CN102862391A - Ink test device and test method thereof - Google Patents
Ink test device and test method thereof Download PDFInfo
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- CN102862391A CN102862391A CN2011101865537A CN201110186553A CN102862391A CN 102862391 A CN102862391 A CN 102862391A CN 2011101865537 A CN2011101865537 A CN 2011101865537A CN 201110186553 A CN201110186553 A CN 201110186553A CN 102862391 A CN102862391 A CN 102862391A
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Abstract
The invention provides an ink test device and a test method of the ink test device. The ink test device comprises a vibration chamber, a receiving chamber, a sound production device, an acoustical-electrical transducer, a controller, wherein the vibration chamber and the receiving chamber are arranged at the two sides of the upper part of an ink box and are communicated with the ink chamber of the ink box; section areas of the vibration chamber and the receiving chamber are the same; the sound production device is connected on the vibration chamber by a manner of sealing; the acoustical-electrical transducer is connected on the receiving chamber by a manner of sealing; the controller is electronically connected with the sound production device and the acoustical-electrical transducer; the controller is used for transmitting a control signal to the sound production device, is used for receiving a receiving signal of the acoustical-electrical transducer, and analyzing the signals to obtain ink information. With the adoption of the ink test device and the test method of the ink test device, the sound transmission characteristics of sound waves in variable section tubes are utilized, and the ink chamber is used as the insertion tubes of sound transmission tubes, so that the sound waves pass through the sound transmission tubes; the transmission coefficient of the sound waves is related to the section area of the ink chamber, later the section area of the ink chamber can be obtained according to the sound intensity value of the sound saves after passing through the ink chamber, and then the ink information can be obtained.
Description
Technical field
The present invention relates to printer, especially checkout gear and the detection method thereof of ink-cases of printers China ink amount.
Background technology
Ink can constantly be consumed during ink-jet printer work, until with the ink approach exhaustion in the print cartridge.If the consumer obtains less than the most information of China ink, continue to print, not only cause the waste of paper, ink-jet printer is damaged, affect print quality.For the user can in time obtain the information warning that ink is used up, need to be designed for and be intended to prevent that China ink is measured the checkout gear that ink-jet printer is still worked when exhausting in the print cartridge.
At present, the detection device of ink amount of ink-jet printer mainly contains three kinds: 1, photoinduction formula checkout gear, after ink-jet printer sends light beam, by the mirror reflects on the print cartridge, when ink was arranged, speculum was soaked by ink, ink-jet printer can't receive reverberation, during without ink, then there is reverberation to be received by ink-jet printer, takes this to judge having or not of the interior ink of print cartridge.Its deficiency is to judge concrete China ink amount; 2, resistor detecting device is provided with two contacts in the print cartridge, when being covered with ink between two contacts, ink is as resistance, and ink-jet printer can be judged the ink surplus by detecting two resistance values between the contact; 3, piezoelectric element checkout gear by the extruding force of the print cartridge China and Mexico water yield to piezoelectric element, records the residue China ink amount in black chamber.These several checkout gears all need to have conductor or speculum etc. to stretch in the black chamber, and conductor contacts with ink, easily affects the ink quality, and it occupies spatial volume and has reduced the ink reservoir volume of print cartridge.
Summary of the invention
Main purpose of the present invention provides a kind of simple in structure, detection device of ink amount that cost is low.
Another object of the present invention provides a kind of ink quantity measuring method of using above-mentioned detection device of ink amount.
An also purpose of the present invention provides a kind of ink-jet printer of using above-mentioned detection device of ink amount.
For realizing above-mentioned purpose, detection device of ink amount provided by the invention comprises vibration cavity and the reception cavity that is arranged on both sides, print cartridge top and is communicated with the black chamber of print cartridge, and vibration cavity has identical area of section with reception cavity; One microphone device, microphone device are sealedly connected on the vibration cavity; One acoustical-electrical transducer spare, acoustical-electrical transducer spare are sealedly connected on the reception cavity; Controller, controller are electrically connected microphone device harmony power conversion device, and controller sends control signal to described microphone device, and receive the reception signal of acoustical-electrical transducer spare, and analyze to get amount information out of ink.
