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用途： 測試固體、液體、粉體的顏色，色差；薄膜、鍍膜的厚度，紙張或者織物熒光反射率等 應(yīng)用：電子 化工 油墨 涂料 食品 啤酒 飲料 化妝品 調(diào)味品 薄膜 塑膠 建筑 教學(xué)等行業(yè) Universal Reflectance Measurements
The ReflectaScan Reflectance Spectrophotometer is designed as a universal reflectance measuring instrument capable of scanning samples over the wavelength range 190-1,100nm. An integral printer plots results and an external dot matrix or colour inkjet printer may be used if required.
Diffuse Reflectance Measurements
The integrating sphere system allows a range of measurements to be made.
Diffuse and specular samples
Total hemispherical reflectance
Specular excluded diffuse reflectance
Transmittance of turbid or scattering samples
Diffuse reflectance of powder samples
Diffuse Reflectance
The compact integrating sphere, which mounts within the instrument's sample compartment, is made from SpectralonTM which has the highest reflectance over the UV and visible region of any known substance. This gives high energy throughput resulting in excellent performance. The design is versatile, easy to use and allows for the elimination of substitution errors.
A 0° sample rest enables measurements to be carried out with the specular component eliminated. Substituted by a 11° sample rest, total hemispherical reflectance is measured.
A dedicated high performance SpectralonTM integrating sphere is used for diffuse reflectance and diffuse transmittance measurements. The sphere unit has its own silicon diode detector which uses a separate signal channel within the Spectrophotometer.
Turbid or Scattering Samples
The sphere unit is equipped with a 10mm pathlength cuvette holder so that transmittance measurements may be made for both turbid or normal samples. Scattering films may also be accommodated for measurement.
Specular Reflectance
A dedicated specular reflectance unit is used for specular reflectance measurements of surfaces and coated opthalmic lenses. The unit is ideal for quality assurance in the production of anti-reflection coated opthalmic lenses, many of these systems are now in use around the world.
Diffuse Reflectance of Samples
A scan is shown here of a poppy coloured paint sample from the Dulux paint range and also an overlay of scans for two blue paint samples each specified by its British Standard number shown on the chart.
Below is the reflectance scan of a plain white copy paper which shows a good flat response over the visible region, with fluorescence stimulated by UV radiation showing in the short wavelength region, but the origin of which is of longer wavelength.
All scans were made with the specular component excluded.
Coated Lens Reflectance
The optical performance of the anti-reflection coatings on opthalmic lenses is specifically catered for by the specular reflectance unit. A conical rest is provided to accommodate lenses up to 80mm diameter. Measurements are made with reference to an uncoated lens and the system is excellent for the production control of vacuum coated lenses. Many of these systems are now in everyday use.
Opthalmic Lens Transmission
The transmission characteristics of tinted opthalmic lenses may readily be measured using the CE 3077 lens mounting system. This allows the lens to be accurately centred on a carrier plate which is kinematically mounted on the body of the lens holder.
Measurement of Thin Films
Using the CE 3075 specular reflectance unit, the thickness of films deposited on a surface, for instance a epitaxial film of silicon dioxide on a silicon wafer, is readily measured.
The reflectance scan of such a film against wavelength produces a series of transmission maxima and minima due to the interference between energy reflected from the front surface of the film and that reflected from the interface between the film and its substrate.
Film thickness is calculated from an equation relating the number of peaks to their wavelength separation. Alternatively, ColourScan software may be used for automatic calculations.  Films down to about 0.1 microns in thickness may be measured.
A scan of a deposited film is shown here, the film thickness was calculated to be 1.05 microns.
Software is available (ColourScan), to enable a wide range of automatic calculations including tristimulus values, chromaticity, CIE L* A* B, CIE L* U* V, Hunter, metric colour, whiteness and yellowness.
Standard illuminant tables include CIE, A, B & C and CIE D50, D65 & D75. Observer tables include 2° and 10° angles.
Shown here is part of a complete printout from a light blue paint sample produced by the colour software programme.
Automatic Colour Measurements
DataStream software Specifications and Spectrophotometer Ordering

ReflectaScan Spectrophotometer
Each purchased Spectrophotometer is supplied complete with single cell holder, power cable, operators manual and short form instructions.
Specifications and Ordering of spectrophotometer and accessories
Optical Monochromator		Littrow using 1200 L/mm holographic grating
Optical Bandwidth		4nm
Wavelength Range and Accuracy		190-1100nm, better than ±1nm
Wavelength Reproducibility		±0.1nm
Self Test and Calibration		Automatic at switch on
Wavelength Scale Expansion		Selectable by keyboard entry 1-100nm/cm
Scan Speed		Selectable by keyboard entry 1-4000nm/min
Straylight		Typically <0.01% at 220nm and 340nm
Display Screen - Backlit LCD		Displays menus, plots etc with six screen widths of viewing.
Photometric Ranges		Digital display of -0.3-3A, 0-200%T, 0-9999C
Photometric Accuracy		±0.005A or 1% whichever is greater
Photometric Noise		Less than ±0.0002A (500nm)
Baseline Flatness		Better than ±0.002A most of range
Baseline Stability		Better than 0.001A/hour, 500nm
Overlayed Scans		Scans and derivatives with or without offset
Spectral Reprocessing		Scans manipulated and replotted over any range
Scan Storage		Up to 100 stored security code protected
Curve Fitting and Editing		Linear, quadratic or cubic; up to 30 standards
Cell and Wavelength Programming		Up to 8 cells and 10 wavelengths in any combination
Method Storage		Up to 30 methods stored in safe memory
Derivative Spectra		1st and 2nd derivatives
Peak Seek		Automatic search programme, baseline corrected
Time Course Plotting		Plots may be reprocessed and stored
Real Time Clock		Timed and dated reports
Computer/printer interfaces		Bi-directional serial RS232C and USB ports
Size & Weight		480 x 340 x 205mm, 19kg,
Power Requirements		110-250V, 50/60Hz, 170W