EP0045898A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dual wavelength photometer with means for varying light signal wavelengths
Assignee: Vitafin NV
•
Filing: 1981-07-28
•
Granted: —
•
Expires: 2001-07-28
Abstract
Abstract An automated photometer is provided having a monochromator which generates light signals at least two controllable wavelength, for use in a dual wavelength analyzer system. Chopped light is alternately directed from two entrance slits 57 displaced from each other onto a fixed grating 60, thereby providing an alternating light source having light pulses at two defined wavelengths. The light signal is passed through one or more cuvettes 92A, 92B each containing a sample, and a photodetector 93A, 93B on the other side of the cuvette generates a periodic electrical signal representative of the absorbance of the test sample at the two defined wavelengths. An electronic processing channel 1, 2 is provided for each cuvette, adapted to process the periodic electrical signal which contains information derived at the two wavelengths and to provide output signals representative of the two absorbance values.
Inventors
- 👤 Johannes Harm Lukas Hogen Esch
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:37
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/28; G01J3/42
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
130 words
A plural wavelength photometer for producing a light signal having plural wavelength components, having an optical grating (60) for providing spectral dispersion of light incident thereon, characterized by: - one or more light sources (56) for directing incident light onto said grating from respective different angles; - light collecting means (62) for generating said plural wavelength light signal, comprising one or more light collectors for collecting light reflected from said grating, each of said one or more light collectors being positioned at a respective different angle relative to said grating; and - means (58) for positioning either said one or more light sources (56), or said one or more light collectors (62) relative to said fixed grating (60), whereby the discrete wavelength of the plural wavelength light signal are determined.
Claim 2
Dependent Claim
130 words
A plural wavelength photometer for producing a light signal having plural wavelength components, having an optical grating (60) for providing spectral dispersion of light incident thereon, characterized by: - one or more light sources (56) for directing incident light onto said grating from respective different angles; - light collecting means (62) for generating said plural wavelength light signal, comprising one or more light collectors for collecting light reflected from said grating, each of said one or more light collectors being positioned at a respective different angle relative to said grating; and - means (58) for positioning either said one or more light sources (56), or said one or more light collectors (62) relative to said fixed grating (60), whereby the discrete wavelength of the plural wavelength light signal are determined.
Claim 3
Dependent Claim
46 words
The photometer as described in claim 1, comprising means for moving (76 - 82) either said one or more light sources (56), or said one or more light collectors (62) relative to said grating, whereby the discrete wavelengths of the plural wavelength light signal are varied.
Claim 4
Dependent Claim
59 words
The photometer as described in claim 1, comprising a plurality of light sources (56) at respective positions; means (58) for directing said light sources (56) so that light signals therefrom are incident onto said grating (60), from which said light signals are reflected; and - said light collecting means comprising exit light means (62) for collecting said reflected signals.
Claim 5
Dependent Claim
119 words
The photometer as described in claim 3, for generating a light signal having alternating light pulses at two or more discrete wavelengths, further characterized by: - said plurality of light sources comprising - two light coupling means (54) for coupling light over a distance, each having an input (52) and an output (56) light source, and - light source means (46, 40) for providing light pulses alternately to said coupling means inputs, and - wherein said exit light means (62) generates a plural wavelength light signal by collecting light pulses reflected from said grating (60), said plural wavelength light signal having alternating wavelength components which are determined by the positions of said output light sources relative to said grating.
Claim 6
Dependent Claim
32 words
The photometer as described in claim 4, wherein said grating (60) is fixed in position, and said coupling outputs (56) are variable with respect to their angle of incidence upon said grating.
Claim 7
Dependent Claim
29 words
The photometer as described in claim 4, wherein said out- "put light sources (56) are variable in position along a constant radius from the center of said grating (60).
Claim 8
Dependent Claim
28 words
The photometer as described in claim 4, wherein said exit light means (62) comprises a light splitter (90) for splitting the plural wavelength light signal into two beams.
Claim 9
Dependent Claim
83 words
The photometer as described in claim 4, in combination with a cuvette (92A, 92B) adapted to hold a sample and a photodetector (93A, 93B), said exit light means (62), cuvette and photodetector being arranged in an optical path such that a light signal generated by said exit light means (62) is passed through said cuvette (92A, 92B) and focused upon said photodetector (93A, 93B), whereby the photodetector generates an electrical signal containing information representative of the absorbance of the sample in said cuvette.
Claim 10
Dependent Claim
49 words
The photometer as described in claim 8, comprising electric channel means (channels 1, 2) for processing the electric signal from said photodetector (93A, 93B) to obtain a signal representative of the absorbance of the sample in said cuvette (92A, 92B) at each of the wavelengthsof said plural wavelength signal.
Claim 11
Dependent Claim
35 words
The photometer as described in claim 4, having means for controlling the position of each of said.output light sources (56), whereby the two wavelengthsof the generated light signal are controllable over a predetermined wavelength range.
Claim 12
Dependent Claim
17 words
The photometer as described in claim 10, wherein said wavelength range includes ultraviolet, visible, and infrared light.
Claim 13
Dependent Claim
53 words
The photometer as described in claim 10, wherein said means for moving said light coupling outputs (56) comprises a motor (81) and a motor drive means (85) for controlling the position of said motor, said motor drive means being digital, whereby said light outputs are movable to programmed positions corresponding to programmed wavelengths.
Claim 14
Dependent Claim
19 words
The photometer as described in claim 1, comprising two movable light sources (56) and one fixed light collector (62).
Claim 15
Dependent Claim
27 words
The photometer as described in claim 13, comprising means (76) for controllably moving each of said light sources (56) at a constant radius to said grating (60).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.