According to Principles of Acoustics knowledge, reflection and the transmission of sound wave can occur during through a varying cross-section duct in sound, transmission coefficient and area of section than and the length of intubate relevant.The vibration cavity of this programme, black chamber and reception cavity form a voice tube, and black chamber wherein is equivalent to an intubate.The sectional area of supposing vibration cavity and reception cavity is
, the sectional area in black chamber is
(
), the length that black chamber is connected between vibration cavity and the reception cavity is
, then a frequency is
Sound wave when the voice tube, this acoustic wave transmission coefficient is
, wherein,
,
,
,
,
The speed of in air, propagating for sound wave,
The wavelength of in air, propagating for sound wave.When the sound wave of a fixed frequency passed through black chamber, with the consumption of inking chamber China and Mexico amount, black chamber internal cavity sectional area increased, and this acoustic wave transmission coefficient changes, and the sound wave sound intensity that reception cavity receives becomes certain functional relation with black chamber internal cavity sectional area.The sound intensity value of the sound wave that receives according to reception cavity can obtain black chamber internal cavity sectional area, thereby calculates residue China ink amount in the chamber out of ink.
So the sound wave of the fixed frequency that the microphone device of this programme sends spreads into black chamber through vibration cavity, is then received by acoustical-electrical transducer spare by reception cavity, the corresponding relation according to the sound intensity value that receives and black chamber internal cavity sectional area can get amount out of ink.
Concrete scheme is that microphone device comprises the adjustable frequency generator, adjustable frequency generator input electrical connection controller output end; The first loudspeaker, the signal of telecommunication terminals of the first loudspeaker are connected with the adjustable frequency generator output end, and the horn mouth of the first loudspeaker is sealedly connected on the vibration cavity porch.The first loudspeaker is realized the function of electroacoustic conversion in this scheme, regulates the sound wave that the first loudspeaker sends a fixed frequency by the adjustable frequency generator, and sound wave enters black chamber from vibration cavity.
Scheme is more specifically, and acoustical-electrical transducer spare comprises the second loudspeaker that is sealedly connected on the reception cavity exit; Analog-to-digital conversion module, the signal of telecommunication terminals of the second loudspeaker are connected with the analog-to-digital conversion module input, and the analog-to-digital conversion module output connects the controller input.The second loudspeaker of this scheme is realized the function of acoustic-electric conversion, and sound wave is converted into the signal of telecommunication through behind the voice tube by the second loudspeaker, and the signal of telecommunication is converted into data signal by analog-to-digital conversion module again, and data signal is transported to controller.
Ink quantity measuring method provided by the invention, its detecting step comprise that controller control microphone device sends the sound wave of a fixed frequency continuously; When this sound wave enters black chamber through vibration cavity, when then being accepted the chamber and receiving, acoustical-electrical transducer spare transforms and is sent to controller with acoustic signals; Controller can get chamber out of ink cavity volume according to the sound intensity value of the sound wave that receives and the corresponding relation between sound wave sound intensity value and the black chamber cavity cross-sectional area, thereby calculates residue China ink amount.
Concrete scheme is that microphone device comprises the adjustable frequency generator, adjustable frequency generator input electrical connection controller output end; The first loudspeaker, the signal of telecommunication terminals of the first loudspeaker are connected with the adjustable frequency generator output end, and the horn mouth of the first loudspeaker is sealedly connected on the vibration cavity porch.The first loudspeaker is realized the function of electroacoustic conversion in this scheme, regulates the sound wave that the first loudspeaker sends a fixed frequency by the adjustable frequency generator, and sound wave enters black chamber from vibration cavity.
Scheme is more specifically, and acoustical-electrical transducer spare comprises the second loudspeaker, and the horn mouth of the second loudspeaker is sealedly connected on the reception cavity exit; Analog-to-digital conversion module, the signal of telecommunication terminals of the second loudspeaker are connected with the analog-to-digital conversion module input, and the analog-to-digital conversion module output connects the controller input.The second loudspeaker of this scheme is realized the function of acoustic-electric conversion, and sound wave is converted into the signal of telecommunication through behind the voice tube by the second loudspeaker, and the signal of telecommunication is converted into data signal by analog-to-digital conversion module again, and data signal is transported to controller.
