CN112014277A - Portable magnetic particle detection equipment - Google Patents
Portable magnetic particle detection equipment Download PDFInfo
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- CN112014277A CN112014277A CN201910453349.3A CN201910453349A CN112014277A CN 112014277 A CN112014277 A CN 112014277A CN 201910453349 A CN201910453349 A CN 201910453349A CN 112014277 A CN112014277 A CN 112014277A
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- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 239000006249 magnetic particle Substances 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000012360 testing method Methods 0.000 claims description 53
- 230000005294 ferromagnetic effect Effects 0.000 claims description 49
- 239000002245 particle Substances 0.000 claims description 49
- 239000010453 quartz Substances 0.000 claims description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 37
- 238000007747 plating Methods 0.000 claims description 28
- 238000000576 coating method Methods 0.000 claims description 17
- 230000005291 magnetic effect Effects 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000004806 packaging method and process Methods 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 238000010897 surface acoustic wave method Methods 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention provides a portable magnetic particle detection device, comprising: the device comprises a detection device, a processor and a display; the detection device and the display are both connected with the processor; the detection device comprises: sensor subassembly, top cap and magnet. The invention can accurately measure the concentration of magnetic particles in the detected liquid, has high sensitivity, good stability, simple structure, convenient operation and time saving.
Description
Technical Field
The invention relates to the field of sensors, in particular to portable magnetic particle detection equipment.
Background
Machines and equipment such as aeroengines, helicopter gear boxes, steam turbines, high-speed railways and the like all need a high-sensitivity portable magnetic particle detector to measure on site. For example, when an aircraft is performing a flight mission, it is desirable to know the condition of the lubricant, and in particular the amount/concentration of magnetic metal particles in the oil, before preparing for the next flight. Typically, for advanced jet engines, when the concentration of magnetic metal particles reaches a very low PPM, or the concentration jumps to an even lower PPM, the lubricant needs to be changed. Many laboratory devices can measure such low concentration lower limits, such as atomic absorption spectrometers. However, portable devices may be more convenient for measuring the condition of the lubricant and wear of field devices. The current technology and products are also portable, such as the product of Parker, which uses an inductance coil sensor to correlate the change of magnetic particle concentration and magnetic flux, however, the method has small correlation to the detection of the magnetic particle concentration, and they create an indirect parameter of "PQ", which is far away from the PPM unit required by the national standard.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides portable magnetic particle detection equipment which can accurately measure the concentration of magnetic particles in detected liquid, and has the advantages of high sensitivity, good stability, simple structure, convenience in operation and time saving.
The invention provides a portable magnetic particle detection device, comprising: the device comprises a detection device, a processor and a display;
the detection device and the display are both connected with the processor;
the detection device comprises: the sensor comprises a sensor component, a top cover and a magnet, wherein the top cover is positioned at the top of the sensor component, is connected with the sensor component and forms a cavity, the cavity is a testing cavity, and the magnet is arranged on the top cover and is positioned in the testing cavity;
when the test cavity is filled with the liquid to be detected, and the top cover is far away from the test cavity, the ferromagnetic particles in the liquid to be detected are in a first state, the ferromagnetic particles are all gathered at the center of the test cavity, and when the top cover covers the test cavity, the ferromagnetic particles in the liquid to be detected are in a second state; the second state is that the ferromagnetic particles are all far away from the center of the test cavity;
the processor is used for respectively obtaining the measurement values of the sensor assembly when the ferromagnetic particles are in the first state and the second state, and calculating the concentration of the ferromagnetic particles in the detected liquid according to the measurement values;
the display is used for receiving and displaying the ferromagnetic particle concentration sent by the processor.
Optionally, the sensor assembly includes: a weighing sensor, a magnetic device and a packaging device;
the magnetic device is placed right below the weighing sensor;
the packaging device is used for packaging the weighing sensor and the magnetic device.
Optionally, the weighing sensor is one or more of a quartz sensor, a surface acoustic wave sensor, a flexible plate mode sensor and an interdigital sensor.
Optionally, the weighing sensor is a quartz microbalance;
the quartz microbalance comprises: quartz oscillating circuit, quartz sensor wafer and metal coating;
two electrodes of the quartz oscillation circuit are respectively arranged on the upper surface and the lower surface of the quartz sensor wafer, the quartz sensor wafer is arranged on the top of the quartz sensor, and the upper surface and the lower surface of the quartz sensor wafer are respectively plated with the metal coating.
