CN113324875A - Photoresist type liquid viscosity measuring device - Google Patents
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- CN113324875A CN113324875A CN202110529834.1A CN202110529834A CN113324875A CN 113324875 A CN113324875 A CN 113324875A CN 202110529834 A CN202110529834 A CN 202110529834A CN 113324875 A CN113324875 A CN 113324875A
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
- G01N11/06—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by timing the outflow of a known quantity
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Abstract
The invention provides a photoresistance type liquid viscosity measuring device, comprising: the device comprises a chip substrate, a detection chip embedded in the chip substrate, an excitation unit connected with the detection chip, a signal acquisition unit electrically connected with the excitation unit and a calculation unit; the excitation unit outputs stable direct current to excite the detection chip; when standard spherical particles in the liquid to be detected pass through the detection chip, voltage signals are generated, the voltage signals are collected by the signal collecting unit and are transmitted to the calculating unit, and the calculating unit calculates viscosity data of the liquid to be detected. The detection chip comprises a plurality of light resistance sensing units; each light resistance sensing unit comprises a light transmitter and a light receiver which are vertically arranged on two sides of the micro-channel in an opposite mode. The invention utilizes the principle of light resistance effect to detect the voltage pulse signals passing through a plurality of light resistance sensing units, determines the acceleration of standard spherical particles in the liquid to be measured through algorithm processing, measures the viscosity of the liquid to be measured in real time, eliminates measurement errors and avoids the artificial influence in the process of measuring the viscosity of the liquid.
Description
Technical Field
The invention relates to the technical field of liquid viscosity measurement, in particular to a light resistance type liquid viscosity measuring device.
Background
Viscosity is a physical and chemical property of fluid, and due to the action of viscosity, an object can be subjected to pressure difference resistance and frictional resistance when moving in the fluid, so that the viscosity of the fluid can represent the flowing state of the fluid, and the fluid can be widely applied to the fields of petroleum, chemical engineering, traffic, biomedicine and the like. For example, in a hydraulic and lubricating system of mechanical equipment, the viscosity of oil changes with the temperature of oil in the system, and is influenced by properties such as the property and concentration of pollutants in the system, and is an important physical property of the oil, so that the viscosity can be regarded as a key index for judging the operation degradation of the oil and judging whether the system is in operation failure or not.
When the viscosity of oil liquid in the system is too low, the strength of the oil film between the friction pairs is reduced, boundary friction is formed, and further the abrasion between the friction pairs is aggravated; when the viscosity of oil in the system is overlarge, the marker oil is excessively oxidized and decayed, so that the friction resistance is increased, and the abrasion between friction pairs is aggravated. By measuring the viscosity of the oil, the oil state can be directly monitored, the running state of the system can be judged, the major accident can be pre-judged, the major economic loss can be avoided, and the operation cost of mechanical systems in the fields of shipping, aerospace and the like can be reduced.
Currently, the mainstream measurement methods in the field of liquid viscosity detection include a drum method, a capillary method, a ball drop method, and the like. The uniform speed section of the rotating drum method is not easy to determine, so that the error of experimental data is large; when the capillary diameter is small and the viscosity of the measured liquid sample is too high, the measurement results will have large errors. The falling ball method is used for calculating the viscosity of the liquid to be measured by measuring the speed of a ball body in the liquid to be measured as a free falling body, but instruments such as a stopwatch and the like are required, so that the falling ball method is not suitable for real-time detection and has large human influence factors.
Disclosure of Invention
According to the technical problems that the manual influence is large, the error of experimental data is large, the system design is complex, and real-time detection cannot be realized, and the laser adjustment problem in the viscosity measurement process in the prior art, the photoresist type liquid viscosity measurement device is provided. The invention mainly utilizes the principle of light resistance effect to detect the voltage pulse signals passing through a plurality of light resistance sensing units, determines the acceleration of standard spherical particles in the liquid to be measured through algorithm processing, measures the viscosity of the liquid to be measured in real time, greatly eliminates measurement errors and avoids artificial influence in the process of measuring the viscosity of the liquid.
The technical means adopted by the invention are as follows:
a photoresist-type liquid viscosity measuring device comprising: the chip comprises a chip substrate, a detection chip embedded in the chip substrate, an excitation unit connected with the detection chip through a lead, a signal acquisition unit electrically connected with the excitation unit and a calculation unit; the excitation unit outputs stable direct current to excite the detection chip; when standard spherical particles in the liquid to be detected pass through the detection chip, voltage signals are generated, the generated voltage signals are collected by the signal acquisition unit and are transmitted to the calculation unit, and the calculation unit calculates viscosity data of the liquid to be detected.