Ink-jet printer provided by the invention comprises main body, and print cartridge is installed in the main body; Detection device of ink amount; Detection device of ink amount comprises vibration cavity and the reception cavity that is arranged on both sides, print cartridge top and is communicated with the black chamber of print cartridge, and vibration cavity has identical area of section with reception cavity; One microphone device, microphone device are sealedly connected on the vibration cavity; One acoustical-electrical transducer spare, acoustical-electrical transducer spare are sealedly connected on the reception cavity; Controller, controller are electrically connected microphone device harmony power conversion device, and controller sends control signal to microphone device, and receive the reception signal of acoustical-electrical transducer spare, and analyze to get amount information out of ink.
During use, the controller control microphone device of detection device of ink amount sends sound wave, sound wave is converted to the signal of telecommunication by acoustical-electrical transducer spare after vibration cavity, black chamber and reception cavity are propagated, last controller receives the sound intensity value of sound wave, corresponding relation according to sound intensity value and black chamber internal cavity sectional area can get amount out of ink.Detection device of ink amount on the ink-jet printer, energy is reminding user in time, the ink Expenditure Levels.
Concrete scheme is that microphone device comprises the adjustable frequency generator, adjustable frequency generator input electrical connection controller output end; The first loudspeaker, the signal of telecommunication terminals of the first loudspeaker are connected with the adjustable frequency generator output end, and the horn mouth of the first loudspeaker is sealedly connected on the vibration cavity porch.The first loudspeaker is realized the function of electroacoustic conversion in this scheme, regulates the sound wave that the first loudspeaker sends a fixed frequency by the adjustable frequency generator, and sound wave enters black chamber from vibration cavity.
Scheme is more specifically, and acoustical-electrical transducer spare comprises the second loudspeaker, and the horn mouth of the second loudspeaker is sealedly connected on the reception cavity exit; Analog-to-digital conversion module, the signal of telecommunication terminals of the second loudspeaker are connected with the analog-to-digital conversion module input, and the analog-to-digital conversion module output connects the controller input.The second loudspeaker of this scheme is realized the function of acoustic-electric conversion, and sound wave is converted into the signal of telecommunication through behind the voice tube by the second loudspeaker, and the signal of telecommunication is converted into data signal by analog-to-digital conversion module again, and data signal is transported to controller.
Description of drawings
Fig. 1 is the structure chart of embodiment of the invention detection device of ink amount;
Fig. 2 is the FB(flow block) of embodiment ink quantity measuring method.
The invention will be further described below in conjunction with accompanying drawing and each embodiment.
The specific embodiment
Detection device of ink amount embodiment
Referring to Fig. 1, Fig. 1 is the structure chart of detection device of ink amount.
Detection device of ink amount, it mainly is arranged on the print cartridge.
A black chamber 31 is arranged in the box body 3 of print cartridge, in the black chamber ink is housed.Be arranged on the top of box body 3 and vibration cavity 2 and the reception cavity 4 that is communicated with 31 two ends, black chamber, wherein, the liquid level of China ink chamber ink inside is lower than the bottom surface of vibration cavity and receptive cavity forever, and moves on the direction of propagating to reception cavity 4 in chamber 2 at Acoustic self vibration, and two chambeies have identical cross-sectional area.
The horn mouth that is provided with the first loudspeaker 1, the first loudspeaker 1 in the outside of box body 3 side is communicated with vibration cavity 2 sealings, and the horn mouth that is provided with the second loudspeaker 5, the second loudspeakers 5 at the outside opposite side of box body seals with reception cavity 4 and is communicated with.
As seen, vibration cavity 2, black chamber 31 and reception cavity 4 form the voice tube of a variable cross-section, and black chamber 31 is equivalent to intubate on the voice tube in the middle of it, and herein, sound wave is by the propagation in black chamber 31, the black chamber 31 interior cavitys except ink 32 takes up space that refer to.The sound wave that the first loudspeaker 1 sends enters vibration cavity 2, through passing to reception cavity 4 in black chamber 31, is received by the second loudspeaker 5 at last.
Detection device of ink amount also comprises controller, the adjustable frequency generator that is connected with controller output end, the adjustable frequency generator is connected with the signal of telecommunication terminals of the first loudspeaker, with the analog-to-digital conversion module that the signal of telecommunication terminals of the second loudspeaker are connected, the analog-to-digital conversion module output connects the input of controller.
