Method and device for measuring minute volume of liquid

a technology of liquid droplets and liquid droplets, which is applied in the direction of volume measurement, liquid/fluent solid measurement, instruments, etc., can solve the problems of limiting the precision of graduated containers, affecting the accuracy of liquid droplets, etc., and achieves the effect of limiting the scope of invention

Inactive Publication Date: 2020-03-12
BRIGHTON TECH
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  • Abstract
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Benefits of technology

[0006]In another embodiment, the test apparatus images the drop. In another embodiment, the test apparatus measures a dimension of height or diameter of the drop or both. In another embodiment, the test apparatus determines a volume of the drop of liquid from the relationship of the contact angle to one or more parameters selected from the group consisting of the maximum height, the diameter of

Problems solved by technology

These methods are less convenient for small volumes of liquid.
The precision of a graduated container is limited by the subjectivity of the measurement proc

Method used

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  • Method and device for measuring minute volume of liquid
  • Method and device for measuring minute volume of liquid
  • Method and device for measuring minute volume of liquid

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Embodiment Construction

[0012]A liquid drop, when deposited onto a surface and allowed to come to equilibrium, forms a symmetrical shape that is determined by the balance of several forces: the liquid surface tension, the solid surface energy, the gravitational force on the liquid, and the strength of attraction between the liquid and the surface on which it rests. If the drop is small, gravitational forces are small in relation to the surface and interfacial tensions and can be ignored. In this case the drop assumes a spherical shape, and the shape of the drop is defined by the contact angle θ. This is the angle between the surface and a tangent to the drop at the point of intersection of the drop with the surface. The contact angle is defined as the angle formed by the intersection of the liquid-solid interface and the liquid-vapor interface (geometrically acquired by applying a tangent line from the contact point along the liquid-vapor interface in the droplet profile). The interface where solid, liquid...

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Abstract

A method and test apparatus determines a volume of a droplet of liquid. The test apparatus deposits a drop of liquid to be measured on a surface that provides a known contact angle with the liquid under the deposition conditions used, thereby establishing one of: (i) an advancing, (ii) a receding, and (iii) an intermediate contact angle. The test apparatus images the drop. The test apparatus measures a dimension of height or diameter of the drop. In one embodiment, the test apparatus calculates a volume of the drop of liquid from the relationship of the contact angle to one or more parameters selected from the maximum height, the diameter of the contact patch, the radius of curvature, or the cross sectional area of the drop.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority under 35 U.S.C. § 119(e) to U.S. Patent Application Provisional Application Ser. No. 62 / 502,024 entitled “METHOD AND DEVICE FOR MEASURING MINUTE VOLUME OF LIQUID”, filed May 5, 2017, and to PCT Application No. PCT / US2018 / 031100 entitled “METHOD AND DEVICE FOR MEASURING MINUTE VOLUME OF LIQUID,” filed May 4, 2018, both of which are hereby expressly incorporated by reference herein for any purpose.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The field of art disclosed herein pertains generally relates to a device and method to dispense small droplets of liquid, and more particularly to measuring the volume of dispensed droplets.2. Description of the Related Art[0003]Liquid volumes may be measured in several ways. A graduated cylinder or pipette may be used to directly measure a liquid volume. Alternatively, the mass of a quantity of a liquid may be measured and then divided by the...

Claims

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Application Information

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IPC IPC(8): G01F22/02G01B11/08G01B11/255G06T7/62
CPCG01B11/255G01B11/08G01F22/02G06T7/62G01F22/00G01N35/1016B41J2/2142G01B11/0608G01F25/0092G01F25/0084G01N2013/0208G01N21/8507
Inventor DILLINGHAM, RAYMOND GILESGEREN, MICHAEL ANTHONYGILPIN, ANDREW DAVISONBARRY, TIMOTHY JAMES
Owner BRIGHTON TECH
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