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Excited states generated by absorption of incident radiation, then from this excited state emission is the mood light-emitting fluorescence phenomena are mood light, involving used two types of radiation: excitation and emission. Laser-induced fluorescence spectroscopy (LIFS: Laser Induced Fluorescence Spectroscopy) is a laser as the excitation light source of fluorescence spectroscopy, can be done resonant excitation, and therefore has a higher sensitivity for the combustion flow field measurement has a better advantage. Been proposed in PLIF LIFS and planar laser induced fluorescence (the PLIF: Planar Laser Induced Fluorescence) principle is basically the same, but the latter has a very good spatial and temporal resolution capabilities. If the large spot formed by the infrared light band has some influence on the green laser beam light emitted by cheap Laser Pointers.
PLIF technique in the diagnosis of aero-engine combustion more attention. LIFS temperature measurement principles and methods are more complex, in particular, the quenching rate level in dealing with different problems, and weaknesses in the capacity measurement and spatial resolution of the unsteady flame, so the temperature of LIFS research is generally not paid enough attention. LIFS technology also has its own advantages, such as barium 4 amount, the spectrum with quantization is more convenient, simple optical path in the flame of the low spatial and temporal resolution advantages. The early 1990s, R. K. Hanson and other hydroxyl and nitric oxide composition and temperature distribution measurement techniques are explored, and the application attempts to shock heating fluid model supersonic combustion engine. The result of visual fault locator is always very accurate.
Although in a simple simulation stage, but as a principle of demonstration measurements, this study has some significance. PLIF technical progress in the ability of time-resolved using a double set of PLIF measurement system, with the transient structure of the combustion flow field measurements and the use of two-lane excitation method to measure non-steady-state combustion flow field temperature distribution capacity. PLIF measurements of the flow field simulation tends to be complex, some of the classic wedge and cylinder high-speed flow field have been studied to show the level of application increased. The ability to distinguish NO and OH PLIF technique to study the shock wave reflection transition process, hypersonic shock premixed combustible gas supersonic flow around a cylinder, wedge flow around the flow structure and temperature distribution on the use of time. It is better for the customer not to use visual fault locator  to irradiant to people’s eyes or heads.
Laser scanning pressure-sensitive paint technology. Laser technology and laser scanning pressure-sensitive paint (Laser-scanning Pressure-the Sensitive the Paint, PSP) technology combining can be used for measuring compressor blade surface static pressure distribution. The principle is: the laser irradiation to the the UUT PSP coating, a function of the luminescent signal generated by the static pressure of the part surface. The traditional methods of surface static pressure measurements is arranged in the measured surface pressure sensor, although able to measure the local static pressure of the surface, but can not fully give the surface static pressure distribution, but will inevitably destroy the original flow field. The PSP technique can avoid such problems. If not, it is unnecessary for visual fault locator to be equipped with the infrared optical.
Provide valuable experimental basis for measuring compressor blade surface static pressure distribution for the blade design and material selection. PSP technology instantaneous surface pressure distribution of the test body, without the need for complex theoretical model to calculate the R & D time and money savings. Laser gas analysis techniques. Laser-induced incandescent technology. Incomplete combustion of fuel in jet engine development process, will produce large amounts of smoke particles, not only the combustion efficiency, but due to the accumulation of carbon can easily plug the fuel nozzle, damage materialized quality, the full impact of the combustor performance. In addition, the combustion of carbon particles, carbon monoxide, nitrogen dioxide and other chemicals is an important source of pollution of the environment and human health. How to determine power of visual fault locator?