[go: up one dir, main page]

CN111208094A - A transparent tube liquid monitoring device and method that can prevent misjudgment - Google Patents

A transparent tube liquid monitoring device and method that can prevent misjudgment Download PDF

Info

Publication number
CN111208094A
CN111208094A CN202010121615.5A CN202010121615A CN111208094A CN 111208094 A CN111208094 A CN 111208094A CN 202010121615 A CN202010121615 A CN 202010121615A CN 111208094 A CN111208094 A CN 111208094A
Authority
CN
China
Prior art keywords
signal
transparent
electrical signal
liquid
initial threshold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010121615.5A
Other languages
Chinese (zh)
Inventor
曲鑫
屈八一
冯兴乐
张磊
俞东松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changan University
Original Assignee
Changan University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Changan University filed Critical Changan University
Priority to CN202010121615.5A priority Critical patent/CN111208094A/en
Publication of CN111208094A publication Critical patent/CN111208094A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver

Landscapes

  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Geophysics (AREA)
  • Health & Medical Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

本发明提供的一种可防误判的透明管液体监测装置及方法，包括LED光源、透明输液管、光电传感器、信号调制及放大电路模块、ADC及后端处理器模块，其中，LED光源用于向透明输液管提供光源；光电传感器用于采集透明输液管的光强信号，并将采集到的光强信号转化为电流信号，同时将电流信号传输至信号调制及放大电路模块；信号调制及放大电路模块用于将电流信号转换成电压信号，经过放大电路进行放大，之后将放大信号传输至ADC及后端处理器模块；ADC及后端处理器模块用于将接收到的电压模拟信号转换成数字信号并进行后端处理；对初始阈值进行实时更新，用以提高判断准确性。

Figure 202010121615

The invention provides a transparent tube liquid monitoring device and method that can prevent misjudgment, including an LED light source, a transparent infusion tube, a photoelectric sensor, a signal modulation and amplification circuit module, an ADC and a back-end processor module, wherein the LED light source uses It is used to provide a light source for the transparent infusion tube; the photoelectric sensor is used to collect the light intensity signal of the transparent infusion tube, convert the collected light intensity signal into a current signal, and transmit the current signal to the signal modulation and amplification circuit module; signal modulation and The amplifying circuit module is used to convert the current signal into a voltage signal, which is amplified by the amplifying circuit, and then transmits the amplified signal to the ADC and the back-end processor module; the ADC and the back-end processor module are used to convert the received voltage analog signal The digital signal is converted into a digital signal and processed at the back end; the initial threshold is updated in real time to improve the accuracy of judgment.

