Within the colorimeter
, the transmissive filters that create the XYZ tristimulus functions have spectral imperfections and will need to improve to make the colour measurement more accurate.
Once considered to be a niche area of optometry and viewed with scepticism by some, the use of a colorimeter
to prescribe precision tints to alleviate visual stress has become widespread, with more than 400 instruments in the UK and over 150 in many other countries in the world.
Prior to attempting the colorimeters
, all students assembled a simple night light circuit from a kit.
In vivo measurement of maxillary anterior teeth with a colorimeter
showed that; 1) tooth color was best represented by its middle third, 2) women's teeth in general were lighter, less chromatic, and less reddish colored than men's, 3) aging produced darker and more reddish teeth 4) cuspid teeth were darker than central or lateral incisors, and 5) central incisors had the highest lightness.
By equipping an integrating sphere with a number of LEDs having different spectral distributions and varying the radiometric output of the various LEDs, the sphere radiance can be tuned from the blue to the red, as well as tuned to approximate CIE-defined standard illuminant distributions (e.g., Illuminant A or D65), enabling calibrations of colorimeters
and spectro-radiometers against different spectral distributions.
and spectrophotometers ensure consistency for an important product parameter.
Colorimetric assays require a large sample volume, running of known standards, use of colorimeters
, plotting of standard curves and so forth.
Orbeco-Hellige's SC450 Series of single parameter colorimeters
test for a range of water quality parameters and are suited for use in either the field or laboratory.
were purchased by interested optometrists and some even made the journey of 3,000 miles from Perth in Western Australia.
that measure the absorbance of solutions are also referred to as photometers and are generally classified as a type of visible spectrophotometer.
And Minolta's new pair of hand-held colorimeters
(CR-400 and CR-410) have detachable, lightweight measuring heads (PT, June '03, p.