公开(公告)号：US10429244B2

公开(公告)日：2019-10-01

申请号：US15559872

申请日：2016-03-17

Applicant: NEC Corporation

Inventor： Takeshi Akagawa ,  Masahiro Kubo ,  Katsumi Abe ,  Kimiyasu Takoh ,  Ersin Altintas ,  Yuji Ohno ,  Tetsuri Ariyama

IPC: G01J9/02 ,  G01B9/02 ,  G01N21/41 ,  G01N21/45

Abstract: [Object]To obtain interference light having a stronger light intensity, and to more accurately measure a refractive index of a measured object, with a simplified configuration.[Solution Means]A light measurement device 100 includes a phase adjustment unit 120 and a detector 140. The phase adjustment unit 120 outputs reference light E(R) based on object light E1 being light to be obtained by transmission or reflection of light E from a light source with respect to a measured object 200, and signal light E(S) whose phase is adjusted to be different from a phase of signal light. The detector 140 derives a transmission or reflection light intensity distribution or a refractive index of the measured object 200, based on interference light E2 between signal light E(S) and reference light E(R) to be output by the phase adjustment unit 120. An optical axis of light E from a light source is linearly disposed. The phase adjustment unit 120 and the detector 140 are disposed on the optical axis of light E from a light source.

公开(公告)号：US10268874B2

公开(公告)日：2019-04-23

申请号：US15523057

申请日：2015-10-20

Applicant: NEC Corporation

Inventor： Yuji Ohno ,  Masahiro Kubo ,  Katsumi Abe ,  Takeshi Akagawa ,  Kimiyasu Takoh ,  Ersin Altintas ,  Tetsuri Ariyama

IPC: G06K9/00 ,  A61B5/024 ,  A61B5/1172 ,  G01J3/10 ,  G01J3/28 ,  G06F17/30 ,  G06F21/32

Abstract: A biometric authentication apparatus 10 according to the present invention can be installed in facilities such as airports in order to improve the reliability of biometric authentication to ensure a high level of security. The biometric authentication apparatus 10 includes a illumination unit 11 which irradiates a human finger with light; an image acquisition unit 13 which acquires a plurality of images indicating changes in luminance by receiving light scattered at the human finger that is a part of the light with which the human finger is irradiated by the illumination unit 11 and converting the received light to luminance information according to the intensity of the light; an image-to-biometric-information conversion unit 14 which converts the plurality of images acquired by the image acquisition unit 13 to biometric information indicating a pulse wave in the human finger; and a biometric authentication unit 16 which performs biometric authentication when a pulse wave signal which is the biometric information resulting from the conversion by the image-to-biometric-information conversion unit 14 is greater than a predetermined threshold.