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Spectrophotometer

Presentation about 'Spectrophotometer'

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Spectrophotometer

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  1. Instruments for color measurement Spectrophotometer

  2. Prepared By : Prepared By : Mazadul Hasan sheshir ID: 2010000400008 13thBatch (session 2009-2013) Department : Wet Processing Technology Email: mazadulhasan@yahoo.com Blog : www. Textilelab.blogspot.com (visit) Southeast University Department Of Textile Engineering I/A 251,252 Tejgaon Dhaka Bangladesh

  3. Spectrophotometer is a device that measure the light intensities as a function of wave length. It does it by diffracting the light beam into a spectrum of wavelength, detecting the light intensities with charged couple device.

  4. Spectrophotometer

  5. Machine Name: Spectophotometer Brand Name: GretagMacbeth Model No: Color-Eye 7000A Origin: U.S.A

  6. Types • Colorimeter • Spectrophotometer – Single beam – Double beam

  7. Functions of Spectrophotometer 01.Color measurement & calculation 02.Recipe formulation & cost calculation 03.Quality Control management & shade sorting 04.Match prediction & color correction

  8. Spectrophotometer

  9. Working principle of a spectrophotometer

  10. Single beam Vs Dual beam Single beam • Old type • Cheap • Calibration tiles use as a standard light. • Spherical error can not be minimized. Dual beam • New type. • Relatively expensive. • Two beams reference as well as reflected analyses and it is compared with reference light. • Spherical error can be minimized.

  11. Dual beam spectrophotometer spectrophotometer

  12. Anatomy of a spectrophotometer • A source of light (Illuminant) • The way in which light is made to fall on the object. (optics and viewing geometry) • The method of dispersing the light into spectrum colors (monochromation) • The system of detecting the relative intensity of the reflected beam (photodetection)

  13. Illuminant 1. Tungsten halide lamps. 2. Xenon arc lamp. 3. Pulsed xenon arc lamp (PXA)

  14. Optics • Normal optics – Monochromate→ Reflect →Photodetect • Reverse optics – Reflect →Monochromate →Photodetect

  15. Viewing geometry The four CIE standard geometries are: 1. illumination at 45 degrees and light collection at the normal, 45/0; 2. normal illumination and light collection at 45 degrees, 0/45. 3. diffuse illumination and light collection at the normal, D/0; 4. normal illumination and diffuse light collection, 0/D

  16. Viewing geometry

  17. d/8ogeometry 8 8 GT L L = Lamp S = Sample GT = Gloss trap

  18. Monocromation • Prism • Wedge Type • Grating

  19. Photodetect • Silicone photodiodes (SPD) • Photomultipliers tube (PMT)

  20. Spectrophotometer 152 mm Diameter Integrating Sphere Reference Fibre Optic to MC90 Specular Port S a m p l e Sample Fibre Optic to MC90 8 º 8 º Fully Automatic Zoom Lens D65 Filter UV Filter Wheel Xenon Flash Lamp

  21. Spectrophotometer

  22. Calibration of a spectrophotometer • Calibration ensures repeatability result of a spectrophotometer. Before going for calibration we need to look out following matters – – Aperture size • LAV (25 mm) • MAV (10 mm) • SAV (5 mm) • USAV – Spcular component • Included • Excluded • Gloss – UV Filter • Included • Excluded

  23. Component used for calibration • White tile • Black trap • These values in advance stored in the software for comparison in each time.

  24. How calibration is working • In each time software calculates a correction factor A1 at all wavelengths. If there is also a zero offset correction at each wavelength A2 the software calculates the correct reflection factor Rc from each measured reflection factor Rm at all wavelengths. – Rc = RmA1 + A2 • This means that the displayed reflection factors Rc are all relative to a perfect diffuser with a 100% reflection at all wavelengths.

  25. Maintenance of a spectrophotometer • Dust may change the whiteness of sphere so keep the room dust free and time to time clean the sphere with a vacuum cleaner but keep in mind it should effect the color of the sphere. • Spectrophotometer should handle softly. • Proper electric stabilization is required. • During measure of sample, check it and it should be completely immaculate from undesirable material. • After procurement, it is necessary to verify its conformation to BCRA tile standard and it should be verified time to time by a professional.

  26. Sample measurement • Always measurement should be in such a way so that it should not be influenced by any back up material for this it may be fold four times. • For getting accurate result, measurement should be made four times for a sample by rotating 90oat each time.

  27. How to select a spectrophotometer • Purpose of such measurement. • Number of sample to be measured per shift. • Precision required. • Availability of professional person. • Distance between the dye house and instrument service centre. • The availability of spare parts and facility with the supplier

  28. Spectrophotometer works on the basis of kubelka munk theory

  29. Software 01.Datacolor Tools ( DCT-Tools ) 02.Datacolor Match ( DCI –Match )

  30. Parts of Spectrophotometer

  31. Purposes: •To collect recipe from Data Color. •To measure CMC difference. (Pass/Fail decision). •To give staining, wash fastness, light fastness result. •To know the metameric value & dye concentration. •To give topping recipe.

  32. Specifications: Feature Description Instrument Type Measurement Geometry Illumination Source Sphere Diameter Specular Port Spectral Analyzer Dual-beam spectrophotometer Diffuse illumination and 8° viewing Pulsed xenon filtered to approximate D65 152 mm / 6.0 in Automated included or excluded Proprietary SP2000 analyzer with dual 256 diode array and high resolution holographic grating No 360 nm to 700 nm 5 nm or 10 nm(1) 5 nm or 10 nm 0 to 200% High performance 0.01 (max) Transmittance Measurements Reporting Interval Effective Bandwidth Photometric Range Black Trap 20 Read Repeatability On The White Tile Using Dual Flash (CIELAB) Inter-instrument Agreement(2) for Reflectance (CIELAB) 0.15 (max) , 0.08 (avg.)

  33. Feature Description Lens Aperture plates for reflection measurements 4 position auto zoom 3 standard (LAV, SAV, USAV) 2 optional (XUSAV) 30 mm illuminated 26 mm measured 20 mm illuminated 16 mm measured 9 mm illuminated 5 mm measured 6.6 mm illuminated 2.5 mm measured 3.0 mm illuminated 2.5 mm measured Yes Yes Automatic UV calibration for the measurement of fluorescent Specimens with UV cutoff filters at 400 nm, 420 nm and 460 nm LAV MAV SAV USAV XUSAV(3) Reflection Aperture Plate Detection UV Calibration Automatic UV Control

  34. http://www.textilelab.blogspot.com (Visit My Blog for more Info ) My Facebook Textile related Pages 1. Yarn Manufacturing Technology Link : http://www.facebook.com/pages/Yarn-Manufacturing- Technology/485014954866808 2. Fabric Manufacturing Technology Link : http://www.facebook.com/pages/Fabric-Manufacturing- Technology/459520217425605 3. Garments Manufacturing Technology Link : http://www.facebook.com/pages/Garments-Manufacturing- Technology/472364799463126 3. Wet processing Technology Link : http://www.facebook.com/pages/Wet-Processing-Technology-Dyeing- /468645219825404 4. Fashion-Design-and-Technology Link : http://www.facebook.com/pages/Fashion-Design-and- Technology/587655294583875?ref=ts&fref=ts

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