红外波段位于可见光波段与微波波段之间,相比较可见光具有热效应、不可见以及穿透性强等特点。随着以红外激光作为相干光源的红外全息技术迅速发展,红外全息技术在无损检测和无透镜成像领域已经表现出可见光全息技术无可比拟的优势。本...红外波段位于可见光波段与微波波段之间,相比较可见光具有热效应、不可见以及穿透性强等特点。随着以红外激光作为相干光源的红外全息技术迅速发展,红外全息技术在无损检测和无透镜成像领域已经表现出可见光全息技术无可比拟的优势。本文回顾了红外全息技术的发展历程,介绍了红外数字全息(Infrared Digital Holography,IRDH)技术、扫描红外数字全息(Scanning Infrared Digital Holography,SIRDH)技术、红外数字全息显微(Infrared Digital Holographic Microscopy,IRDHM)技术的研究状况,归纳总结了红外全息技术的检测优势和典型应用情况,最后展望了红外全息技术的未来发展趋势。展开更多
A new method called multi-frequency holography (MFH) for two-dimensional radar cross-section imaging of rotating objects is introduced, in which a constant coherent reference signal from transmitted signal is added in...A new method called multi-frequency holography (MFH) for two-dimensional radar cross-section imaging of rotating objects is introduced, in which a constant coherent reference signal from transmitted signal is added into received signal over certain frequency-width. With the MFH only the intensity of received composite signals needs to be measured. Both imaging situations of far field and near field are considered in details. Special restrictions about the MFH are also discussed and simulated by numerical computation. Examples of numerical simulation show that the method is effective, applicable and perspective.展开更多
Collinear Holography was proposed by OPTWARE Corporation, in which the information and reference beams were aligned co-axially and modulated by the same SLM. With this unique configuration the optical pickup can be de...Collinear Holography was proposed by OPTWARE Corporation, in which the information and reference beams were aligned co-axially and modulated by the same SLM. With this unique configuration the optical pickup can be designed as small as the DVD ′ s, and can be placed on one side of the recording disc. A 2-dimensional digital page data format was used and the shift-multiplexing method was employed to increased recording density of HVD. As the servo technology is being introduced to control the objective lens to be maintained precisely to the disc in the recording and the reconstructing process, a vibration isolator is no longer necessary. In HVD, the pre-formatted meta-data reflective layer was used for the focus/tracking servo and reading address information, and the dichroic mirror layer was used for detecting holographic recording information without interfering with the preformatted information.Experimental and theoretical studies suggest that the holographic material is very effective to increased recording density of the system. HVD will be compatible with existing disc storage systems, like CD and DVD, and enable us to expand its applications into other optical information storage systems.展开更多
文摘红外波段位于可见光波段与微波波段之间,相比较可见光具有热效应、不可见以及穿透性强等特点。随着以红外激光作为相干光源的红外全息技术迅速发展,红外全息技术在无损检测和无透镜成像领域已经表现出可见光全息技术无可比拟的优势。本文回顾了红外全息技术的发展历程,介绍了红外数字全息(Infrared Digital Holography,IRDH)技术、扫描红外数字全息(Scanning Infrared Digital Holography,SIRDH)技术、红外数字全息显微(Infrared Digital Holographic Microscopy,IRDHM)技术的研究状况,归纳总结了红外全息技术的检测优势和典型应用情况,最后展望了红外全息技术的未来发展趋势。
文摘A new method called multi-frequency holography (MFH) for two-dimensional radar cross-section imaging of rotating objects is introduced, in which a constant coherent reference signal from transmitted signal is added into received signal over certain frequency-width. With the MFH only the intensity of received composite signals needs to be measured. Both imaging situations of far field and near field are considered in details. Special restrictions about the MFH are also discussed and simulated by numerical computation. Examples of numerical simulation show that the method is effective, applicable and perspective.
文摘Collinear Holography was proposed by OPTWARE Corporation, in which the information and reference beams were aligned co-axially and modulated by the same SLM. With this unique configuration the optical pickup can be designed as small as the DVD ′ s, and can be placed on one side of the recording disc. A 2-dimensional digital page data format was used and the shift-multiplexing method was employed to increased recording density of HVD. As the servo technology is being introduced to control the objective lens to be maintained precisely to the disc in the recording and the reconstructing process, a vibration isolator is no longer necessary. In HVD, the pre-formatted meta-data reflective layer was used for the focus/tracking servo and reading address information, and the dichroic mirror layer was used for detecting holographic recording information without interfering with the preformatted information.Experimental and theoretical studies suggest that the holographic material is very effective to increased recording density of the system. HVD will be compatible with existing disc storage systems, like CD and DVD, and enable us to expand its applications into other optical information storage systems.
