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Analytical Instruments


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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 USB 2.0 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.

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.

More +
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.

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 and Zoom lens

    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 USB 2.0 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 2.0
    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
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Established in 1993, Holmarc Opto-Mechatronics Ltd manufactures variety of scientific and engineering instruments for research, industry and education.

ISO 9001:2015 Made in INDIA

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    B.7., H.M.T. Industrial Estate H.M.T. P.O, Kalamassery, Kochi Kerala, India - 683 503
   +91 920-719-7772 / 6 / 1
   sales@holmarc.com
   Mon - Sat : 9 am to 5 pm

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