Spectrophotometer - what is Spectrophotometer

  Prepared By : Mazadul Hasan sheshir ID: 2010000400008 13 th Batch (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 Prepared By :        Machine Name: Spectophotometer Brand Name: GretagMacbeth Model No: Color-Eye 7000A Origin: U.S.A [...]... expensive • Two beams reference as well as reflected analyses and it is compared with reference light • Spherical error can be minimized Dual beam spectrophotometer spectrophotometer 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) •... service centre • The availability of spare parts and facility with the supplier Spectrophotometer works on the basis of kubelka munk theory Software 01.Datacolor Tools ( DCT-Tools ) 02.Datacolor Match ( DCI –Match ) Parts of Spectrophotometer 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... 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 Maintenance of a spectrophotometer • Dust may change... 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 90o at each time 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... Gloss trap Monocromation • Prism • Wedge Type • Grating Photodetect • Silicone photodiodes (SPD) • Photomultipliers tube (PMT) Spectrophotometer 152 mm Diameter Integrating Sphere Reference Fibre Optic to MC90 Specular Port 8º S a m p l e 8º UV Filter Wheel D65 Filter Xenon Flash Lamp Sample Fibre Optic to MC90 Fully Automatic Zoom Lens Spectrophotometer Calibration of a spectrophotometer • Calibration... 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 Component used for calibration • White tile • Black trap • These values in advance stored in the software for comparison in each time How calibration is working... 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... 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) Description 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 . 2010000400008 13 th Batch (session 200 9-2 013) Department : Wet Processing Technology Email: mazadulhasan@yahoo.com Blog : www. Textilelab.blogspot.com (visit) Southeast University Department. 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