CN102608173A - Wide humidity environment-friendly humidity sensing device and control method thereof - Google Patents
Wide humidity environment-friendly humidity sensing device and control method thereof Download PDFInfo
- Publication number
- CN102608173A CN102608173A CN2012100431287A CN201210043128A CN102608173A CN 102608173 A CN102608173 A CN 102608173A CN 2012100431287 A CN2012100431287 A CN 2012100431287A CN 201210043128 A CN201210043128 A CN 201210043128A CN 102608173 A CN102608173 A CN 102608173A
- Authority
- CN
- China
- Prior art keywords
- humidity
- data
- microprocessor
- sensor
- sensing device
- 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
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a wide humidity environment-friendly humidity sensing device and a control method of the wide humidity environment-friendly humidity sensing device. The device comprises a microprocessor and a humidity sensing module, wherein the humidity sensing module is connected with the microprocessor, and comprises a capacitance-type humidity sensing element and a NTC (negative temperature coefficient) temperature measuring unit; and a monobus data transmission manner is adopted in the microprocessor and the humidity sensing module. According to the invention, a new-type humidity sensitive element made of organic polymer material is adopted, has the characteristics of wide humidity sensing range, rapid response and strong anti-pollution ability, no need of heating and cleaning, and stable and reliable performance in long-time use and the like; and except a sensor and a ceramic feed through seat, components contacted with water are stainless steel materials. The wide humidity environment-friendly humidity sensing device provided by the invention has absolute advantages compared with a humistor in the market, and simultaneously, has the characteristics of high cost performance, low energy consumption, better pollution resistance, quick response time, excellent linearity, high reliability and long-time stability, and capability of being used for linear voltage or frequency output, rapidness in dehumidification under long-time saturation and the like.
Description
Technical field
The present invention relates to sensor technical field, particularly a kind of reliability is high, antijamming capability is strong, stability is high wide humidity environment-friendly type humidity sensing device and control method thereof.
Background technology
At present, the humidity sensor product level of each producer differs both at home and abroad, and it is bigger that the quality price all differs, and how the user selects the optimum ideal product of the ratio of performance to price to truly have certain difficulty.Occurred many humidity sensor products both at home and abroad on the home market, capacitive moisture sensor comparatively more sees that the wet sensory material kind is mainly high molecular polymer, lithium chloride and metal oxide.The advantage of capacitive moisture sensor is that response speed is fast, volume is little, the linearity is good, more stable, and abroad some product also possesses high-temperature working performance.But mostly the product that reaches above-mentioned performance is external famous brand, and price is all expensive.Some capacitive moisture sensors of selling on the market are product at a low price; Often do not reach above-mentioned level; The linearity, consistance and repeatability are all not satisfactory, and the wet section distortion of (RH is relative humidity, i.e. relative humidity) below the 30%RH, the above sense of 80%RH is serious.Some product adopts the single-chip microcomputer compensation to revise, but makes humidity the jump of " step " property occur easily, and precision is reduced; Also can cause simultaneously poor, the linear poor shortcoming of consistance.No matter high-grade or low-grade capacitive moisture sensor; Long-time stability are all undesirable, and most long-term uses are drifted about seriously, and humicap appearance value is changed to the pF level; The deficient change 0.5pF of 1%RH; The drift of appearance value changes the error that often causes tens RH%, and most of capacitive moisture sensors do not possess the performance of working under the temperature more than 40 ℃, often loses efficacy easily and damage.The capacitive moisture sensor resistance to corrosion also is short of, and often the cleanliness factor of environment is had relatively high expectations, and also there are phenomenons such as illumination inefficacy, static inefficacy in the product that has; Metal oxide is ceramic hygristor, has the identical advantage of humicap, but under the dust environment; The pottery pore will be lost efficacy by the shutoff element, often adopt the method for energising dedusting to handle, but effect was not ideal enough; And under inflammable and explosive environment, can not use; The aluminium oxide wet sensory material can't overcome the weakness of its surface structure " natural weathering ", and impedance is unstable, and there is the weakness of long-time stability difference too in metal oxygen thing pottery hygristor.Other wet sensory material of the long-time stability of lithium chloride humidity-sensitive element still can't replace.
The product competition of home and abroad gets very fierceness now, specifically still sees performance, stability; And employed moisture probe, current, state inner sensor producer quantity is very many; But still lack top famous brand name, the high-end product field is occupied by foreign brand name, and most of producer accumulates in the low-end product field; Lack core technology simultaneously, research and production break away from.
Summary of the invention
First purpose of the present invention is, the wide humidity environment-friendly type humidity sensing device that a kind of reliability is high, antijamming capability is strong, stability is high is provided.
