Flow cell for fiber optic spectrometers and photometers

A flow cell comprising:

• a first stream coupler, said first stream coupler comprising a first main body having a first hollow internal volume therein and a first connector having a first orifice therein, wherein fluid flows from said first orifice into said first hollow internal volume and vice-versa;
• a second stream coupler, said second stream coupler comprising a second main body having a second hollow internal volume therein and a second connector having a second orifice therein, wherein fluid flows from said second orifice into said second hollow internal volume and vice-versa;
• a first seal positioned on an end of said first hollow internal volume and including a first light window capable of transmitting light into and out of said first hollow internal volume;
• a second seal positioned on an end of said second hollow internal volume and including a second light window capable of transmitting light into and out of said second hollow internal volume;
• a hollow spacer between said first hollow internal volume and said second hollow internal volume;
• an input, for directing light into said first hollow internal volume;
• and a detector, for detecting light exiting from said second hollow internal volume, said input and said detector together forming a sensor;
• wherein, said first stream coupler is arranged adjacent to said second stream coupler so such that fluid flows from said first orifice through said first hollow internal volume and through said hollow spacer, to said second hollow internal volume and to said second orifice;
• and
• wherein light passes from said input, through said first light window, through said first hollow internal volume and said hollow spacer, through said second hollow internal volume, and through said second light window before being detected by said detector.