Further, the chip matrix is formed by casting liquid, and a liquid inlet, a micro-channel, a standard spherical particle adding port, a liquid storage tank and a liquid outlet are sequentially embedded in the chip matrix by adopting a molding method; the liquid inlet, the standard spherical particle adding port, the liquid storage tank and the liquid outlet are communicated with the micro-channel; and the liquid to be detected flows into the micro-channel from the liquid inlet, flows out from the liquid outlet after detection and flows to the liquid storage tank.
Further, the detection chip comprises a plurality of light resistance sensing units; the structure of each light resistance sensing unit is the same, the arrangement positions are different, and each light resistance sensing unit comprises a light emitter and a light receiver which are vertically arranged on two sides of the micro-channel in an opposite mode.
Furthermore, the light resistance sensing units are connected with the lead terminals of the signal acquisition units in parallel, and the signal acquisition units are used for acquiring voltage signals when the standard spherical particles pass through each light resistance sensing unit and displaying all the voltage signals in the same voltage signal diagram.
Further, the optical transmitter transmits laser to the micro-channel perpendicular to the optical receiver; the optical receiver converts the received optical signal into an electrical signal and transmits the electrical signal to the signal acquisition unit.
Further, the photoresistance type liquid viscosity measuring device also comprises a driving device, and the driving device is arranged at the liquid inlet and is used for providing constant driving force for the liquid to be measured to flow in the micro-channel.
Further, the standard spherical particle adding port is used for injecting standard spherical particles into the liquid to be detected in the micro-channel; standard spherical particles employ a non-transparent medium for blocking a portion of the laser light emitted by the light emitter.
Compared with the prior art, the invention has the following advantages:
the light resistance type liquid viscosity measuring device provided by the invention can improve the detection sensitivity of the liquid viscosity, largely avoids the artificial influence of viscosity measurement, reduces the error of experimental data, overcomes the problem of low experimental success rate when the traditional laser ball falling method is used for detecting the viscosity, realizes the real-time monitoring of the liquid viscosity, and has simple system design and simple and convenient operation. The liquid viscosity detection device is applied to the field of oil liquid detection, and can improve the detection sensitivity of oil liquid viscosity, thereby accurately detecting the state of oil liquid, prejudging the occurrence of mechanical equipment faults and reducing the maintenance and operation cost of a system containing hydraulic oil and lubricating oil.
Based on the reasons, the invention can be widely popularized in the fields of liquid viscosity measurement and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram of a detection chip according to the present invention.
FIG. 2 is a schematic view of a partial structure of a photoresist sensor unit according to the present invention.
FIG. 3 is a diagram of the parallel connection of the photo-resistance sensor unit and the signal acquisition unit according to the present invention.
FIG. 4 is a schematic diagram of a voltage signal waveform of the photoresist-type liquid viscosity measuring device according to an embodiment of the present invention.
In the figure: 1. a chip substrate; 2. a drive device; 3. a liquid inlet; 4. a liquid outlet; 5. a liquid storage tank; 6. a micro flow channel; 7. a standard spherical particle addition port; 8. standard spherical particles; 9. a first photoresist sensing unit; 9-1, a first light emitter; 9-2, a first optical receiver; 10. a second photoresist sensing unit; 10-1, a second light emitter; 10-2, a second optical receiver; 11. a third photoresist sensing unit; 11-1, a third light emitter; 11-2, and a third optical receiver.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The invention provides a photoresistance type liquid viscosity measuring device, which comprises: the chip comprises a chip substrate, a detection chip embedded in the chip substrate, an excitation unit connected with the detection chip through a lead, a signal acquisition unit electrically connected with the excitation unit and a calculation unit; the excitation unit outputs stable direct current to excite the detection chip; when standard spherical particles in the liquid to be detected pass through the detection chip, voltage signals are generated, the generated voltage signals are collected by the signal acquisition unit and are transmitted to the calculation unit, and the calculation unit calculates viscosity data of the liquid to be detected.
