI examination consistent with that of MPS. Follow-up was completed on 22 patients. Conclusion Besides imaging the esophageal layer, MPS can precisely locate the histological layer of the esophageal protruding lesions and predict their characters. This indicates its value in the diagnosis and differential diagnosis of the protruding lesions of esophagus. Furthermore, the miniature probe used in MPS examination can pass the structured esophagus, enabling wider application of the examination. 展开更多
关键词 miniprobe ultrasonography ESOPHAGUS protruding lesion DIAGNOSIS
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