Figure 202010121615

Description

Transparent tube liquid monitoring device and method capable of preventing misjudgment
Technical Field
The invention belongs to the field of automatic monitoring of liquid in a pipeline, and particularly relates to a transparent tube liquid monitoring device and method capable of preventing misjudgment.
Background
In the field of automation of instruments and meters, there is an increasing need to judge whether a liquid flows through a transparent pipeline. For example, in technical requirements and detection methods (survey) of chemical oxygen demand (CODCr) water quality on-line automatic monitor issued by ecological environment department of people's republic of china in 2018, it was explicitly proposed: "quality of water automatic monitoring appearance should have unusual information recording, upload and feedback function, if: the alarm of reagent shortage, the alarm of component failure, the alarm of liquid leakage, the alarm of sampling failure, the alarm of standard exceeding and the like. For another example, the infusion alarm applied to the medical field can monitor whether liquid exists in an infusion tube in real time, and alarm in time when the liquid is deficient so as to remind of changing the liquid.
The sensor technology which can be applied at present mainly comprises a capacitance type sensor and a photoelectric type sensor, and an integrated sensor generally comprises a knob which can adjust a detection threshold value. The capacitive sensor has high sensitivity when used for detecting the liquid state in the pipeline, but when other metals exist around the sensor, the sensor is influenced by the metals, which puts high requirements on the installation of the sensor in the instrument. The photoelectric sensor has the basic principle that light emitted by an LED transmits through a transparent tube, the other side of the transparent tube detects light intensity by a photoelectric sensor and converts the light intensity into an electric signal, and the electric signal is compared with a preset electric signal so as to output a changed electric signal. The photoelectric liquid sensor has the biggest defect that the LED and the photoelectric sensor have larger temperature drift, the light transmittance of liquid in the transparent tube can be changed, and the real-time adjustment can not be carried out once the judgment threshold value is set. When the temperature drift is too large or the light transmittance of the transparent tube is greatly changed, the signal amplitudes of the liquid state and the liquid-free state may be simultaneously greater than or less than the set judgment threshold, and the output signal of the photoelectric liquid sensor may be subjected to misjudgment. Although integrated photosensors generally have the function of manually adjusting the threshold value, the above-mentioned problems cannot be solved completely in real time.
Disclosure of Invention
The invention aims to provide a transparent tube liquid monitoring device and method capable of preventing misjudgment, and solves the problem that misjudgment is easy to occur in a method for monitoring whether liquid exists in a transparent tube in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a transparent tube liquid monitoring device capable of preventing misjudgment, which comprises an LED light source, a transparent infusion tube, a photoelectric sensor, a signal modulation and amplification circuit module, an ADC and a rear-end processor module, wherein the LED light source is used for providing a light source for the transparent infusion tube; the photoelectric sensor is used for collecting a light intensity signal of the transparent infusion tube, converting the collected light intensity signal into a current signal and transmitting the current signal to the signal modulation and amplification circuit module; the signal modulation and amplification circuit module is used for converting the current signal into a voltage signal, amplifying the voltage signal through the amplification circuit, and then transmitting the amplified signal to the ADC and the back-end processor module; the ADC and back-end processor module is used for converting the received voltage analog signal into a digital signal and performing back-end processing, and is used for realizing real-time updating of the set judgment threshold value.
Preferably, the LED light source is an infrared light source.
Preferably, the photosensor is a photocell, photodiode, or phototransistor.
A transparent tube liquid monitoring method capable of preventing misjudgment comprises the following steps:
s1, initializing the device and determining an initial threshold;
