METHOD FOR NON-CONTACT OPTIC-LASER DIAGNOSTICS OF NON-STATIONARY MODES OF EDDY FLOWS, AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2013 - IPC G01P5/26 

FIELD: measurement equipment.

SUBSTANCE: invention is based on mutual use of LDA and PIV. A device includes a pulse laser with pulse energy of not less than 120 mJ, actuation frequency of not less than 16 Hz, two CCD chambers with frequency resolution of 8 to 16 Hz, which are located at an angle of 30÷120° to each other and at an angle of 15÷60° to a channel axis after a rotor, optic prisms, an image processing processor, a laser anemometer with an optic probe, which is made on an argon laser and a Doppler signal processing processor, and a personal computer. The method involves measurements by means of LDA at two and more points of non-stationary eddy flux after the rotor of a wind or hydraulic unit for determination of a time interval, illumination of flux with a laser knife, recording of images of sown particles with two CCD chambers and recording at the specified time interval, statistical averaging of instantaneous velocity fields for n=2÷16 of moments inside of a full period of pulsations of vortex structure T by sampling of velocity fields obtained with time delay t=0, T, 2T,… and (m-1)T, where m - number of measurements of instantaneous velocity fields for statistical averaging.

EFFECT: essential reduction of a random measurement error and almost full elimination of a systematic error related to non-stationary changes of flux structure.

2 cl, 2 dwg