Leak locating and mapping system and method

DETAILED DESCRIPTION These and other objects are achieved by a leak locator constructed according to the present invention which comprises a recording medium, a laser, optical components which cooperate with the laser to create and superimpose successive holographic images of a test subject upon the recording medium, means for selectively pressurizing the test subject and a means for analyzing the interference between the superimposed images.
In use with rocket engines, the device is operated to create a first, reference hologram of the test engine before the engine is pressurized with purging fluid.
A second holographic image is then taken during the purging of the engine which image is superimposed over the reference image.
By means of a real-time television monitoring screen, resultant lines of interference in the superimposed images are analyzed for distortions, which correspond with the location and magnitude of leakage flows at or about the engine.
Each holographic image may be created with pulsed laser beams of sufficient duration to diminish the effects of vibration in the test engine during the purging and/or test firing of the engine.
Once a leak is detected, additional holographic images may be taken and superimposed over the reference image in order to measure the time-domain characteristics of the leak.
A video camera and recorder is also provided to preserve a record of the test results.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.