As seen, the first loudspeaker is realized the electroacoustic translation function, and the second loudspeaker is realized the acoustic-electric translation function.Select a frequency by controller control adjustable frequency generator, so the first loudspeaker sends the sound wave of this frequency, sound wave is through vibration cavity, black chamber and reception cavity, and the second last loudspeaker receives the sound intensity of this sound wave, and the sound intensity is converted into data signal and is transported to controller.Because sound wave is through behind the voice tube, length on the sectional area ratio of its transmission coefficient and black chamber and vibration cavity and the direction of propagation in black chamber has relation, and the length on the direction of propagation in black chamber is definite value, and the vibration cavity sectional area is definite value, so transmission coefficient changes with the sectional area in inking chamber.Controller gets the volume in chamber out of ink according to sound intensity value and sound intensity value and sectional area ground, black chamber corresponding relation computable analysis, draws at last residue China ink amount.
Ink quantity measuring method embodiment
Referring to Fig. 2, Fig. 2 is the FB(flow block) of embodiment ink quantity measuring method.
Make the length in the black chamber of print cartridge shown in Figure 1 be
, the sectional area of vibration cavity and reception cavity is
, black chamber internal cavity sectional area is
(
), the fixing test frequency that controller sends is
Controller, the black controller of measuring of special detection that can adopt the printer main body controller or arrange in addition.Controller sends order to the adjustable frequency generator, and order adjustable frequency generator sends a fixing test frequency
, the first loudspeaker sends this test frequency
Sound wave.Sound wave enters from vibration cavity, and propagates in vibration cavity, black chamber and the formed voice tube of reception cavity, is received by the second loudspeaker.The second loudspeaker sends to analog-to-digital conversion module after acoustic signals is converted to the signal of telecommunication, so the signal of telecommunication becomes data signal, last data signal is sent to controller.
Frequency is
Sound wave when in voice tube, propagating, reflection and transmission can occur, the area of section of its transmission coefficient and voice tube than and the length of intubate relevant, transmission coefficient
,
,
,
,
The speed of in air, propagating for sound wave.
According to the transmission coefficient formula, as can be known, when
,
With
During for definite value,
Size with
Relevant, and
Desirable
(
Be 1,2,3 ...), namely
The time,
When getting fixed frequency
Sound wave satisfy
The time, the sound intensity of the sound wave that reception cavity receives likens to certain relation with the area of section of voice tube.So the sound intensity signal according to the second loudspeaker receives can draw the area of section ratio, namely knows the sectional area of black chamber internal cavity, thereby can calculate the black amount situation of residue.
Change with black cavity volume, the sound intensity size of same frequency sound wave after by black chamber changes, and according to this variation relation, can derive the relation of sound intensity value between measuring with China ink by physical equation.
Relation between sound intensity value and the China ink amount also can draw by method of testing.Test process: the print cartridge that will fill ink is installed in the ink-jet printer, and printer prints test, and prints to till ink exhausts for full state from ink always; And, when printer begins to print, controller control adjustable frequency generator sends a fixing test frequency continuously
, wherein,
Satisfy
, simultaneously, the second loudspeaker constantly sends to controller with the sound intensity value that receives after changing, the sound intensity value of the whole print procedure of controller ink from full to sky.Because the printing test process, ink consumes equably, and full quantity of ink is known, so, can draw the corresponding relation of the sound intensity value that records between measuring with China ink.
Selecting test frequency
, and after having obtained corresponding relation between sound intensity value and the China ink amount, use the present embodiment detection device of ink amount to detect the method for China ink amount as follows:
Print cartridge is installed in the printer in the print procedure, and controller control adjustable frequency generator sends a fixing test frequency
Thereby the first loudspeaker sends a frequency and is
Sound wave, sound wave passes to black chamber from vibration cavity, generating unit sub reflector and transmission in black chamber, then sound wave enters reception cavity, received the sound wave of a sound intensity value by the second loudspeaker, the second loudspeaker is converted into the signal of telecommunication with this acoustic signals, and the signal of telecommunication becomes data signal through behind the analog-to-digital conversion module, and data signal is transported to controller.Controller identification sound intensity value, and with its with sound intensity value and China ink amount between corresponding relation relatively, draw the corresponding China ink of sound intensity value and measure, namely obtain China ink amount at this moment.Can in controller, arrange, when black value hour, controller sends the low information of China ink amount.
