US 12,282,038 B2
Synchronous measurement system for velocity and temperature of engine plume flow field
Xunchen Liu, Shanghai (CN)
Assigned to QINGDAO ZHENNUO LASER TECHNOLOGY CO., LTD., Shandong (CN)
Filed by Qingdao Zhennuo Laser Technology Co., Ltd., Shandong (CN)
Filed on Feb. 27, 2023, as Appl. No. 18/174,987.
Claims priority of application No. 202210195344.7 (CN), filed on Mar. 1, 2022.
Prior Publication US 2023/0280365 A1, Sep. 7, 2023
Int. Cl. G01J 5/00 (2022.01); G01P 5/00 (2006.01)
CPC G01P 5/001 (2013.01) 13 Claims
OG exemplary drawing
 
1. A synchronous measurement system for a velocity and a temperature of an engine plume flow field, comprising:
four mid infrared lasers divided into two groups, wherein each group has two mid infrared lasers, one group is configured to emit two beams of first mid infrared lasers with different wavelengths respectively sensitive to high-temperature and low-temperature water molecules, and an other group is configured to emit two beams of second mid infrared lasers with different wavelengths and respectively sensitive to high-temperature and low-temperature carbon dioxide molecules;
a signal generator configured to modulate, using a time division multiplexing technology, the two beams of first mid infrared lasers into a beam of high-frequency first mid infrared laser and the two beams of second mid infrared lasers into a beam of high-frequency second mid infrared laser;
two optical fiber amplifiers configured to respectively amplify power of the beam of high-frequency first mid infrared laser and the power of the beam of high-frequency second mid infrared laser to required powers, and then respectively divide the beam of high-frequency first mid infrared laser and the beam of high-frequency second mid infrared laser into two groups of multi-channel parallel lasers;
two groups of optical fiber couplers, wherein each group of optical fiber couplers is arranged at an outlet of an engine through a mounting frame, and two mounting frames are perpendicular to each other, so that the two groups of multi-channel parallel lasers are perpendicular to each other, each group of optical fiber couplers comprises a plurality of transmitting end optical fiber couplers, and a plurality of receiving end optical fiber couplers corresponding to the plurality of transmitting end optical fiber couplers one by one, and the transmitting end optical fiber couplers are connected with the optical fiber amplifiers through optical fibers;
a photoelectric detector connected with the receiving end optical fiber couplers through an optical fiber;
a data acquisition device electrically connected with the photoelectric detector and configured to acquire, in real time, photoelectric signals after being absorbed by gaseous molecules in a rocket engine plume flow field and process the photoelectric signals into corresponding spectral data; and
a host configured to process the spectral data through built-in spectral processing software to synchronously obtain the velocity and the temperature of the engine plume flow field.