Deflection-type refractometer with extended measurement range
A technology of measuring range and refractometer, applied in the field of refractometer, which can solve the problems of unstable source, prolonged stabilization time, drift, etc.
Pending Publication Date: 2021-03-26
聚合物表征股份有限公司
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Problems solved by technology
As a result, deflection-type detectors can only be used as differential index detectors that transmit refractive index data relative to other liquids, and they do not directly provide the absolute refractive index of the liquid based solely on the optomechanical structural details of the detector
[0012] Furthermore, the requirement for a reference liquid chamber results in prolonged stabilization times and is also a source of drift, instabilities, and adds considerable complexity to the system due to the need for means for purging the reference chamber with said reference liquid
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[0063] The present invention relates to a deflection-type refractive index detector with high precision and very large measurement range that can be used in liquid chromatography.
[0064] figure 1 Depicted is a deflecting refractometer 100 according to the prior art, wherein a light beam 102 is generated from a light source 110 and a slit 120 . The light beam 102 strikes a dual-chamber fluidic cell 130 comprising two triangular prisms, a reference chamber 132 and a sample chamber 134, which has an inlet and an outlet (not depicted) and is filled with different Reference liquid and flowing sample liquid with refractive indices n1 and n2. When the light beam passes through the fluid unit cell 130, according to the differential refractive index of the two liquids (Δn=n 2 -n 1 ) to deflect it by an angle α.
[0065] The deflected beam 104 is detected by a split photodiode 140 placed at a fixed distance L from the fluidic unit cell 130 . Specifically, the displacement d of th...
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Abstract
A deflection-type refractometer with extended measurement range, comprising: means for generating a beam of light (202); a measuring cell (230; 330) with a sample chamber (234; 334) for receiving a sample liquid, arranged such that a beam of light (202) from the light source (210) impinges on the sample chamber (234; 334) and is deflected after traversing two non- parallel faces (234a, 234b; 334a,334b) of the sample chamber (234; 334); an optical sensor mounted on a movable platform (240) for detecting the deflected beam of light (204); a driving unit (254) configured to move the platform (240); a distance measurement unit (260) for monitoring the displacement of the platform (240); a control unit (250) configured to calculate the deflection of the beam of light based on the displacementof the platform (240) and an output signal (244) of the optical sensor; and obtain a refractive index measure of the sample liquid using the calculated deflection.
Description
technical field [0001] The present disclosure relates to the field of refractometers, and more particularly to deflection-type refractive index detectors that obtain differential refractive indices by measuring the deflection of light beams at the interface of propagating media with different refractive indices. The invention can be used in liquid chromatography. Background technique [0002] The actual refractometers used in liquid chromatography are of the deflecting type, using split photodiodes to detect changes in position of the deflected image. This configuration has been shown to provide sufficient resolution and low noise, and continuously records the refractive index of the liquid flowing through the measurement cell to be used as an in-line detector in liquid chromatography applications. Alternative techniques (mainly based on critical angle detection) have been developed as commercial products for detecting the refractive index of bulk liquids, especially in the...
Claims
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IPC IPC(8): G01N21/41
CPCG01N21/4133G01N2021/4153G01N21/85G01N30/16G01N30/74G01N2030/027G01N2201/021
Inventor A·奥挺·塞巴斯蒂安B·蒙拉巴尔·巴斯
Owner 聚合物表征股份有限公司