US 11,666,237 B2
Measurement apparatus and measurement method
Atsushi Ito, Kanagawa (JP); and Kazunari Yoshifuji, Tokyo (JP)
Assigned to SONY CORPORATION, Tokyo (JP)
Appl. No. 16/757,294
Filed by SONY CORPORATION, Tokyo (JP)
PCT Filed Oct. 12, 2018, PCT No. PCT/JP2018/038044
§ 371(c)(1), (2) Date Apr. 17, 2020,
PCT Pub. No. WO2019/082688, PCT Pub. Date May 2, 2019.
Claims priority of application No. JP2017-207776 (JP), filed on Oct. 27, 2017.
Prior Publication US 2021/0186345 A1, Jun. 24, 2021
Int. Cl. A61B 5/026 (2006.01); A61B 5/0285 (2006.01); G01F 1/66 (2022.01)
CPC A61B 5/0261 (2013.01) [A61B 5/0285 (2013.01); G01F 1/66 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A measurement apparatus, comprising:
a light source configured to emit at least partially coherent light;
a photodiode configured to:
receive the partially coherent light emitted from the light source by way of a measurement target; and
detect a signal proportional to the received partially coherent light; and
circuitry configured to:
perform an analog to digital conversion of the signal to generate a digital data;
extract a segment of the digital data;
obtain value of respective data points on the extracted segment of the digital data;
calculate, based on the extracted segment, a mean value of the digital data;
calculate a number of times the mean value and the value of the respective data points intersects; and
output a measured value of blood flow of the measurement target based on the number of times the mean value and the value of the respective data points intersects.