High pressure fluorescence flow-through cuvette

• US 4,088,407 A
• Filed: 07/09/1976
• Issued: 05/09/1978
• Est. Priority Date: 03/13/1974
• Status: Expired due to Term

• Current Assignee: ABI Analytical Incorporated
• Original Assignee: Schoeffel Instrument Corporation
• Inventors: Sonnenschein, Armin K., Schoeffel, Dietmar M.
• Primary Examiner(s): Evans, F. L.
• Application Number:
  US05/703,788
• Time in Patent Office: 669 Days
• Field of Search: 356/85, 356/75, 356/103, 356/104, 356/244, 356/181, 356/246, 250/574, 250/576
• US Class Current: 356/317
• CPC Class Codes: G01J 1/36 using electric radiation detectors
• CPC Class Codes: G01J 3/0256 Compact construction
• CPC Class Codes: G01N 2021/0346 Capillary cells; Microcells
• CPC Class Codes: G01N 2021/1748 Comparative step being essential in the method
• CPC Class Codes: G01N 2021/6469 Cavity, e.g. ellipsoid
• CPC Class Codes: G01N 2021/6482 Sample cells, cuvettes
• CPC Class Codes: G01N 2030/746 detecting along the line of flow, e.g. axial
• CPC Class Codes: G01N 21/0303 Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment G01N21/031 - G01N21/15 take precedence
• CPC Class Codes: G01N 21/05 Flow-through cuvettes G01N21/09 takes precedence; handling fluid samples G01N1/10
• CPC Class Codes: G01N 21/314 with comparison of measurements at specific and non-specific wavelengths dual wavelength spectrometry G01J3/427
• CPC Class Codes: G01N 21/64 Fluorescence; Phosphorescence
• CPC Class Codes: G01N 21/645 Specially adapted constructive features of fluorimeters
• CPC Class Codes: G01N 30/74 Optical detectors measurement of intensity, velocity, spectral content, polarisation, or phase of infrared, visible or ultraviolet light G01J

Abstract

A cuvette for liquid chromatographic analysis and like determinations having a chamber through which the liquid being analyzed flows, a single optical body for directing exciting light to the chamber and emitted light to a detector and means for holding the optical body in intimate contact with the chamber.

Claims

1. A cuvette for liquid chromatographic analysis wherein light from a light source is directed to a sample of a liquid in the cuvette and a maximum amount of light scattered by the liquid is collected from said cuvette comprising:

an optically clear chamber adapted to contain therein the sample of the liquid and disposed to receive light from the light source;

entrance means and exit means connected to the chamber to permit the liquid to flow therethrough;

a solid block of light transparent material in the shape of a solid of revolution having a curved light directing surface generated by a curve having a configuration and placement relative to the chamber such that said maximum amount of light scattered by the liquid in the chamber is collected and directed in a specific direction; and

a reflective material on the light directing surface of the solid block for reflecting essentially all of the light at that surface to maximize the amount of optical energy directed in the specific direction.

2. The cuvette of claim 1 wherein:

the chamber is elongated and its axis is in alignment with the light from the light source.

3. The cuvette of claim 2 including:

a mask at the end of the elongated chamber opposite the end at which the light from the light source enters the elongated chamber.

4. The cuvette of claim 1 wherein:

the chamber is elongated;

the light directing surface of the solid block of transparent material is spaced from the optically clear chamber and the solid block has a flat surface which is adjacent the optically clear chamber;

the reflective material is a coating on the outer curved light directing surface of said block, said reflective coating having an opening therein to permit the light from the light source to pass therethrough and impinge on the liquid in the optically clear chamber.

5. The cuvette of claim 4 including:

holding means for holding the flat surface of the optical body in intimate contact with the outer surface of the elongated chamber.

6. The cuvette of claim 5 wherein the holding means comprises:

a housing having two elements having mating threads;

a resilient pad surrounding the opening in the reflective coating;

a bar, the elongated optically clear chamber being embedded in the bar so that a portion of its surface is exposed;

the mating threads being engaged such that the resilient pad is in contact with one element of the housing and the curved surface of the solid body and the other element of the housing is in contact with the flat surface of the solid block;

the other element of the housing having opposed keyways therein to receive the ends of the bar;

the bar being rotated into position wherein it is out of alignment with the keyways;

holding means for holding the bar in this out of alignment position such that the elongated optically clear chamber is in contact with the flat side of the solid block.

7. The cuvette of claim 1 wherein:

the optically clear chamber is partially embedded in the solid block with its axis in a radial direction with respect to the block.

8. The cuvette of claim 7 including:

a quartz window adjacent one end of the optically clear chamber to direct the light from the light source therein.

9. The cuvette of claim 8 including:

a shutter at the end of the optically clear chamber opposite the quartz window movable between a first position wherein the light entering the chamber passes therethrough and a second position wherein the light entering the chamber is precluded from passing therethrough and is reflected by the reflective material.

10. The cuvette of claim 7 wherein:

the optically clear chamber is completely embedded in the solid block.

11. The cuvette of claim 10 including:

a quartz window adjacent one end of the optically clear chamber to direct the light from the light source therein.

12. The cuvette of claim 11 including:

a shutter at the end of the optically clear chamber opposite the quartz window movable between a first position wherein the light entering the chamber passes therethrough and a second position wherein the light entering the chamber is precluded from passing therethrough and is reflected by the reflective material.

13. The invention of claim 1 including:

a second solid block of light transparent material having a curved surface generated by a curve;

both solid blocks of light transparent materials having reflective material on at least a portion of their curved surfaces;

the solid blocks having flat surfaces placed in juxtaposition;

a pair of mating sections placed to hold the said flat surfaces in position;

the chamber being embedded in one of said mating sections;

a photodetector mounted in the other mating section;

the blocks being positioned such that light from the light source excites the contents of the chamber which contents fluoresce and the said fluorescent light is directed by the reflective material on both solid blocks to the photodetector.