A very low-density flow field schlieren measurement system and method based on a programmable spatial light modulator

A spatial light modulator and extremely low-density technology, which is applied in the testing of machines/structural components, measuring devices, instruments, etc., can solve the problems of not being able to clearly capture shock waves in low-density flow fields

Active Publication Date: 2022-05-24
四川欧瑞特光电科技有限公司
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Problems solved by technology

[0013] In order to solve the problem that the existing schlieren method cannot clearly capture the low-density flow field shock wave, a very low-density flow field schlieren measurement system and method based on a programmable spatial light modulator are provided, which can measure the air density below The flow field shock wave under the condition of 10Pa is measured

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  • A very low-density flow field schlieren measurement system and method based on a programmable spatial light modulator
  • A very low-density flow field schlieren measurement system and method based on a programmable spatial light modulator
  • A very low-density flow field schlieren measurement system and method based on a programmable spatial light modulator

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[0041] The present invention will be further described below with reference to the embodiments, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other used embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] combined with figure 1 , with figure 1 The schlieren light path diagram of the reflective parallel light schlieren in the prior art is shown, and the schlieren light path includes a point light source 01, a first reflector 02, two optical glasses 03, a second reflector 05, and a knife edge 06 and a camera 07, wherein an isolation section 04 (or referred to as a flow field observation area) is formed between the two optical glasses 03, and an object is used in the isolation section 04, and an airflow is applied to the object in the isolation sectio...

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Abstract

The invention belongs to the technical field of schlieren measurement and imaging, and discloses an extremely low-density flow field schlieren measurement system and method based on a programmable spatial light modulator, in order to solve the problem that the prior art cannot clearly capture low-density flow field shock waves . When the optical signal of the present invention is focused on the programmable spatial light modulator through the first focusing mirror, the programmable spatial light modulator is programmed and controlled by the image fed back by the first CCD image sensor, so that the programmable spatial light modulation The device deflects the brighter low-frequency part of the focused spot, leaving the darker high-frequency part and reflecting it to the second focusing mirror, and then focusing on the second CCD image sensor through the second focusing mirror to achieve low-density flow Imaging observation of field shock images. The invention can detect the signal of several nanometers by filtering out the relatively bright low-frequency part in the light spot, and realizes the detection of the schlieren shock wave in the extremely low-density flow field.

Description

technical field [0001] The invention belongs to the technical field of schlieren measurement and imaging, and in particular relates to a very low density flow field schlieren measurement system and method based on a programmable spatial light modulator. Background technique [0002] The schlieren imaging technology uses the disturbance of the airflow to the light wave to convert the airflow change into an image, that is to say, the principle of the schlieren to capture the flow field is to display its refractive index according to the angular deflection of the light passing through the airflow of different densities. It is a device for measuring the slight deflection angle of light, which converts the change of density gradient in the flow field into the change of relative light intensity on the recording plane, so that the areas with severe density changes such as shock waves and compression waves in the compressible flow field become compressible. Observe, distinguishable ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M10/00
CPCG01M10/00
Inventor 范松如胡冬霞王玉鲁范朦陈冬晖
Owner 四川欧瑞特光电科技有限公司
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