US 12,332,162 B2
Photoacoustic spectrum phase locking method, apparatus, and system
Yonggang Yin, Hangzhou (CN); Danyang Ren, Hangzhou (CN); Yuqi Wang, Hangzhou (CN); Junhui Shi, Hangzhou (CN); and Yongyong Jin, Hangzhou (CN)
Assigned to ZHEJIANG LAB, Hangzhou (CN)
Filed by ZHEJIANG LAB, Hangzhou (CN)
Filed on Jul. 25, 2023, as Appl. No. 18/225,694.
Application 18/225,694 is a continuation of application No. PCT/CN2023/090960, filed on Apr. 26, 2023.
Claims priority of application No. 202211463444.X (CN), filed on Nov. 17, 2022.
Prior Publication US 2024/0167940 A1, May 23, 2024
Int. Cl. G01N 21/17 (2006.01); G01N 29/24 (2006.01)
CPC G01N 21/1702 (2013.01) [G01N 29/2418 (2013.01); G01N 2021/1704 (2013.01); G01N 2201/06113 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A photoacoustic spectrum phase locking method, comprising:
acquiring a mapping relationship between an output amplitude and an output phase of a photoacoustic spectrum system;
determining a reference phase of the photoacoustic spectrum system according to the mapping relationship; and
adjusting scanning parameters of a laser in the photoacoustic spectrum system according to the reference phase, so that an output phase in a current preset cycle of the photoacoustic spectrum system is equal to the reference phase,
wherein the adjusting the scanning parameters of the laser in the photoacoustic spectrum system according to the reference phase comprises:
acquiring the output phase corresponding to a laser modulation signal in a previous preset cycle;
adjusting the laser modulation signal in the previous preset cycle according to the output phase in the previous preset cycle, the reference phase, and a discrete proportional-integral-derivative (PID) control algorithm, to obtain a target modulation signal in the current preset cycle; and
adjusting the scanning parameters of the laser in the photoacoustic spectrum system according to the target modulation signal.