Laser-induced fluorescence combustion field parameter measuring device

Abstract

The invention discloses a laser-induced fluorescence combustion field parameter measuring device which comprises a light source system and a detection system, wherein the light source system comprises a laser (5), an optical fiber coupling lens (1), a plastic optical fiber bundle (2), a spherical lens (3) and a cylindrical lens (4), wherein the optical fiber coupling lens (1), the plastic optical fiber bundle (2), the spherical lens (3) and the cylindrical lens (4) are arranged in the laser transmission direction in sequence; an optical fiber configuration section on the incident end surface of the plastic optical fiber bundle (2) is matched with a light beam section of the laser (5), and the emergent end surface of the plastic optical fiber bundle (2) is configured into a linear shape; and a cylindrical center line of the cylindrical lens (4) is parallel to an optical fiber configuration line on the emergent end surface of the plastic optical fiber bundle (2). The laser-induced fluorescence combustion field parameter measuring device has the benefits that a lamellar light beam with uniform light intensity in an area on the light beam transmission direction is realized, the demands that the combustion flow field two-dimensional parameter measurement is realized by adopting a planar laser-induced technology are satisfied, the combustion flow field parameter measurement under the strong-vibration and strong-noise impact environment are simultaneously satisfied, and the environmental adaptability of the system is improved.

Description

technical field [0001] The invention belongs to the field of optical measurement, in particular to a laser diagnosis device for measuring combustion flow field parameters. Background technique [0002] Laser-induced fluorescence technology is a relatively advanced measurement technology in flow field diagnosis. Its basic principle is that molecules in the ground state transition to the excited state after resonantly absorbing photons of corresponding energy, and then radiate fluorescence while transitioning downward. [0003] The intensity of the fluorescent signal can be expressed by formula (1): [0004] I LIF =cnI L Φ (1) [0005] Among them, c represents the proportionality coefficient, n is the particle number of the detected particle at the specific energy level of the ground state, and I L represents the intensity of the excitation laser, and φ represents the quantum efficiency of the fluorescence. [0006] It can be seen from the above formula that the fluoresce...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a laser-induced fluorescence combustion field parameter measurement device, which overcomes the problem of low measurement accuracy of the two-dimensional parameters of the combustion field caused by the uneven distribution of the two-dimensional light intensity of the excitation laser in the existing measurement device, and satisfies strong vibration , The demand for two-dimensional parameter measurement of the combustion field under the impact of strong noise

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