US 11,686,670 B2Granted

Isolation of fluid sample in multi-pass optical system

AssigneeYokogawa Electric Corporation

InventorAnatoliy A. Kosterev

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Abstract

Implementations are described herein for isolating mirrors and/or other potentially-vulnerable components of multi-pass optical systems from samples being analyzed, while mitigating interference and/or reduction in optical power. In one implementation, an apparatus may include: an optical cell with one or more passages, the one or more passages provided for introducing a sample into an interior of the optical cell for analysis and for removing the sample from the interior; a first mirror with a first reflective surface that faces the interior of the optical cell; one or more additional mirrors with one or more corresponding additional reflective surfaces that face the first reflective surface of the first mirror; and a wedge-shaped optical element positioned between the first mirror and the interior of the optical cell.

Claims17

Dependent claims

A multi-pass optical system comprising:

a hermetically-sealed optical cell to receive a fluid sample for multi-pass optical analysis;
two opposing wedged-shaped optical elements disposed on opposite ends of a section of the optical cell where the multi-pass optical analysis is performed, wherein the two opposing wedge-shaped optical elements are oriented so that a thicker end of a first of the two opposing wedge-shaped optical element and a thinner end of a second of the two opposing wedge-shaped optical elements are closer to each other than a thinner end of the first of the two opposing wedge-shaped optical element and a thicker end of the second of the two opposing wedge-shaped optical elements;
a field mirror with a first concave reflective surface that faces the interior of the optical cell;
a plurality of objective mirrors, each with a respective concave reflective surface that faces the first concave reflective surface of the field mirror;
a light source to emit light through the optical cell towards the concave reflective surface of one of the plurality of objective mirrors;
and
a light detector to detect light reflected from the concave reflective surface of another of the plurality of objective mirrors.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/088,150Filed 3 Nov 2020
Published: US 2022/0136962 A15 May 2022
Granted: 27 Jun 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01N 21/31
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands:…
G01N 21/031
Cuvette constructions: multipass arrangements
G01N 21/05
Cuvette constructions: flow-through cuvettes
G02B 1/11
Optical coatings produced by application to, or surface treatment of, optical elements: anti-reflection coatings