Analytical Instruments
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.
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 |
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