光电检测技术—第八章(国外英文资料).docVIP

光电检测技术—第八章(国外英文资料) This paper consists of small hate Xinjiang contribution PPT document may at the WAP end of the browsing experience poor. Suggest you select TXT, or download the source file to the machine view. The eighth chapter coherent detection method and system The eighth chapter coherent detection method and system The master content - coherent detection system Understand the content - the forming method of the photoelectric detection system. Understand the content Use of the photoelectric system - The eighth chapter coherent detection method and system 8.1 coherent phase modulation and detection method of detection principle and application of 8.2 basic interferometric system with 8.3 frequency coherent signal of 8.4 optical heterodyne detection method and system 8.1 the basic principle of coherent detection The information signal coherent detection is the use of optical coherence to carry on optical carrier detection and processing, it only uses a laser as a light source in order to achieve good coherence. According to the theory of coherent detection can accurately detect the wave amplitude, frequency and phase of the information carried by the. 8.1 the basic principle of coherent detection But because of the light frequency is very high, so far any photodetector have no direct perception of the amplitude and phase changes of light itself, frequency and polarization, and can only detect the light intensity. Therefore, these characteristic parameters of light must convert the change of light intensity detection. This conversion must pass interferometry. 8.1 the basic principle of coherent detection (a) optical interference and interference measurement - light interference refers to the possible wave coherent beams are superposed, variations of light intensity of the synthesized signal with time or space law. - interference effect is that the light phase relationship or frequency of state and their changes with time in the spatial distribution of light inte