Devices, systems, and methods for detecting odorants
US-2015377835-A1 · Dec 31, 2015 · US
Method for measuring the properties of liquid based on a quartz crystal microbalance sensor
US10145819B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10145819-B2 |
| Application number | US-201514933648-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 5, 2015 |
| Priority date | Apr 23, 2015 |
| Publication date | Dec 4, 2018 |
| Grant date | Dec 4, 2018 |
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Abstract
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The present invention provides a method for a method for measuring the properties of liquid based on a quartz crystal microbalance sensor, which employs two measurements to obtain two frequency shifts of the QCM sensor induced by two different volume of the sample liquid. The present invention creatively established the relationship between the density and viscosity of sample liquid and the frequency shifts of QCM sensor. With present invention, the density and viscosity of sample liquid can be obtained through two frequency shifts. Comparing to the conventional liquid property measurement. The measuring procedure of present invention are more simple, and the measuring results are more accurate. Moreover, the present invention consumes less volume of sample liquid, and has the features such as online, real time and quantitative.
First claim
Opening claim text (preview).
What is claimed is: 1. A method for measuring the properties of a liquid based on a quartz crystal microbalance (QCM) sensor, the method comprising: connecting the QCM sensor to a driving circuit, the driving circuit being connected to a direct current (DC) power supply, and the output of the driving circuit being connected to a frequency counter; recording a first counting value displayed on the frequency counter, after the DC power supply is powered on, and the QCM sensor begins to work, the first counting value being a reference resonant frequency f 0 of the QCM sensor; after a certain amount of a sample liquid has been loaded onto the QCM sensor's surface, where a volume of the sample liquid is V L1 , recording a second counting value displayed on the frequency counter, where the second counting value is a first resonant frequency f 1 of the QCM sensor, and a first frequency shift is Δf 1 =f 1 −f 0 ; after another certain amount of the sample liquid is loaded onto the QCM sensor's surface, where a volume of the sample liquid is V L2 , recording a third counting value displayed on the frequency counter, the third counting value being the second resonant frequency f 2 of the QCM sensor, and the second frequency shift being Δf 2 =f 2 −f 0 ; when the volume of the sample liquid varies from V L1 to V L2 , a difference between the second frequency shift and the first frequency shift of the QCM sensor is Δf 2 −Δf 1 ; calculating a density of the sample liquid ρ L based on the formula: ρ L = Δ f 2 - Δ f 1 K Pf · C Pf · V L 2 · f 0 , where C Pf is a pressure-frequency constant, K Pf is the pressure sensitivity coefficient of the QCM sensor, which is obtained based on the following formula: K pf =f 0 ·K f /nD, where n is an overtone number of the QCM sensor's electrode, D is a diameter of the QCM sensor's electrode, K f is a force-frequency constant of the QCM sensor; and calculating the viscosity of the sample liquid η L based on the following formula: η L = K Pf · C Pf ( Δ f 2 - Δ f 1 ) · V L 2 · f 0 · [ Δ f 1 · V L 2 - V L 1 · ( Δ f 2 - Δ
Assignees
Inventors
Classifications
Resonance or resonant frequency · CPC title
- G01N29/022Primary
Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices (microdevices per se B81B) · CPC title
Density, viscosity · CPC title
with a reference signal (amplitude comparison G01N29/48) · CPC title
Bulk waves, e.g. quartz crystal microbalance, torsional waves · CPC title
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- What does patent US10145819B2 cover?
- The present invention provides a method for a method for measuring the properties of liquid based on a quartz crystal microbalance sensor, which employs two measurements to obtain two frequency shifts of the QCM sensor induced by two different volume of the sample liquid. The present invention creatively established the relationship between the density and viscosity of sample liquid and the fre…
- Who is the assignee on this patent?
- Univ Electronic Sci & Tech China
- What technology area does this patent fall under?
- Primary CPC classification G01N29/022. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Dec 04 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).