s2, monitoring the transparent infusion tube to be detected to obtain an electric signal value, and comparing the electric signal value with the initial threshold value determined in the step S1, wherein if the measured electric signal value is larger than the initial threshold value, the transparent infusion tube to be detected is judged to have liquid, the initial threshold value is calculated and updated according to the measured electric signal value, and the updated threshold value is used as the judgment threshold value for the next judgment; if the measured electric signal value is smaller than the initial threshold value, judging that the transparent infusion tube to be measured has no liquid, calculating and updating the initial threshold value according to the measured electric signal value, and simultaneously taking the updated threshold value as a judgment threshold value for next judgment; and if the measured electric signal value is equal to the initial threshold value, judging the abnormal state and judging again.
Preferably, in step S1, the specific method for determining the initial threshold is:
s101, collecting the intensity of an electric signal in a liquid-free state in a transparent infusion tube, and recording the intensity as Vr 1;
s102, collecting the intensity of an electric signal when the transparent infusion tube is in a liquid state, and recording the intensity as Vr 2;
s103, a device initialization threshold Vr is calculated from S101 and S102, and initialization of the device is completed, where Vr ═ (Vr1+ Vr 2)/2.
Preferably, in step S2, the initial threshold is calculated and updated according to the measured electrical signal value by:
if the measured electrical signal value is greater than the initial threshold value, assigning the measured electrical signal value to Vr 2;
if the measured electrical signal value is less than the initial threshold value, the measured electrical signal value is assigned to Vr 1.
Compared with the prior art, the invention has the beneficial effects that:
according to the transparent tube liquid monitoring device capable of preventing misjudgment, the system can quantify the amplitude of a signal when liquid exists or does not exist in the transparent tube according to the difference of the light transmittance when the liquid exists or does not exist in the transparent tube. The device uses the scheme of optical principle detection, has realized the non-contact monitoring of liquid state in the pipe, has avoided the condition that probe and liquid take place electrochemical corrosion and chemical corrosion than contact monitoring. The device uses the light-emitting light source as an infrared light source, and if the light source is a light source with a visible waveband, the light source is easily absorbed by liquid flowing through the transparent tube, so that the monitoring process is interfered. The device uses an infrared light source as an LED, and mainly considers that the infrared LED has low cost and simple use in engineering application occasions; for use with a light source, the sensor also uses a photoelectric sensor whose detection wavelength band response band contains the light emission wavelength band of the light source.
A transparent tube liquid monitoring method capable of preventing misjudgment determines a threshold value for judging the liquid state in the next transparent tube according to a signal amplitude corresponding to the state of liquid or no liquid in the transparent tube; the judgment threshold value is refreshed in real time along with the change of the signal amplitude value in each state judgment, so that the aim of dynamically calibrating the judgment threshold value is fulfilled, and the misjudgment condition caused by the fact that the signal amplitude has large drift for a long time and the threshold value cannot be adjusted in real time is prevented.
Further, since the system does not have pre-stored signal amplitudes corresponding to the liquid-filled and liquid-free states, an initialization operation is required. And respectively recording signal amplitudes corresponding to a liquid state and a liquid-free state for the first time in the initialization process, and calculating a judgment threshold value for the first time. After the initialization is finished, the state of liquid or no liquid in the transparent tube can be judged for the first time according to the threshold value determined during the initialization.
Furthermore, when liquid exists in the transparent tube, the liquid and the transparent tube focus the light source together, so that the light transmittance of the transparent tube is strong, and the signal amplitude is relatively large; conversely, the corresponding detected signal amplitude is relatively small when the liquid is free of liquid. The threshold value set by the principle is between the corresponding signal amplitude when liquid exists in the transparent tube and the corresponding signal amplitude when no liquid exists in the transparent tube. When liquid exists in the transparent tube, the liquid is detected again, and the corresponding signal amplitude is larger than the previously set signal amplitude; when no liquid exists in the transparent tube, the detection is carried out again, and the corresponding signal amplitude is smaller than the previously set signal amplitude. This enables the judgment to be accurate.