In specific implementation, as a preferred embodiment of the present invention, as shown in fig. 1, the chip substrate 1 is formed by casting a casting solution, the casting solution-PDMS (polydimethylsiloxane) material and a curing agent are mixed in a ratio of 10:1, and a liquid inlet 3, a micro flow channel 6, a standard spherical particle adding port 7, a liquid storage tank 5 and a liquid outlet 4 are sequentially embedded in the chip substrate 1 by a molding method; the liquid inlet 3, the standard spherical particle adding port 7, the liquid storage tank 5 and the liquid outlet 4 are all communicated with the micro-channel 6; the liquid with the viscosity to be detected flows into the micro-channel 6 from the liquid inlet 3, flows out from the liquid outlet 4 after detection is finished, and flows to the liquid storage tank 5.
In specific implementation, as a preferred embodiment of the present invention, with reference to fig. 1, the detection chip includes a plurality of photoresist sensing units; the structure of each light resistance sensing unit is the same, the arrangement positions are different, and each light resistance sensing unit comprises a light emitter and a light receiver which are vertically arranged on two sides of the micro-channel in an opposite mode. In this embodiment, as shown in fig. 2, the detection chip includes three photoresist sensing units, i.e., a first photoresist sensing unit 9, a second photoresist sensing unit 10, and a third photoresist sensing unit 11; the first light resistance sensing unit 9 comprises a first light emitter 9-1 and a first light receiver 9-2 which are vertically opposite to each other at two sides of the micro-channel 6, and the interval between the first light emitter 9-1 and the first light receiver 9-2 is 300 micrometers-5 millimeters; the second light resistance sensing unit 10 comprises a second light emitter 10-1 and a second light receiver 10-2 which are vertically opposite to each other at two sides of the micro-channel 6, and the interval between the second light emitter 10-1 and the second light receiver 10-2 is 300 micrometers-5 millimeters; the third light resistance sensing unit 11 comprises a third light emitter 11-1 and a third light receiver 11-2 which are vertically opposite to each other at two sides of the micro-channel 6, and the interval between the third light emitter 11-1 and the third light receiver 11-2 is 300 micrometers-5 millimeters.
In specific implementation, as a preferred embodiment of the present invention, as shown in fig. 3, a first photoresist sensing unit 9, a second photoresist sensing unit 10, and a third photoresist sensing unit 11 are connected in parallel to the lead terminals of the signal acquisition unit, and the optical transmitter emits infrared laser to the micro channel perpendicular to the optical receiver; the optical receiver converts the received optical signal into an electrical signal and transmits the electrical signal to the signal acquisition unit. The signal acquisition unit is used for acquiring voltage signals when the standard spherical particles pass through each light resistance sensing unit and displaying all the voltage signals in the same voltage signal diagram.
In practical applications, as a preferred embodiment of the present invention, the apparatus for measuring viscosity of a liquid in a photoresist further comprises a driving device 2, wherein the driving device 2 is disposed at the liquid inlet 3 and is used for providing a constant driving force for the liquid to be measured to flow in the micro flow channel 6.
The working principle of the photoresistance type liquid viscosity measuring device is as follows:
the excitation unit transmits 2V stable direct current to the detection chip for excitation, and the grain diameter of the used standard spherical particles 8 is 100 micrometers-4 millimeters in a light resistance mode; the inner diameter of the micro-channel 6 is 300 micrometers-5 millimeters;
when the standard spherical particles 8 pass through the first photoresist sensing unit 9, the second photoresist sensing unit 10 and the third photoresist sensing unit 11 of the detection chip respectively, because the standard spherical particles 8 shield a part of infrared laser emitted by the first light emitter 9-1, the second light emitter 10-1 and the third light emitter 11-1, the light intensity received by the corresponding first light receiver 9-2, the second light receiver 10-2 and the third light receiver 11-2 is weakened, so that the resistances of the first photoresist sensing unit 9, the second photoresist sensing unit 10 and the third photoresist sensing unit 11 are increased, the voltage is reduced, and a negative voltage pulse signal is generated;
liquid to be detected is injected from a liquid inlet 3 through a driving device 2 at constant pressure and enters a micro-channel 6 of the device. The standard spherical particles 8 enter the micro flow channel 6 containing the liquid to be detected from the standard spherical particle adding port 7 and sequentially pass through the first photoresist sensing unit 9, the second photoresist sensing unit 10 and the third photoresist sensing unit 11. The flow velocity of the standard spherical particles 8 at the first resist sensor unit 9 is set to v1(ii) a The flow velocity v of the standard spherical particles 8 at the second photoresist sensor unit 10 is2(ii) a The distance between the first photo-resist sensor unit 9 and the second photo-resist sensor unit 10 is L1The time difference between the two detected signals is t1(ii) a The distance between the second photo-resist sensor unit 10 and the third photo-resist sensor unit 11 is L2The time difference between the two detected signals is t2. Known as L1、L2、t1、t2According to the formula:
v2＝v1+at1
the acceleration a of the standard spherical particles 8 in the micro flow channel 6 and the velocity v at each photo-resist sensing unit can be known, and this operation can eliminate the horizontal velocity error of the standard spherical particles 8 after entering the micro flow channel 6. The standard spherical particles 8 are subjected to a driving force F of the driving device 2 and a viscous resistance F in the liquid to be measured in the micro flow channel 6η：
Fη＝A·τ＝4πr2·τ
In the formula, FηIs the viscous drag experienced by the standard spherical particle 8, m is its mass, ρ is its density, r is its radius, A is its outer surface area, τ is its viscous shear stress experienced,
and eta is the viscosity of the liquid to be measured, which is the velocity gradient in the motion of the liquid.