Optionally, the metal plating layer comprises two plating layers, namely a bottom plating layer and an upper plating layer; the surface of the bottom coating is plated with the upper coating;
the bottom layer plating layer adopts a chromium plating layer, and the upper layer plating layer adopts a gold plating layer; or,
the bottom plating layer is a nickel plating layer, and the upper plating layer is a silver plating layer.
Optionally, the magnet and the magnetic device are permanent magnets or electromagnets.
Optionally, a circle of surplus oil sample overflow outlet is formed in the test cavity.
Optionally, the sensor assembly is sleeved in the oil reservoir, a gap is reserved between the sensor assembly and the oil reservoir, and the gap forms an oil reservoir cavity.
Optionally, a temperature sensor is mounted on the sensor assembly, and the temperature sensor is located in the test cavity;
the temperature sensor is connected with the processor;
and the processor is used for carrying out temperature compensation on the calculated ferromagnetic particle concentration according to the temperature value of the temperature sensor.
The invention provides a portable magnetic particle detection device, comprising: the device comprises a detection device, a processor and a display; the detection device and the display are both connected with the processor; the detection device comprises: the sensor comprises a sensor component, a top cover and a magnet, wherein the top cover is positioned at the top of the sensor component, is connected with the sensor component and forms a cavity, the cavity is a testing cavity, and the magnet is arranged on the top cover and is positioned in the testing cavity; when the test cavity is filled with the liquid to be detected, and the top cover is far away from the test cavity, the ferromagnetic particles in the liquid to be detected are in a first state, the ferromagnetic particles are all gathered at the center of the test cavity, and when the top cover covers the test cavity, the ferromagnetic particles in the liquid to be detected are in a second state; the second state is that the ferromagnetic particles are all far away from the center of the test cavity; the processor is used for respectively obtaining the measurement values of the sensor assembly when the ferromagnetic particles are in the first state and the second state, and calculating the concentration of the ferromagnetic particles in the detected liquid according to the measurement values; the display is used for receiving and displaying the ferromagnetic particle concentration sent by the processor.
The invention can accurately measure the concentration of magnetic particles in the detected liquid, has high sensitivity, good stability, simple structure, convenient operation and time saving.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic diagram of a detection apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of another detecting device provided in the embodiment of the present invention;
FIG. 3 is a schematic diagram of a ferromagnetic particle in a liquid to be detected according to an embodiment of the present invention;
fig. 4 is a schematic diagram of another example of ferromagnetic particles in a liquid to be detected according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
The invention provides a portable magnetic particle detection device. Embodiments of the present invention will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of a portable magnetic particle detection apparatus according to an embodiment of the present invention, where the portable magnetic particle detection apparatus according to the embodiment includes: the device comprises a detection device, a processor and a display; the detection device and the display are both connected with the processor; the detection device comprises: the sensor comprises a sensor component 1, a top cover 2 and a magnet 3, wherein the top cover 2 is positioned at the top of the sensor component 1, is connected with the sensor component 1 and forms a cavity, the cavity is a testing cavity 4, and the magnet 3 is arranged on the top cover 2 and is positioned in the testing cavity 4; when the testing cavity 4 is filled with the liquid to be tested, and the top cover 2 is far away from the testing cavity 4, the ferromagnetic particles 12 in the liquid to be tested are in a first state, the ferromagnetic particles 12 are all gathered at the center of the testing cavity 4, and when the top cover 2 covers the testing cavity 4, the ferromagnetic particles 12 in the liquid to be tested are in a second state; the second state is that the ferromagnetic particles 12 are all away from the center of the test chamber 4; the processor is used for respectively obtaining the measured values of the sensor assembly 1 when the ferromagnetic particles 12 are in the first state and the second state, and calculating the concentration of the ferromagnetic particles 12 in the detected liquid according to the measured values; the display is used for receiving and displaying the concentration of the ferromagnetic particles 12 sent by the processor.
