US 12,078,761 B2
Signal detection system
Shunya Katoh, Kanagawa (JP); and Naoyuki Morooka, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Nov. 27, 2020, as Appl. No. 17/105,632.
Application 17/105,632 is a continuation of application No. PCT/JP2019/021545, filed on May 30, 2019.
Claims priority of application No. 2018-103383 (JP), filed on May 30, 2018.
Prior Publication US 2021/0103041 A1, Apr. 8, 2021
Int. Cl. G01S 7/499 (2006.01); G01S 17/08 (2006.01); G01S 17/58 (2006.01); G02B 5/126 (2006.01); G02B 5/26 (2006.01); G02B 5/30 (2006.01)
CPC G01S 7/499 (2013.01) [G01S 17/08 (2013.01); G01S 17/58 (2013.01); G02B 5/126 (2013.01); G02B 5/26 (2013.01); G02B 5/3016 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A signal detection system comprising:
an emitting unit that emits polarized light as measurement light;
a retroreflection member on which the measurement light emitted from the emitting unit is retroreflected; and
a detecting unit that measures the measurement light reflected on the retroreflection member,
wherein in the retroreflection member, a reflectance of first polarized light is higher than a reflectance of second polarized light which is polarized light having a property opposite to that of the first polarized light, and
at least one of a first condition in which in the measurement light emitted from the emitting unit, an intensity of the first polarized light is higher than an intensity of the second polarized light, or a second condition in which in the detecting unit, a detection sensitivity of the first polarized light is higher than a detection sensitivity of the second polarized light is satisfied.