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Schlieren Imaging System

with Independent Mounting System

Model: HO-SDIS-200B-IM
200 mm Dia. Parabolic mirrors
1500 mm focal length

Holmarc schlieren system contains, Two aluminized parabolic mirrors overcoated with silicon monoxide and mounted in gimbal mounts, pointed LED light Source, Knife edge adjuster and a 5MP USB3.0 digital camera. Camera is used for enabling a photographic record to serve as a permanent reference. For lower light intensities, a video camera and monitor combination may better enhance your total Schlieren system. Using video, your results are enlarged. Gimbal mounts for the parabolic mirrors eliminate unwanted linear beam translation during adjustment.

Schlieren imaging systems provide a powerful technique to visualize changes or non uniformities in refractive index of air or other transparent media. it is widely used in aeronautical engineering to photograph the flow of air around objects. Applications for the Schlieren system include: the determination of refractive index, wind tunnel research, fluid and air current flow, internal character of glass, flame analysis, sound velocity and the mass of microscopic particles.

Small scale unevenness that are commonly measured with interferometers or similar high sensitivity methods can also be tested with schlieren setups. Any inhomogeneities of the surface in a transparent material can be visualised with a schlieren setup. The small bumps or irregularities in the structure cause the same deviation of the light as in fluids.



Features

    Wind tunnel research

    Fluid and air current flow

    Internal character of glass

    Flame analysis

    Ultrasound visualization

    Heat convection visualization



Schlieren Imaging System is beneficial to use in fluid dynamics studies because they are sensitive to changes and do not interfere with flow. They are also used to study optical media and changes in refractive index within the material. Most commonly, schlieren systems have been applied to visualize diverse subjects such as striations in blown glass, inhalation in humans and animals, shock waves from a plane in flight, and heat emanating from a system.

Another important schlieren application is heat convection visualization. Mainly energetic questions as the thermic flux in buildings are answered with the schlieren method. An interesting example are the agricultural tests of thermal convection as seen in figure. Even small scale thermic convection on plants has been possible to visualize.

Components

1.    Parabolic Mirrors

2.    Gimbal Mirror Mount for Parabolic Mirrors

3.    Imaging zoom Lens

4.    5MP USB3.0 CMOS camera

5.    Knife Edge with positioning mount

6.    LED point light source with variable power supply and condenser optics

7.    Platform for mounting Knife edge, zoom lens and camera

8.    Image grabbing software

9.    Viewing screen

Parabolic Mirrors

    Diameter :     200 mm, Focal length = 1500 mm
    Surface quality :     40 - 20 (Scratch-dig)
    Material :     Borofloat, Coating = Protected aluminium
    Reflectivity Ravg :     2> 88% @ 450 - 2000 nm

Gimbal Mirror Mount for Parabolic Mirrors

    Coarse travel :     360 degree
    Fine travel :     +/- 6 degree
    Travel range :     360 degree
    Linear resolution :     0.01 mm (Least count for micrometer)
    Sensitivity :     4 arc sec
    Mounting holes :     M6 slots
    Construction material :     Aluminium alloy
    Finish :     Black anodized
    Optical axis height from the floor :     1.41 meter
    Height adjustment :     200 mm
    Height adjustment mechanism :     Manual coarse height adjustment with lock knob
    Height adjustment mechanism Material :     Mild Steel
    Foot leveling :     with leveling screws
LED point light source with variable power supply and condenser optics

    LED :     3W high bright White
    Intensity :     Adjustable
    Condenser Optics :     Multi-element design
    Optical axis height from the floor :     1.41 meter
    Height adjustment :     200 mm
    Height adjustment mechanism :     Manual coarse height adjustment with lock knob
    Height adjustment mechanism Material :     Mild Steel
    Foot leveling :     with leveling screws
Platform for mounting Knife edge, Zoom lens and Camera

    Optical axis height from the floor :     1.41 meter
    Height adjustment :     200 mm
    Height adjustment mechanism :     Manual coarse height adjustment with lock knob
    Height adjustment mechanism Material :     Mild Steel
    Foot leveling :     with leveling screws
5MP USB3.0 CMOS camera

    Sensor :     CMOS, Color, 5 Mp
    Optical format :     1 / 2.5”
    Active imager size :     5.70 mm x 4.28mm (7.13mm diagonal)
    Pixel size :     2.2 um x 2.2 um
    Frame rate :     8 fps @ full resolution
    Sensitivity :     1.76 V / Lux - sec
    Exposure time :     109 us - 3000 ms
    Spectral range :     380 - 650 nm
    SNR :     38.5 dB
    Dynamic range :     67.7 dB
    Shutter :     Electronic rolling shutter
    Data interface :     USB 3.0
    Software interface :     TWAIN / DirectShow
    Operating mode :     Continuous output
    Data format :     8 Bit / 12 Bit RAW
    Picture format :     JPEG / BMP / PNG / RAW
Viewing screen

    Optical axis height from the floor :     1.41 meter
    Height adjustment :     200 mm
    Height adjustment mechanism :     Manual coarse height adjustment with lock knob
    Height adjustment mechanism Material :     Mild Steel
    Foot leveling :     with leveling screws

Airflow around the leafs of a corn plant is visualized using schleren imager for agronomical research.


A model green house section with the heat convection produced by the sun light heat.

Optional Features

Custom Sizes & Lens Based Schlieren Imaging System


To visualize instantaneous density profiles, a short duration flash rather than continuous illumination can be used (Flash lights can be provided on request).

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