In summary, the transparent tube liquid monitoring device and method capable of preventing erroneous judgment provided by the present invention utilize the ADC and the back-end processor module to convert the voltage analog signal collected by the photoelectric sensor into a digital signal, and then the digital signal is processed by the back-end processor to update the initial threshold in real time, so as to improve the judgment accuracy.
Drawings
FIG. 1 is a schematic diagram of a monitoring device according to the present invention;
fig. 2 is a schematic flow chart of a monitoring method according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the transparent tube liquid monitoring device capable of preventing misjudgment provided by the invention comprises an LED light source 1, a transparent infusion tube 2, a photoelectric sensor 3, a signal modulation and amplification circuit module 4, an ADC and a rear-end processor module 5, wherein the LED light source 1 is used for providing a light source for the transparent infusion tube 2; the photoelectric sensor 3 is used for collecting a light intensity signal of the transparent infusion tube 2, converting the collected light intensity signal into a current signal and transmitting the current signal to the signal modulation and amplification circuit module 4; the signal modulation and amplification circuit module 4 is used for converting the current signal into a voltage signal, amplifying the voltage signal by an amplification circuit, and transmitting the amplified signal to the ADC and the back-end processor module 5; the ADC and back-end processor module 5 converts the received voltage analog signal into a digital signal and performs back-end processing.
The LED light source is an infrared light source.
The photoelectric sensor is a photocell, a photodiode or a phototriode.
The current signal generated by the photoelectric sensor is converted into a small voltage signal through an I-V conversion circuit, and the small voltage signal is converted into a voltage signal belonging to the ADC input voltage range through an amplifying circuit.
The amplified voltage signal is accessed to an ADC; the ADC is connected with the back-end processor through a bus, and the voltage signal amplitude detected by the ADC is transmitted to the back-end processor through the bus for processing, calculation and judgment.
As shown in fig. 2, the working process of the present invention includes the following steps:
step 1, starting equipment;
step 2, collecting the electric signal intensity of the transparent infusion tube 2 in the initial state, and recording the electric signal intensity as Vr 1; the transparent infusion tube 2 is in an initial state that no liquid exists in the transparent infusion tube;
step 3, injecting liquid into the transparent infusion tube 2, collecting the electric signal intensity in the state, and recording the electric signal intensity as Vr 2;
step 4, calculating the initial threshold Vr of the equipment according to the step 2 and the step 3, and finishing the initialization of the equipment; wherein, Vr ═ is (Vr1+ Vr 2)/2;
step 5, starting to monitor whether liquid exists in the transparent infusion tube, specifically: comparing the monitored electric signal value v1 with an initial threshold value, and if the electric signal value v1 is smaller than the initial threshold value; judging that the transparent tube is not filled with liquid, giving the value of the electric signal value v1 to Vr1 during initialization, and recalculating and updating the threshold Vr to be (Vr1+ Vr 2)/2; if v1 is larger than Vr, judging that liquid exists in the transparent tube, giving the value of the electric signal value v1 to Vr2, and recalculating and updating the threshold Vr to be (Vr1+ Vr 2)/2; if v1 is equal to Vr, the judgment is determined to be abnormal, and the judgment is re-made without any processing.
And repeating the measuring procedure for judging whether liquid exists in the transparent tube, comparing the monitored electric signal value v with the updated threshold value Vr, and updating the threshold value Vr according to the comparison result, so that the effects of judging whether liquid exists in the transparent tube in real time and judging whether the voltage threshold value of the liquid exists in real time through real-time calibration are achieved.
The signal threshold of the photoelectric sensor is readjusted according to each judgment result, so that the real-time updating of the judgment threshold is realized. In the field of automatic instruments which cannot be adjusted in real time, the threshold value is adjusted in real time, and the accuracy of judgment can be greatly improved.
The conventional photoelectric sensor generally does not use an ADC, but uses a comparator to output high and low levels for judgment. The judgment threshold of the comparator is manually adjusted and cannot be updated in real time. The method is applied in the application fields of instruments and meters for a long time, and abnormal judgment can occur after the light transmittance changes or the semiconductor device drifts.