The present embodiment is according to the transaudient principle of sound wave, and the black chamber of print cartridge is designed to a voice tube, utilize acoustic wave transmission coefficient and voice tube area of section than between corresponding relation, record the China ink amount.The present embodiment is simple in structure, can not contact ink, and not loss PRN device uses reliable.
It is emphasized that embodiment of the invention detection device of ink amount can be applicable on the ink-jet printer, and the ink quantity measuring method of above-described embodiment also is applicable to be provided with the ink-jet printer of the present embodiment detection device of ink amount.And in the ink-jet printer that is provided with the present embodiment detection device of ink amount, the controller of detection device of ink amount can also be connected with printer main body, perhaps direct and printer main body is made as one, and, printer output can be set show the China ink amount situation that detects.
Certainly, above-described embodiment only is the better embodiment of the present invention, during practical application more variation can also be arranged, for example, microphone device can also adopt other electronic devices such as buzzer, receiver, earphone, the device of the general electroacoustic conversion power conversion device of all can making a sound uses, so acoustical-electrical transducer spare can also adopt these changes of other electronic devices such as the buzzer that is inverted, receiver, earphone can realize purpose of the present invention equally.
It is emphasized that at last to the invention is not restricted to above-mentioned embodiment, choose other test values such as test frequency, certainly, guarantee transmission coefficient and area of section ratio
,
Relevant, these variations also should be included in the protection domain of claim of the present invention.
Claims (9)
1. detection device of ink amount is characterized in that:
The vibration cavity and the reception cavity that are arranged on both sides, print cartridge top and are communicated with the black chamber of print cartridge, described vibration cavity has identical area of section with described reception cavity;
One microphone device, described microphone device are sealedly connected on the described vibration cavity;
One acoustical-electrical transducer spare, described acoustical-electrical transducer spare are sealedly connected on the described reception cavity;
Controller, described controller are electrically connected described microphone device and described acoustical-electrical transducer spare, and described controller sends control signal to described microphone device, and receive the reception signal of described acoustical-electrical transducer spare, and analyze to get amount information out of ink.
2. detection device of ink amount according to claim 1 is characterized in that:
Described microphone device comprises
The adjustable frequency generator, described adjustable frequency generator input is electrically connected described controller output end;
The first loudspeaker, the signal of telecommunication terminals of described the first loudspeaker are connected with described adjustable frequency generator output end, and the horn mouth of described the first loudspeaker is sealedly connected on described vibration cavity porch.
3. detection device of ink amount according to claim 1 and 2 is characterized in that:
Described acoustical-electrical transducer spare comprises
The second loudspeaker, the horn mouth of described the second loudspeaker are sealedly connected on described reception cavity exit;
Analog-to-digital conversion module, the signal of telecommunication terminals of described the second loudspeaker are connected with described analog-to-digital conversion module input, and described analog-to-digital conversion module output connects described controller input.
4. application rights requires the ink quantity measuring method of 1 described detection device of ink amount, and its detecting step comprises
Described controller is controlled the sound wave that described microphone device sends a fixed frequency continuously;
When this sound wave enters black chamber through vibration cavity, when then being accepted the chamber and receiving, acoustical-electrical transducer spare transforms and is sent to controller with acoustic signals;
Described controller can get chamber out of ink cavity volume according to the sound intensity value of the sound wave that receives and the corresponding relation between sound wave sound intensity value and the black chamber cavity volume, thereby calculates residue China ink amount.
5. ink quantity measuring method according to claim 4 is characterized in that:
Described microphone device comprises
The adjustable frequency generator, described adjustable frequency generator input is electrically connected described controller output end;
The first loudspeaker, the signal of telecommunication terminals of described the first loudspeaker are connected with described adjustable frequency generator output end, and the horn mouth of described the first loudspeaker is sealedly connected on described vibration cavity porch.
6. it is characterized in that according to claim 4 or 5 described ink quantity measuring methods:
Described acoustical-electrical transducer spare comprises
The second loudspeaker, the horn mouth of described the second loudspeaker are sealedly connected on described reception cavity exit;
Analog-to-digital conversion module, the signal of telecommunication terminals of described the second loudspeaker are connected with described analog-to-digital conversion module input, and described analog-to-digital conversion module output connects described controller input.
