Cuvette for flow-type particle analyzer

1. An optical cuvette for use in a flow-type particle analyzer, comprising:

a cuvette block containing a sleeve channel extending through said cuvette block;

a flow tube adapted to be removably inserted into said sleeve channel of said cuvette block to form a slip-fit, wherein said flow tube contains a flow channel passing coaxially through said flow tube,

wherein at least a portion of said cuvette block and said flow tube are optically transmissive such that an excitation light can be transmitted through said cuvette block and flow tube to a detection region within said flow channel.

2. A flow-type particle analyzer, comprising:

an optical cuvette of claim 1 ;

excitation optics configured to transmit excitation light to a detection region located within said flow channel;

detection optics configured to detect light emitted from said detection region;

wherein said optical cuvette is fixed in position within said particle analyzer.

3. A flow-type particle analyzer of claim 2 , wherein at least one of said excitation optics and said detection optics is coupled to said optical cuvette.

4. An optical cuvette for use in a flow-type particle analyzer, comprising:

a cuvette block;

a sleeve tube passing through the interior of the cuvette block, containing a sleeve channel;

a flow tube adapted to be removably inserted into said sleeve channel of said cuvette block to form a slip-fit, wherein said flow tube contains a flow channel passing coaxially through said flow tube,

wherein at least a portion of said cuvette block, said sleeve tube, and said flow tube are optically transmissive such that an excitation light can be transmitted through said cuvette block and flow tube to a detection region within said flow channel.

5. An optical cuvette of claim 4 , wherein said cuvette block comprises

a tube-shaped body consisting of an optically transmissive solid, having a rectangular cross-sectional shape and having a first and a second end;

a top plate at the first end of said tube-shaped body; and

a bottom plate at the second end of said tube-shaped body;

wherein said sleeve tube passes through said top plate and said bottom plate such that the tube-shaped body, the top plate, the bottom plate, and the sleeve tube form a sealed interior cavity, and

an optically transmissive fluid contained in the sealed interior cavity, wherein the tube-shaped body, the sleeve tube, and the optically transmissive fluid have indices of refraction that are approximately the same.

6. A flow-type particle analyzer comprising, comprising:

an optical cuvette of claim 4 ;

excitation optics configured to transmit excitation light to a detection region located within said flow channel;

detection optics configured to detect light emitted from said detection region;

wherein said optical cuvette is fixed in position within said particle analyzer.

7. A flow-type particle analyzer of claim 6 , wherein at least one of said excitation optics and said detection optics is coupled to said optical cuvette.

8. A flow cell for use in a flow-type particle analyzer, comprising

(a) a flow cell chamber, comprising

a sample inlet port,

a sheath inlet port, and

a fluid exit opening; and

(b) an optical cuvette, comprising

a cuvette block containing a sleeve channel extending through said cuvette block;

and

a flow tube adapted to be removably inserted into said sleeve channel of said cuvette block to form a slip-fit, wherein said flow tube contains a flow channel passing coaxially through said flow tube,

wherein at least a portion of said cuvette block and said flow tube are optically transmissive such that an excitation light can be transmitted through said cuvette block and flow tube to a detection region within said flow channel;

wherein said fluid exit opening of said flow cell chamber is in fluid communication with said flow channel contained in said flow tube.

9. A flow cell of claim 8 , wherein said optically transmissive portion of said cuvette block has a rectangular cross-section.

10. A flow cell of claim 8 , additionally comprising a droplet generator adapted to vibrate at least one component of said flow cell.

11. A flow cell of claim 8 , additionally comprising a droplet generator adapted to vibrate fluid contained in said flow cell chamber.