Photometric flow apparatus for small sample volumes and method of making same
First Claim
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1. Photometric apparatus for small sample volumes comprising:
- a cell body;
a light input means arranged adjacent a first surface of the cell body;
a light source for emitting light of predetermined wavelength or wavelength range through the light input means;
a light output means arranged adjacent a second surface of the cell body opposite to the first surface;
a light detector arranged adjacent the light output means; and
a flow channel formed in the cell body;
wherein surfaces of the walls of the channel have a roughness smaller than the predetermined wavelength or all wavelengths of the wavelength range of the source.
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Abstract
A photometric apparatus (100) for small sample volumes comprises a cell body (102), a light input means (104) arranged adjacent to a first surface of the cell body (102), a light source (105) emitting light of predetermined wavelength or wavelength range through the light input means (104), a light output means (106) arranged adjacent to a second surface of the cell body (102) opposite to the first surface, a light detector (107) arranged adjacent to the light out put means (104), and a flow channel (108) formed in the cell body (102), wherein surfaces of the walls of the channel (108) have a roughness smaller than the predetermined wavelength.
51 Citations
24 Claims
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1. Photometric apparatus for small sample volumes comprising:
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a cell body; a light input means arranged adjacent a first surface of the cell body; a light source for emitting light of predetermined wavelength or wavelength range through the light input means; a light output means arranged adjacent a second surface of the cell body opposite to the first surface; a light detector arranged adjacent the light output means; and a flow channel formed in the cell body;
wherein surfaces of the walls of the channel have a roughness smaller than the predetermined wavelength or all wavelengths of the wavelength range of the source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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- 16. A method of making a flow cell for use in liquid chromatography, the cell in use being responsive to optical energy having a predetermined wavelength or wavelength range, comprising determining the wavelength or wavelength range, forming in the cell an elongated flow channel for the liquid, the flow channel being arranged so in use of the cell the optical energy propagates and the liquid flows along the flow channel longitudinal axis, and machining and polishing the channel wall so the wall surface roughness has a value less than the determined wavelength or all wavelengths of the wavelength range of the source.
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18. Apparatus for use in spectroscopy analysis of small samples in liquid solution comprising
a source of optical radiation having a predetermined wavelength or range of wavelengths, radiation from the source being directed in a predetermined direction, an optical detector for radiation from the source, a photometric flow cell including first and second members forming a cell body, the cell body including a flow channel for the liquid, the flow channel including a first component extending in the predetermined direction, the first component of the flow channel being defined by a slit between opposed edges of first and second plates bonded to the cell body and opposed faces of the first and second members, the edges of the plates and the opposed faces defining the first component of the flow channel having a roughness smaller than the predetermined wavelength or all wavelengths of the wavelength range of the source, first and second windows transparent to optical radiation from the source bonded to the cell body so that optical radiation from the source propagates through the first window, thence through the slit, thence through the second window and thence to the optical detector, the channel including second and third components connected to opposite sides of the slit for respectively supplying the liquid solution to the slit and removing the liquid solution from the slit.
- 23. A method of making a photometric flow cell for use in spectroscopy analysis of small samples in liquid solution, the spectroscopy analysis being performed with an optical radiation source having a predetermined wavelength or range of wavelengths, the cell including first and second members having planar faces and a slit forming a component of a flow channel for the liquid sample, the method comprising polishing first and second edges of first and second plates so the edges have a roughness less than the predetermined wavelength or all wavelengths of the wavelength range of the source, then bonding faces of the plates to planar faces of the first and second members to form the slit of the flow channel for the liquid solution, then bonding windows transparent to the optical radiation to opposite faces of the members substantially at right angles to the flow direction of the liquid solution through the slit.
Specification