摘要
近红外光谱学技术是无损检测与诊断的重要方法。采用频率分辨光谱学技术，检测以相位表示的光源与探测器之间的传输延迟，与光强检测相比具有更高的灵敏度。当在均匀介质中存在两个幅值相等、初始相位相差１８０°的近红外光源阵列时，依据光学相干原理，两光源的中垂线即为幅值为零、相位突变的零线。但当均匀介质中存在光学性质不同的异物时，零线会发生偏折。这种差异性即可提供有关异物大小、位置等信息。乳腺癌被认为是存在于乳房这一均匀组织中的异物。因此，基于上述原理，我们已研制出可用于无损检测乳腺癌的新型医疗仪器。与目前用的Ｘ射线、ＣＴ等比较，本仪器具有体积小、价格便宜、易于推广等优点。
Near infrared spectroscopy is an important method in noninvasive detection and diagnosis.Frequency resolved spectroscopy technology is used in measuring the mean transport delay between source and detector in terms of phase.Compared with intensity measurement,phase measurement has a higher sensitivity.When two light sources with same amplitude and an initial phase difference of 180° are placed in a homogeneous system,according to interference theory,there will be a phase jump of 180° and a null intensity in the center plane of the two sources.However,the null plane will be distorted if there is a heterogeneity in the system.This distortion can provide information for the size and location of the heterogeneity.It is considered that breast tumor is a heterogeneity existing in the homogeneous breast tissue.So,based on the theory mentioned above,we have developed an instrument for detecting breast tumor.This instrument has the advantages of small volume,low price compared with the commonly used X ray and CT.
出处
《红外技术》
CSCD
北大核心
1997年第6期35-39,共5页
Infrared Technology
基金
国家自然科学基金
关键词
频率分辨光谱学
激光相位陈列
相位检测
乳腺癌
Frequency resolved spectroscopy Laser phase array Interference Phase detecting Breast tumor
