Apparatus for measuring light intensities
First Claim
1. Spectrophotometer apparatus comprising:
- a light source capable of providing a bright light of short duration for illumination of a sample;
sample light sensing means;
reference light sensing means;
a light reflective integrating sphere interposed between said light source and said sample and between said light source and said reference sensing means;
means establishing a first light transmission path for the passage of light from said sample to said sample light sensing means, wherein said means establishing a first light transmission path has a reflectance mode in which it directs light reflected from a sample to a sample light sensing means and wherein said means establishing a first light transmission path also has an alternate transmittance mode in which it directs light passing through a sample to said sample light sensing means;
means defining a second light transmission path for the passage of light from said light source to the reference light sensing means;
filter means in at least one of said first and second light transmission paths, said filter means permitting the transmission of light having a wavelength between about 200 and about 1100 nanometers; and
means for comparing the light received by the sample light sensing means with the light received by the reference light sensing means.
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Abstract
Apparatus for measuring reflected or transmitted light is described. The apparatus comprises filter type spectrophotometer having a wavelength range of from about 200 nm (nanometers) to about 1,100 nm which includes a sample illuminating light source capable of producing an extremely intense light of short duration; light diffusing means; a light filter for transmission of a selected wave-length; at least two independent light sensing means; and separate means defining light transmission paths for the passage of light from the light source to one light sensing means and from the illuminated sample to the other light sensing means.
In a preferred embodiment the apparatus includes a light diffusing integrating sphere. In another embodiment, a replaceable or repositionable module can be used to convert the apparatus from reflectance to transmittance spectrophotomer.
62 Citations
10 Claims
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1. Spectrophotometer apparatus comprising:
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a light source capable of providing a bright light of short duration for illumination of a sample; sample light sensing means; reference light sensing means; a light reflective integrating sphere interposed between said light source and said sample and between said light source and said reference sensing means; means establishing a first light transmission path for the passage of light from said sample to said sample light sensing means, wherein said means establishing a first light transmission path has a reflectance mode in which it directs light reflected from a sample to a sample light sensing means and wherein said means establishing a first light transmission path also has an alternate transmittance mode in which it directs light passing through a sample to said sample light sensing means; means defining a second light transmission path for the passage of light from said light source to the reference light sensing means; filter means in at least one of said first and second light transmission paths, said filter means permitting the transmission of light having a wavelength between about 200 and about 1100 nanometers; and means for comparing the light received by the sample light sensing means with the light received by the reference light sensing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification