Abstract

[Problem] To provide a low-cost, high-precision three-dimensional shape measuring device using vibration-resistant phase shift digital holography. [Solution] A three-dimensional shape measuring device, wherein an object-light optical system allows object light to be incident on a polarization element for detecting relative phase differences in a first circularly polarized light state, a reference-light optical system allows a reference light to be incident on a polarization element for detecting relative phase differences in a second circularly polarized light state in the direction opposite from the first circularly polarized light, and the polarization element for detecting relative phase differences transmits a component of the object light, which is the first circularly polarized light, in the polarization direction of the polarization element for detecting relative phase differences, and a component of the reference light, which is the second circularly polarized light, in the polarization direction of the polarization element for detecting relative phase differences. The polarization direction of the polarization element for detecting relative phase differences is rotated to thereby vary the relative phase difference between the object light and the reference light transmitted through the polarization element for detecting relative phase differences and to acquire a plurality of hologram images having different relative phase differences.

IPC Classes  ?

• G01B 9/023 - Interferometers using holographic techniques for contour producing
• G01B 9/02 - Interferometers
• G01B 11/24 - Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
• G03H 1/00 - Holographic processes or apparatus using light, infrared, or ultraviolet waves for obtaining holograms or for obtaining an image from themDetails peculiar thereto
• G03H 1/04 - Processes or apparatus for producing holograms

Abstract

[Problem] To provide a personal authentication device having a thin and simple structure using a holographic optical element. [Solution] A personal authentication device verifies identity on the basis of biometric information of an object to be authenticated, and is provided with: a light source; a stage on the front side of which the object to be authenticated is disposed; an image capturing means which captures an image of the biometric information of the object to be authenticated; a holographic optical element for lighting which is disposed on a part of the stage and irradiates the object to be authenticated with light from the light source; and a holographic optical element for image capturing which is disposed on another part of the stage and collects light from the object to authenticated into the image capturing means.

IPC Classes  ?

• G06T 1/00 - General purpose image data processing
• A61B 5/117 - Identification of persons
• G02B 5/32 - Holograms used as optical elements

Abstract

[Problem] To provide a low-cost, high-precision three-dimensional shape measuring device using vibration-resistant phase shift digital holography. [Solution] A three-dimensional shape measuring device, wherein an object-light optical system allows object light to be incident on a polarization element for detecting relative phase differences in a first circularly polarized light state, a reference-light optical system allows a reference light to be incident on a polarization element for detecting relative phase differences in a second circularly polarized light state in the direction opposite from the first circularly polarized light, and the polarization element for detecting relative phase differences transmits a component of the object light, which is the first circularly polarized light, in the polarization direction of the polarization element for detecting relative phase differences, and a component of the reference light, which is the second circularly polarized light, in the polarization direction of the polarization element for detecting relative phase differences. The polarization direction of the polarization element for detecting relative phase differences is rotated to thereby vary the relative phase difference between the object light and the reference light transmitted through the polarization element for detecting relative phase differences and to acquire a plurality of hologram images having different relative phase differences.

IPC Classes  ?

• G01B 9/021 - Interferometers using holographic techniques
• G01B 11/24 - Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures