Two-dimensional interferometric Rayleigh scattering velocimetry using multibeam probe laser

Abstract

Abstract. In order to achieve the two-dimensional (2-D) velocity measurement of a flow field at extreme condition, a 2-D interferometric Rayleigh scattering (IRS) velocimetry using a multibeam probe laser was developed. The method using a multibeam probe laser can record the reference interference signal and the flow interference signal simultaneously. What is more, this method can solve the problem of signal overlap using the laser sheet detection method. The 2-D IRS measurement system was set up with a multibeam probe laser, aspherical lens collection optics, and a solid Fabry-Perot etalon. A multibeam probe laser with 0.5-mm intervals was formed by collimating a laser sheet passing through a cylindrical microlens arrays. The aspherical lens was used to enhance the intensity of the Rayleigh scattering signal. The 2-D velocity field results of a Mach 1.5 air flow were obtained. The velocity in the flow center is about 450 m∕s. The reconstructed results fit well with the characteristic of flow, which indicate the validity of this technique.

Distributed optical fiber sensing technology in operation status monitoring of GIL equipment

“…By demodulating the light wave phase information, the change in the environmental parameters can be obtained, and several types of interferometric structures can demodulate the light phase. One of the more widely used is the twobeam interferometric system [16].…”

Quantitative gas property measurements by filtered Rayleigh scattering: a review

“…Though it is similar to FRS in many ways, the finer details of the experimental setup and signal interpretation of IRS are different enough that we consider it a separate technique. Interested readers are referred to [31][32][33][34][35] for a discussion of IRS. This article is organized as follows.…”