When the test cavity 4 is filled with the liquid to be detected, and the top cover 2 is far away from the test cavity 4, standing for a period of time, and after the liquid to be detected in the test cavity 4 is stable, the processor obtains a first measured value of the current sensor assembly 1 again, and at the moment, ferromagnetic particles 12 in the liquid to be detected are gathered at the center of the test cavity 4; when the top cover 2 covers the testing cavity 4, the ferromagnetic particles 12 in the detected liquid are far away from the center of the testing cavity 4, the processor stays for a period of time, and after the detected liquid in the testing cavity 4 is stable, the processor obtains a second measured value of the current sensor assembly 1; the processor can calculate the concentration of the ferromagnetic particles 12 in the detected liquid according to the first measurement value and the second measurement value. Wherein when the ferromagnetic particles 12 are in the first state or the second state, the ferromagnetic particles 12 are adsorbed on the surface of the sensor component 1.
FIG. 1 is a schematic view of the detecting device in a first state; fig. 2 is a schematic diagram of the detecting device in the second state.
In the present invention, the method may further include: when the top cover 2 is covered for a period of time, the top cover 2 is opened again, after standing for a period of time, the ferromagnetic particles 12 are gathered at the center of the test cavity 4 again, the third measured value of the current sensor assembly 1 is measured again, and finally, the processor calculates the concentration of the ferromagnetic particles 12 in the detected liquid together according to the first measured value, the second measured value and the third measured value. When the liquid to be detected is doped with other substances, the concentration of the ferromagnetic particles 12 in the liquid to be detected can be accurately measured by the method.
In the present invention, the images of the detected liquid in the test chamber 4 in the first state and the second state can be analyzed to obtain the concentration of the ferromagnetic particles 12. As shown in fig. 3, a schematic diagram of the ferromagnetic particles 12 in a first state; fig. 4 is a schematic diagram of the ferromagnetic particles 12 in the second state.
In the present invention, the sensor assembly 1 includes: a weighing sensor 5, a magnetic device 6 and a packaging device 7; the magnetic device 6 is placed directly below the load cell 5; the packaging device 7 is used for packaging the weighing sensor 5 and the magnetic device 6.
Wherein the magnetic means 6 are arranged to increase the magnetic field strength such that the ferromagnetic particles 12 are attracted to the surface of the sensor assembly 1.
Wherein, the weighing sensor 5 adopts one or more of a quartz sensor, a surface acoustic wave sensor, a flexible plate mode sensor, an interdigital sensor and the like.
Wherein the magnet 3 and the magnetic device 6 are permanent magnets 3 or electromagnets 3. Preferably a permanent magnet 3.
In the invention, the weighing sensor 5 adopts a quartz microbalance; the quartz microbalance comprises: quartz oscillating circuit, quartz sensor wafer and metal coating; two electrodes of the quartz oscillation circuit are respectively arranged on the upper surface and the lower surface of the quartz sensor wafer, the quartz sensor wafer is arranged on the top of the quartz sensor, and the upper surface and the lower surface of the quartz sensor wafer are respectively plated with the metal coating.
The metal coating comprises two layers of coatings, namely a bottom coating and an upper coating; the surface of the bottom coating is plated with the upper coating; the bottom layer plating layer adopts a chromium plating layer, and the upper layer plating layer adopts a gold plating layer; or the bottom plating layer is a nickel plating layer, and the upper plating layer is a silver plating layer.
When the weighing sensor 5 is in a quartz microbalance, the oscillation frequency of the quartz sensor is low when the ferromagnetic particles 12 are in the first state, and when the ferromagnetic particles 12 are in the second state, the oscillation frequency of the quartz microbalance is high, and the oscillation frequency of the quartz microbalance is related to the mass of the surface, therefore, the mass of the ferromagnetic particles 12 can be calculated according to the measured values of the quartz microbalance in the first state and the second state, and then the concentration of the ferromagnetic particles 12 can be calculated according to the volume of the liquid to be detected injected into the testing chamber 4, and the calculation method can be adopted as follows:
the sensitivity of QCM sensors is based on frequency change as known from the Sauerbrey formula, which indicates the relationship between mass change per unit area of QCM electrode surface and observed crystal oscillation frequency change:
Δf＝-C_f·Δm
wherein, Δ f: the measured frequency change of the quartz microbalance, in Hz,
Δ m: the change in mass per unit area, in g/cm2,
c _ f: sensitivity factor of crystal oscillator (for example, 56.6g-1cm2 for AT-cut 5MHz quartz crystal oscillator AT room temperature)
From the above formula, it follows that the sensitivity of the QCM sensor depends on C _ f, which is a fixed value for a fixed size QCM. For some Acoustic Wave devices, for example, surface Acoustic Wave sensors SAW (surface Acoustic Wave sensors), twisted Plate Mode Acoustic Wave device (FPM) Flexual Plate Mode, Tuning fork Acoustic Wave device Tuning, Plate Amplitude Mode Acoustic Wave device (APM) Amplitude Plate Mode Sensor, Bulk Wave device (BAW) Bulk Acoustic Wave, Thickness tangential Mode Acoustic Wave device Thickness tangential Wave Mode (TSM).