Each light resistance sensing unit is connected with the signal acquisition unit in series/parallel, so that the voltage pulses of the same standard spherical particle 8 detected by different light resistance sensing units are reflected in the same inductance signal diagram, as shown in fig. 4; the signal acquisition unit acquires voltage signals detected by the light resistance sensing units, transmits the voltage signals to the calculation unit, and obtains the viscosity eta of the liquid to be detected through data processing.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A photoresist-type liquid viscosity measuring device, comprising: the chip comprises a chip substrate, a detection chip embedded in the chip substrate, an excitation unit connected with the detection chip through a lead, a signal acquisition unit electrically connected with the excitation unit and a calculation unit; the excitation unit outputs stable direct current to excite the detection chip; when standard spherical particles in the liquid to be detected pass through the detection chip, voltage signals are generated, the generated voltage signals are collected by the signal acquisition unit and are transmitted to the calculation unit, and the calculation unit calculates viscosity data of the liquid to be detected.
2. The photoresist liquid viscosity measuring device according to claim 1, wherein the chip substrate is formed by casting a casting liquid, and a liquid inlet, a micro flow channel, a standard spherical particle adding port, a liquid storage tank and a liquid outlet are sequentially embedded in the chip substrate by a molding method; the liquid inlet, the standard spherical particle adding port, the liquid storage tank and the liquid outlet are communicated with the micro-channel; and the liquid to be detected flows into the micro-channel from the liquid inlet, flows out from the liquid outlet after detection and flows to the liquid storage tank.
3. The photoresist-type liquid viscosity measuring device according to claim 1, wherein the detection chip includes a plurality of photoresist sensing units; the structure of each light resistance sensing unit is the same, the arrangement positions are different, and each light resistance sensing unit comprises a light emitter and a light receiver which are vertically arranged on two sides of the micro-channel in an opposite mode.
4. The apparatus of claim 3, wherein the photoresist sensor units are connected in parallel to the lead terminals of the signal acquisition unit, and the signal acquisition unit is configured to acquire the voltage signals of the standard spherical particles passing through each photoresist sensor unit and display all the voltage signals in the same voltage signal diagram.
5. The photoresist-type liquid viscosity measuring device according to claim 3, wherein the light emitter emits infrared laser light to the micro flow channel perpendicular to the light receiver; the optical receiver converts the received optical signal into an electrical signal and transmits the electrical signal to the signal acquisition unit.
6. The apparatus of claim 1, further comprising a driving device disposed at the liquid inlet for providing a constant driving force for the liquid to be measured to flow in the micro flow channel.
7. The photoresist-type liquid viscosity measuring device according to claim 2, wherein the standard spherical particle adding port is used for injecting standard spherical particles into the liquid to be tested in the micro flow channel; standard spherical particles employ a non-transparent medium for blocking a portion of the laser light emitted by the light emitter.
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| CN2529243Y (en) * | 2002-02-19 | 2003-01-01 | 上海上大电子设备有限公司 | Falling ball method viscosity coefficient investigating instrument |
| JP2005091186A (en) * | 2003-09-18 | 2005-04-07 | Toyota Central Res & Dev Lab Inc | Method of measuring viscosity of liquid, and measuring instrument for index for indicating viscosity |
| JP2010060544A (en) * | 2008-09-02 | 2010-03-18 | Keisuke Fukui | Method and device for measuring viscosity and particle size distribution using brown particle |
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| US20180321124A1 (en) * | 2017-05-04 | 2018-11-08 | University Of Connecticut | Assembly for Measuring the Viscosity of Fluids Using Microchannels |
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