US 11,986,844 B2
Method and apparatus for monitoring a flow field of a particle jet
Jussi Larjo, Tampere (FI)
Assigned to OSEIR OY, Tampere (FI)
Appl. No. 17/621,296
Filed by OSEIR OY, Tampere (FI)
PCT Filed Jun. 11, 2020, PCT No. PCT/FI2020/050408
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2020/260754, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 20195557 (FI), filed on Jun. 24, 2019.
Prior Publication US 2022/0355324 A1, Nov. 10, 2022
Int. Cl. B05B 12/08 (2006.01); G01P 3/38 (2006.01); G01P 3/40 (2006.01)
CPC B05B 12/082 (2013.01) [G01P 3/38 (2013.01); G01P 3/40 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for controlling gas dynamic spraying, the method comprising:
providing a particle jet by using an accelerating nozzle,
illuminating the particle jet with illuminating light pulses,
capturing images of the particle jet illuminated with the illuminating light pulses, and
determining one or more velocities of particles of the particle jet by analyzing the captured images,
wherein the images are captured by using an imaging unit which comprises imaging optics to form an optical image of an object plane on an image sensor by focusing light, wherein an optical axis of the imaging unit is inclined with respect to a central axis of the nozzle, wherein the image sensor is inclined with respect to the optical axis such that the object plane is substantially parallel with a direction of movement of particles of the particle jet, and wherein the image sensor is inclined with respect to the optical axis such that the angle between the surface normal of the image sensor and the optical axis is substantially different from zero.