When the electrodes of the sensor are only arranged on one side, the sensitive electrodes of the sensor do not need to contact with the monitored substances, so that the pollution of the electrodes is reduced, and the service lives of the electrodes and the sensor are prolonged; and the device substrate can be corroded from the back, the thickness of the substrate is reduced, the sensitivity of the sensor is improved, and the principle of the invention can also be applied.
In the invention, a circle of surplus oil sample overflow outlets 8 are formed in the test cavity 4. The apparatus may further include: the sensor assembly 1 is sleeved in the oil storage device 9, a gap is reserved between the sensor assembly 1 and the oil storage device 9, and the gap forms an oil storage cavity 10.
Sensitivity is limited because the test chamber 4 can only contain a small amount of oil. When an excess oil sample overflow port 8 is left in the test chamber 4, excess oil overflows into the oil reservoir 10 of the sensor or the iron gauge.
In the invention, a temperature sensor 11 is mounted on the sensor assembly 1, and the temperature sensor 11 is arranged in the test cavity 4; the temperature sensor 11 is connected with the processor; the processor is used for performing temperature compensation on the calculated concentration of the ferromagnetic particles 12 according to the temperature value of the temperature sensor 11.
To reduce the test time, it is sometimes necessary to first place a standard new oil sample of the oil being tested into the test chamber 4. Thus, when a test oil sample is poured into the test chamber 4, the test oil and the new oil sample will mix and the magnetic particles in the test oil sample will be adsorbed on the upper surface of the load cell 5. Many times, because the temperature of the test oil sample is very high, the new oil sample put in first plays the effect of a temperature moderating zone. Prevent damage of the load cell 5 and reduce measurement time, reducing errors. The temperature sensor 11 may be further temperature compensated.
The portable magnetic particle detection device provided by the invention is provided above.
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; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. A portable magnetic particle detection apparatus, comprising: the device comprises a detection device, a processor and a display;
the detection device and the display are both connected with the processor;
the detection device comprises: the sensor comprises a sensor component, a top cover and a magnet, wherein the top cover is positioned at the top of the sensor component, is connected with the sensor component and forms a cavity, the cavity is a testing cavity, and the magnet is arranged on the top cover and is positioned in the testing cavity;
when the test cavity is filled with the liquid to be detected, and the top cover is far away from the test cavity, the ferromagnetic particles in the liquid to be detected are in a first state, the ferromagnetic particles are all gathered at the center of the test cavity, and when the top cover covers the test cavity, the ferromagnetic particles in the liquid to be detected are in a second state; the second state is that the ferromagnetic particles are all far away from the center of the test cavity;
the processor is used for respectively obtaining the measurement values of the sensor assembly when the ferromagnetic particles are in the first state and the second state, and calculating the concentration of the ferromagnetic particles in the detected liquid according to the measurement values;
the display is used for receiving and displaying the ferromagnetic particle concentration sent by the processor.
2. The apparatus of claim 1, wherein the sensor assembly comprises: a weighing sensor, a magnetic device and a packaging device;
the magnetic device is placed right below the weighing sensor;
the packaging device is used for packaging the weighing sensor and the magnetic device.
3. The apparatus of claim 2, wherein the load cell employs one or more of a quartz sensor, a surface acoustic wave sensor, a flexplate mode sensor, and an interdigital sensor.
4. The apparatus of claim 3, wherein the load cell employs a quartz microbalance;
the quartz microbalance comprises: quartz oscillating circuit, quartz sensor wafer and metal coating;
two electrodes of the quartz oscillation circuit are respectively arranged on the upper surface and the lower surface of the quartz sensor wafer, the quartz sensor wafer is arranged on the top of the quartz sensor, and the upper surface and the lower surface of the quartz sensor wafer are respectively plated with the metal coating.