7. ink-jet printer comprises
Print cartridge is installed in the main body, described main body;
The detection device of ink amount that is connected with described print cartridge;
It is characterized in that:
Described detection device of ink amount comprises
The vibration cavity and the reception cavity that are arranged on both sides, print cartridge top and are communicated with the black chamber of print cartridge, described vibration cavity has identical area of section with described reception cavity;
One microphone device, described microphone device are sealedly connected on the described vibration cavity;
One acoustical-electrical transducer spare, described acoustical-electrical transducer spare are sealedly connected on the described reception cavity;
Controller, described controller are electrically connected described microphone device and described acoustical-electrical transducer spare, and described controller sends control signal to described microphone device, and receive the reception signal of described acoustical-electrical transducer spare, and analyze to get amount information out of ink.
8. described ink-jet printer according to claim 7 is characterized in that:
Described microphone device comprises
The adjustable frequency generator, described adjustable frequency generator input is electrically connected described controller output end;
The first loudspeaker, the signal of telecommunication terminals of described the first loudspeaker are connected with described adjustable frequency generator output end, and the horn mouth of described the first loudspeaker is sealedly connected on described vibration cavity porch.
9. it is characterized in that according to claim 7 or 8 described ink-jet printers:
Described acoustical-electrical transducer spare comprises
The second loudspeaker, the horn mouth of described the second loudspeaker are sealedly connected on described reception cavity exit;
Analog-to-digital conversion module, the signal of telecommunication terminals of described the second loudspeaker are connected with described analog-to-digital conversion module input, and described analog-to-digital conversion module output connects described controller input.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110186553.7A CN102862391B (en) | 2011-07-05 | 2011-07-05 | Detection device of ink amount and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110186553.7A CN102862391B (en) | 2011-07-05 | 2011-07-05 | Detection device of ink amount and detection method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102862391A true CN102862391A (en) | 2013-01-09 |
| CN102862391B CN102862391B (en) | 2015-10-14 |
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| CN201110186553.7A Expired - Fee Related CN102862391B (en) | 2011-07-05 | 2011-07-05 | Detection device of ink amount and detection method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112406318A (en) * | 2020-11-24 | 2021-02-26 | 武汉先同科技有限公司 | Ink quantity detection device and method based on inductance technology and ink-jet printer |
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| EP0459755A1 (en) * | 1990-05-29 | 1991-12-04 | Baldwin Technology Corporation | Ink level control system for offset printing presses |
| US20020129649A1 (en) * | 2001-03-10 | 2002-09-19 | Samsung Electronics Co., Ltd. | Liquid level measuring apparatus and method |
| CN1587924A (en) * | 2004-07-06 | 2005-03-02 | 北京市凯通软件技术服务有限公司 | Sound wave liquid level emasuring device and its method |
| CN2739590Y (en) * | 2004-09-28 | 2005-11-09 | 福州福光百特自动化设备有限公司 | Ultrasonic material position sensor |
| US20070028684A1 (en) * | 2005-08-04 | 2007-02-08 | Joachim Benz | Device for measuring a filling level |
| CN101769778A (en) * | 2008-12-31 | 2010-07-07 | 中国神华能源股份有限公司 | Real-time monitoring method and system of water depth in port channel |
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2011
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0459755A1 (en) * | 1990-05-29 | 1991-12-04 | Baldwin Technology Corporation | Ink level control system for offset printing presses |
| US20020129649A1 (en) * | 2001-03-10 | 2002-09-19 | Samsung Electronics Co., Ltd. | Liquid level measuring apparatus and method |
| CN1587924A (en) * | 2004-07-06 | 2005-03-02 | 北京市凯通软件技术服务有限公司 | Sound wave liquid level emasuring device and its method |
| CN2739590Y (en) * | 2004-09-28 | 2005-11-09 | 福州福光百特自动化设备有限公司 | Ultrasonic material position sensor |
| US20070028684A1 (en) * | 2005-08-04 | 2007-02-08 | Joachim Benz | Device for measuring a filling level |
| CN101769778A (en) * | 2008-12-31 | 2010-07-07 | 中国神华能源股份有限公司 | Real-time monitoring method and system of water depth in port channel |
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| CN112406318A (en) * | 2020-11-24 | 2021-02-26 | 武汉先同科技有限公司 | Ink quantity detection device and method based on inductance technology and ink-jet printer |
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