Integrated Prototype of Flow Field Measurement System Based on Laser Absorption Spectroscopy

Abstract

The invention provides a flow field measurement system integrated model machine based on a laser absorption spectrum. The model machine comprises a tunable semiconductor laser, a laser control circuit, an optical fiber coupling apparatus, a photoelectric detector, a high speed signal acquisition and storage circuit and the like, wherein the tunable semiconductor laser, the optical fiber coupling apparatus and the photoelectric detector are commercial apparatuses; and the laser control circuit and the high speed signal acquisition and storage circuit are independently researched and developed to mainly realize the functions of emitting and controlling lasers and acquiring and storing signals and the like. The model machine is of a high integration density design, and the size of the whole model machine is 20cm*15cm*10cm, the weight is 2.6kg, and the maximum powder consumption is 25W. The model machine supports 16 measurement channels, data is stored online at a high speed, the total storage bandwidth is 160MByte / S, the data can be continuously stored for 26 minutes under the maximum bandwidth condition, and the acquisition rate of the channels can be dynamically configured independently.

Description

technical field [0001] The invention belongs to the technical field of flow field optical measurement, relates to tunable semiconductor laser absorption spectrum technology, in particular to an integrated prototype technology for laser absorption spectrum measurement. Background technique [0002] Advanced air-breathing engines and combined cycle engines have an important strategic position in future technological and military competitions, and are highly valued by aerospace and military powers. Engine flow field testing and diagnosis technology is the core technology accompanying the whole process of engine design, testing, monitoring and maintenance, and it is also one of the key technologies restricting the improvement of engine performance. The current engine flow field diagnosis mainly relies on the traditional contact measurement technology. With the deepening of the research on the combustion and propulsion flow field, the limitations of the contact measurement techno...

AI Technical Summary

Problems solved by technology

The current engine ground experiments generally use commercial devices, which can fully meet the measurement requirements in terms of functions, but there are still some problems: 1) Commercial devices generally have complex equipment, large volume and weight, and high prices; 2) Each device is independent and scattered, requiring Only a large space can be fully deployed, and sometimes the application in engineering environments is limited; 3) Due to the limitations of volume, weight and power consumption, current commercial devices cannot realize the flight application of the engine

The prototype of Document 1 has only two measurement channels, which cannot realize two-dimensional measurement; the prototype of Document 2 has 4 measurement channels, and the engine of HIFiRE 2 has 8 measurement channels, so two identical prototypes are needed; the measurement channel of Document 3 increased to 8, while the spatial resolution is still low for a typical engine size

[0012] 2) Storage bandwidth is generally low

Due to the limitation of storage bandwidth, the original measurement signal cannot be saved, and preprocessing is necessary to reduce the storage rate requirement

The engine test is a high-cost engineering test. Since the original measurement signal has high time resolution, it is very important for analyzing the detailed working conditions of the engine, capturing the transient process of the engine's operating conditions, ignition and flameout, etc., so the original measurement signal cannot be saved. Measurement signals reduce the validity of TDLAS measurements

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