5. The apparatus of claim 4, wherein the metal coating comprises two layers, a bottom layer and a top layer; the surface of the bottom coating is plated with the upper coating;
the bottom layer plating layer adopts a chromium plating layer, and the upper layer plating layer adopts a gold plating layer; or,
the bottom plating layer is a nickel plating layer, and the upper plating layer is a silver plating layer.
6. The apparatus of claim 2, wherein: the magnet and the magnetic device are permanent magnets or electromagnets.
7. The apparatus according to any one of claims 1 to 6, wherein: and a circle of redundant oil sample overflow outlets are formed in the test cavity.
8. The apparatus of claim 7, further comprising: the sensor assembly is sleeved in the oil storage device, a gap is reserved between the sensor assembly and the oil storage device, and the gap forms an oil storage cavity.
9. The apparatus according to any one of claims 1 to 8, wherein: the sensor assembly is provided with a temperature sensor which is arranged in the test cavity;
the temperature sensor is connected with the processor;
and the processor is used for carrying out temperature compensation on the calculated ferromagnetic particle concentration according to the temperature value of the temperature sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910453349.3A CN112014277A (en) | 2019-05-28 | 2019-05-28 | Portable magnetic particle detection equipment |
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| CN201910453349.3A CN112014277A (en) | 2019-05-28 | 2019-05-28 | Portable magnetic particle detection equipment |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2090860C1 (en) * | 1994-02-24 | 1997-09-20 | Дмитрий Александрович Дмитриев | Device measuring concentration of ferromagnetic particles in liquid |
| CN1815176A (en) * | 2006-02-10 | 2006-08-09 | 张超 | Piezoelectric sensor for on-line monitoring liquid viscosity and grain amount and measuring method |
| US20060286563A1 (en) * | 2005-06-21 | 2006-12-21 | Industrial Technology Research | Analytical method and device utilizing magnetic materials |
| CN1885027A (en) * | 2005-06-24 | 2006-12-27 | 财团法人工业技术研究院 | Analyzing method and apparatus employing magnetic material |
| CN201034911Y (en) * | 2007-04-05 | 2008-03-12 | 张峰 | Portable oil-liquid iron magnelic properties abrasive grain amount and viscosity coefficient testing apparatus |
| CN104165819A (en) * | 2013-08-29 | 2014-11-26 | 北京至感科技有限公司 | Online real-time magnetic particle monitoring system |
| CN104198320A (en) * | 2013-08-29 | 2014-12-10 | 北京至感科技有限公司 | Handheld fast reaction iron content monitor |
| CN108801868A (en) * | 2017-05-03 | 2018-11-13 | 北京至感传感器技术研究院有限公司 | Particulate matter on-line monitoring system in liquid oil |
-
2019
- 2019-05-28 CN CN201910453349.3A patent/CN112014277A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2090860C1 (en) * | 1994-02-24 | 1997-09-20 | Дмитрий Александрович Дмитриев | Device measuring concentration of ferromagnetic particles in liquid |
| US20060286563A1 (en) * | 2005-06-21 | 2006-12-21 | Industrial Technology Research | Analytical method and device utilizing magnetic materials |
| CN1885027A (en) * | 2005-06-24 | 2006-12-27 | 财团法人工业技术研究院 | Analyzing method and apparatus employing magnetic material |
| CN1815176A (en) * | 2006-02-10 | 2006-08-09 | 张超 | Piezoelectric sensor for on-line monitoring liquid viscosity and grain amount and measuring method |
| CN201034911Y (en) * | 2007-04-05 | 2008-03-12 | 张峰 | Portable oil-liquid iron magnelic properties abrasive grain amount and viscosity coefficient testing apparatus |
| CN104165819A (en) * | 2013-08-29 | 2014-11-26 | 北京至感科技有限公司 | Online real-time magnetic particle monitoring system |
| CN104198320A (en) * | 2013-08-29 | 2014-12-10 | 北京至感科技有限公司 | Handheld fast reaction iron content monitor |
| CN108801868A (en) * | 2017-05-03 | 2018-11-13 | 北京至感传感器技术研究院有限公司 | Particulate matter on-line monitoring system in liquid oil |
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