Claims (6)

1.一种可防误判的透明管液体监测装置，其特征在于，包括LED光源(1)、透明输液管(2)、光电传感器(3)、信号调制及放大电路模块(4)、ADC及后端处理器模块(5)，其中，LED光源(1)用于向透明输液管(2)提供光源；光电传感器(3)用于采集透过透明输液管(2)的光强信号，并将采集到的光强信号转化为电流信号，同时将电流信号传输至信号调制及放大电路模块(4)；信号调制及放大电路模块(4)用于将电流信号转换成电压信号，经过放大电路进行放大，之后将放大信号传输至ADC及后端处理器模块(5)；ADC及后端处理器模块(5)用于将接收到的电压模拟信号转换成数字信号并进行后端处理，用于实现对设定的判断阈值的实时更新。1. A transparent tube liquid monitoring device capable of preventing misjudgment, characterized in that it comprises an LED light source (1), a transparent infusion tube (2), a photoelectric sensor (3), a signal modulation and amplification circuit module (4), an ADC and a back-end processor module (5), wherein the LED light source (1) is used to provide a light source to the transparent infusion tube (2); the photoelectric sensor (3) is used to collect the light intensity signal passing through the transparent infusion tube (2), The collected light intensity signal is converted into a current signal, and the current signal is transmitted to the signal modulation and amplification circuit module (4) at the same time; the signal modulation and amplification circuit module (4) is used for converting the current signal into a voltage signal, and after amplification The circuit amplifies, and then transmits the amplified signal to the ADC and the back-end processor module (5); the ADC and the back-end processor module (5) are used to convert the received voltage analog signal into a digital signal and perform back-end processing, It is used to realize the real-time update of the set judgment threshold. 2.根据权利要求1的可防误判的透明管液体监测装置，其特征在于，LED光源为红外光源。2 . The transparent tube liquid monitoring device capable of preventing misjudgment according to claim 1 , wherein the LED light source is an infrared light source. 3 . 3.根据权利要求1的可防误判的透明管液体监测装置，其特征在于，光电传感器为光电池、光电二极管或光电三极管。3. The transparent tube liquid monitoring device capable of preventing misjudgment according to claim 1, wherein the photoelectric sensor is a photocell, a photodiode or a phototransistor. 4.一种可防误判的透明管液体监测方法，其特征在于，包括以下步骤：4. A transparent tube liquid monitoring method that can prevent misjudgment, is characterized in that, comprises the following steps: S1、对权利要求1至3中任一项所述装置进行初始化处理，确定初始阈值；S1. Perform initialization processing on the device according to any one of claims 1 to 3 to determine an initial threshold; S2、对待测透明输液管进行监测，得到电信号值，并将该电信号值与步骤S1中确定的初始阈值进行比对，其中，若测得的电信号值大于初始阈值时，则判断该待测透明输液管有液体，并根据该测得的电信号值计算并更新初始阈值，同时将更新后的阈值作为下次判断的判断阈值；若测得的电信号值小于初始阈值时，则判断该待测透明输液管无液体，并根据该测得的电信号值计算并更新初始阈值，同时将更新后的阈值作为下次判断的判断阈值；若测得的电信号值等于初始阈值时，则该判断异常，重新进行判断。S2. Monitor the transparent infusion tube to be measured to obtain an electrical signal value, and compare the electrical signal value with the initial threshold value determined in step S1, wherein, if the measured electrical signal value is greater than the initial threshold value, determine the electrical signal value. There is liquid in the transparent infusion tube to be tested, and the initial threshold is calculated and updated according to the measured electrical signal value, and the updated threshold is used as the judgment threshold for the next judgment; if the measured electrical signal value is smaller than the initial threshold, then It is judged that the transparent infusion tube to be tested has no liquid, and the initial threshold is calculated and updated according to the measured electrical signal value, and the updated threshold is used as the judgment threshold for the next judgment; if the measured electrical signal value is equal to the initial threshold , the judgment is abnormal, and the judgment is made again. 5.根据权利要求4的方法，其特征在于，步骤S1中，确定初始阈值的具体方法是：5. The method according to claim 4, characterized in that, in step S1, the concrete method for determining the initial threshold is: S101，采集透明输液管中无液体状态时的电信号强度，并记录为Vr1；S101, collecting the electrical signal intensity when there is no liquid in the transparent infusion tube, and recording it as Vr1; S102，采集透明输液管中有液体状态时的电信号强度，并记录为Vr2；S102, collect the electrical signal intensity when there is liquid in the transparent infusion tube, and record it as Vr2; S103，根据S101和S102计算设备初始阈值Vr，完成设备的初始化，其中，Vr＝(Vr1+Vr2)/2。S103, calculate the initial threshold value Vr of the device according to S101 and S102, and complete the initialization of the device, where Vr=(Vr1+Vr2)/2. 6.根据权利要求4的方法，其特征在于，步骤S2中，根据该测得的电信号值计算并更新初始阈值，具体方法是：6. The method according to claim 4, characterized in that, in step S2, the initial threshold is calculated and updated according to the measured electrical signal value, and the specific method is: 若测得的电信号值大于初始阈值时，则将该测得的电信号值赋值给Vr2；If the measured electrical signal value is greater than the initial threshold, assign the measured electrical signal value to Vr2; 若测得的电信号值小于初始阈值时，则将该测得的电信号值赋值给Vr1。If the measured electrical signal value is less than the initial threshold, the measured electrical signal value is assigned to Vr1.
CN202010121615.5A 2020-02-26 2020-02-26 A transparent tube liquid monitoring device and method that can prevent misjudgment Pending CN111208094A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010121615.5A CN111208094A (en) 2020-02-26 2020-02-26 A transparent tube liquid monitoring device and method that can prevent misjudgment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010121615.5A CN111208094A (en) 2020-02-26 2020-02-26 A transparent tube liquid monitoring device and method that can prevent misjudgment

