公开(公告)号：US3816647A

公开(公告)日：1974-06-11

申请号：US24131772

申请日：1972-04-05

Applicant: NORTHROP CORP

Inventor： CHANG M ,  MCCRICKERD J

IPC: G06E3/00 ,  G06K9/74 ,  H04N3/00

CPC classification number: G06E3/003 ,  G06K9/74

Abstract: A light beam is generated by means of a narrow band collimated light source, and this light beam is modulated in accordance with an electrical input signal to be identified. The light beam is then optically scanned at a predetermined scanning rate to produce an optical image of the input signals against a time base. Light from this optical image is passed through a holographic reference transparency, which is a spatial filter corresponding to the Fourier transform of the image of known electrical signals, the light passing through the transparency being fed to a detector. Successive reference transparencies are utilized until correlation between the transparency and the input signal to be identified is indicated by a peaking of the detector output which is sensed by a correlation indicator.

公开(公告)号：US3723010A

公开(公告)日：1973-03-27

申请号：US3723010D

申请日：1971-02-19

Applicant: NORTHROP CORP

Inventor： MC CRICKERED J ,  CHANG M

IPC: G01B9/021 ,  G04B9/00 ,  G01N21/16

CPC classification number: G01B9/021

Abstract: Coherent light as may be generated by a laser is passed through pattern forming means to generate a predetermined light pattern. This pattern of light passes through a standard or reference transparent member to a photosensitive plate on which a hologram of the image as optically affected by the transparent member is produced. Coherent light is then passed through a similar transparent member to be tested, the light pattern for the second member preferably differing from that for the first so as to facilitate a qualitative comparison between the two. The two patterns are compared for alignment with each other and a photographic record made which is capable of indicating the results of this comparison, the optical characteristics of the transparent member under test as compared with those of the reference member being determined from the degree of misalignment between the two patterns.

Abstract translation: 可以由激光产生的相干光通过图案形成装置以产生预定的光图案。 这种光线通过标准或参考透明构件到感光板，在该感光板上产生光学影响透明构件的图像全息图。 然后相干光通过待测试的类似的透明构件，第二构件的光图案优选地与第一构件的光图案不同，以便于两者之间的定性比较。 将两种图案进行比较以进行对准，以及能够指示该比较的结果的照相记录，与参考构件的光学特性相比，被测透明构件的光学特性由不对准程度确定 两种模式之间。