Fluid diagnostic technique

Details Fluid diagnostic technique Fluid diagnostic technique

1999-03-30

2000-10-17

Font, Frank G.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

388390, 388393, 388394, G01D 330

Patent

active

061340014

ABSTRACT:
A non-obstructive fluid diagnostic technique is described which enables the measurement of different parameters in a fluid. The diagnostic technique includes the steps of focusing a laser (10) in a fluid volume (14) to generate a laser induced breakdown spark (15). The characteristics of the initial laser induced breakdown spark (15) are measured and compared to the characteristics of a delayed image of the spark, formed by light emission due to recombination and excited molecules and ions generated by the laser induced spark (15). The differences between the initial and delayed images being used to diagnose characteristics of the fluid, such as velocity, temperature and pressure.

REFERENCES:
patent: 5153665 (1992-10-01), Weinstein
patent: 5333044 (1994-07-01), Shaffer
On the cooling of the plasma fireball produced by a laser spark in front of liquids and solids--D.Kaganovich et al., Phys. Plasmas 3 (2), Feb. 1996; 1996 American Institute of Physics.
Spectroscopic study of laser-produced plasmas in hydrogen, J. F. Kielkopf, vol. 52, No. 2, Physical-Review E. Aug. 1995.

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