Publications (1)

Publication Number Publication Date
CN111208094A true CN111208094A (en) 2020-05-29

Family

ID=70785605

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010121615.5A Pending CN111208094A (en) 2020-02-26 2020-02-26 A transparent tube liquid monitoring device and method that can prevent misjudgment

Country Status (1)

Country Link
CN (1) CN111208094A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115854265A (en) * 2022-12-29 2023-03-28 深圳迎凯生物科技有限公司 Pipeline state detection method and mechanism

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202314708U (en) * 2011-11-28 2012-07-11 陕西科技大学 Liquid detection device based on photoelectric detection technology
CN103212134A (en) * 2013-04-10 2013-07-24 赵天锋 Device and method for processing transfusion signal
CN203329130U (en) * 2013-03-21 2013-12-11 徐州医学院 Intelligent infusion pressure speed-detecting device
CN203342139U (en) * 2013-06-21 2013-12-18 苏均生 Intelligent infusion alarm apparatus
CN104552609A (en) * 2014-12-08 2015-04-29 徐州徐工筑路机械有限公司 Formula setting quantity follow-up adjustment system and formula setting quantity follow-up adjustment method
US20160055397A1 (en) * 2011-12-21 2016-02-25 Deka Products Limited Partnership System, Method, and Apparatus for Monitoring, Regulating, or Controlling FLuid Flow
CN107569739A (en) * 2017-07-17 2018-01-12 福建星网锐捷通讯股份有限公司 Detection method and device for the capacitance inductor of woven hose liquid detecting
CN109764936A (en) * 2019-01-24 2019-05-17 湖北科技学院 A kind of double liquid level alarm method of Murphy pot

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202314708U (en) * 2011-11-28 2012-07-11 陕西科技大学 Liquid detection device based on photoelectric detection technology
US20160055397A1 (en) * 2011-12-21 2016-02-25 Deka Products Limited Partnership System, Method, and Apparatus for Monitoring, Regulating, or Controlling FLuid Flow
CN203329130U (en) * 2013-03-21 2013-12-11 徐州医学院 Intelligent infusion pressure speed-detecting device
CN103212134A (en) * 2013-04-10 2013-07-24 赵天锋 Device and method for processing transfusion signal
CN203342139U (en) * 2013-06-21 2013-12-18 苏均生 Intelligent infusion alarm apparatus
CN104552609A (en) * 2014-12-08 2015-04-29 徐州徐工筑路机械有限公司 Formula setting quantity follow-up adjustment system and formula setting quantity follow-up adjustment method
CN107569739A (en) * 2017-07-17 2018-01-12 福建星网锐捷通讯股份有限公司 Detection method and device for the capacitance inductor of woven hose liquid detecting
CN109764936A (en) * 2019-01-24 2019-05-17 湖北科技学院 A kind of double liquid level alarm method of Murphy pot

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115854265A (en) * 2022-12-29 2023-03-28 深圳迎凯生物科技有限公司 Pipeline state detection method and mechanism
CN115854265B (en) * 2022-12-29 2025-04-04 深圳迎凯生物科技有限公司 Pipeline status detection method and mechanism

Similar Documents

Publication Publication Date Title
CN103969222B (en) A kind of measuring method of the non-gate liquid turbidity measurement mechanism based on Single Photon Counting
CN201155969Y (en) Device for Measuring Straightness of Rectangular Guide Rail Using Two-Dimensional PSD Position Sensor
CN104122231B (en) On-line self-calibration water quality turbidity detection system
CN110907876B (en) Optical fiber current sensor fault diagnosis system and diagnosis method thereof
CN101566551A (en) Backscatter Smoke Analyzer
CN103776529A (en) Desktop laser power meter capable of real-time compensation and compensation method thereof
CN103674882A (en) Non-dispersive infrared light gas detection system
CN104916083A (en) Internet of things based intelligent combustible gas inspection detector and calibration method thereof
CN111208094A (en) A transparent tube liquid monitoring device and method that can prevent misjudgment
CN103354028B (en) Intelligent testing height device and method based on infrared light curtain
CN204101451U (en) A kind of portable infrared spectrophotometer
CN105352865A (en) PM2.5 sensor based on infrared photovoltaic conversion and PM2.5 detection method
CN1073178C (en) Instrument for measuring and controlling wood pulp concentration
CN201837484U (en) Temperature measuring device based on Raman light reflection
CN207649766U (en) Faint light current detection circuit
CN214372916U (en) Photoelectric signal segmentation detection and acquisition device
CN203772412U (en) Desk type laser power meter capable of real-time compensation
CN104865231B (en) A kind of Multi-channel optical dissolved oxygen sensing method
CN204924451U (en) Microwave power device transient state temperature measuring system
CN209416914U (en) Forward scattering visibility meter linearity detection device
CN211978695U (en) Weak signal acquisition device based on fluorescent polymer sensing technology
CN209280556U (en) Protect adjustable gas probe, optical fiber gas concentration measuring system
CN202974444U (en) Portable photoelectric color measuring instrument
CN111693422A (en) Real-time calibrating device of turbidity method laser dust meter
CN212963721U (en) Temperature measuring instrument

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20200529

RJ01 Rejection of invention patent application after publication