Second purpose of the present invention is, a kind of control method based on above-mentioned wide humidity environment-friendly type humidity sensing device is provided.
In order to reach above-mentioned first goal of the invention, the present invention adopts following technical scheme:
A kind of wide humidity environment-friendly type humidity sensing device, the humidity sensor module that comprises microprocessor and be connected with microprocessor, said humidity sensor module comprise wet element of condenser type sense and NTC (negative temperature coefficient) temperature measuring unit; Said microprocessor and humidity sensor module adopt the unibus data transfer mode.
Preferably, the wet element of said condenser type sense is the wet element of inorganic thin film polyimide type sense, and the substrate coated feel wet stock of the wet element of condenser type sense forms the humidity-sensitive film structure.
Preferably, the electric capacity of the wet element of said condenser type sense and humidity change 0.30pf/%RH; Representative value is 117pf55%RH.
Preferably, said NTC temperature measuring unit comprises lithium chloride and metal oxide semi-conductive layer, and copper alloy tube is set on semi-conductive layer, and the polystrene insulaion layer is set on the copper alloy tube.
Preferably, also comprise a pull-up resistor, said pull-up resistor one end connects power supply, and the other end connects microprocessor.
When preferably, wiring is shorter in length than 20 meters with 5.1k Ω pull-up resistor; When being longer than 20 meters, wiring length reduces the resistance of pull-up resistor according to actual conditions.
Preferably, communication time 5ms of said unibus data transfer mode once transmits 40 bit data, and a high position goes out earlier.
Preferably, the wet element of condenser type sense is the encapsulation of anodised aluminium shell.
In order to reach above-mentioned second purpose, the present invention adopts following technical scheme:
The present invention is based on the control method of above-mentioned wide humidity environment-friendly type humidity sensing device, comprise the steps:
(1) 1S to be waited for after powering on, the situation of any instruction can not be sent during this period to cross non-steady state, test environment humiture data, and record data, the DATA data line of sensor is drawn high by pull-up resistor and is kept high level always simultaneously; This moment, the DATA pin of sensor was in input state, detected external signal constantly;
(2) communication between microprocessor and the sensor is adopted the unibus data layout, communication time a 3～5ms with synchronously;
(3) I/O of microprocessor is set to output; The while output low level; And the low level retention time is not less than 500us, and the I/O of microprocessor is set to input state then, because pull-up resistor; The I/O of microprocessor is that the DATA data line of AM2302 also uprises thereupon, and the wait sensor is made recall signal;
When (4) the DATA pin of sensor detects external signal low level is arranged, wait for that the external signal low level finishes, the DATA pin that postpones the back sensor is in output state; The low level of exporting 80 microseconds is as answer signal; And then export the high level notice peripheral hardware of 80 microseconds and prepare to receive data, the I/O of microprocessor is in input state at this moment, after detecting I/O low level being arranged; Be the sensor back-signalling, wait for the Data Receiving behind the high level of 80 microseconds;
(5) export 40 bit data by the DATA pin of sensor, microprocessor receives 40 bit data according to the variation of I/O level;
(6) after the DATA pin of sensor is exported 40 bit data, continue to transfer input state to after output low level 50 microseconds, because pull-up resistor becomes high level thereupon, the ambient temperature and humidity data but resurvey in AM2303 inside, and record data are waited for the arrival of external signal.
The present invention has following advantage and effect with respect to prior art:
1, capacitor type humidity sensor of the present invention is a kind of novel humidity sensing element that adopts high-molecular organic material, and it is wide to have a humidity sensing range, response rapidly, contamination resistance is strong, need not many characteristics such as heated wash and long-term usability be reliable and stable.And outside sensor and its ceramic feedthrough seat, wherein each components and parts that contact with water are stainless steel material.Have high performance-price ratio, low, the better resistance tocrocking of energy consumption, fast reflect time, good linearity, high reliability and long-time stability, can be used for linear voltage or characteristics such as frequency output, long-time saturated quick dehumidification down.
2, in single-chip microcomputer or microprocessor, sensor internal will call these calibration factors to capacitor type humidity sensor modular calibration coefficient of the present invention in the processing procedure of detection signal with the stores of program.Employing standard single bus interface makes the system integration become simple and easy quick; Extra small volume, extremely low power consumption, signal transmission distance can reach more than 20 meters, makes its best choosing that becomes types of applications even the harshest application scenario then.
3, capacitor type humidity sensor module of the present invention adopts the unibus communication of simplifying, and unibus promptly has only a data lines, and the exchanges data in the system, control are accomplished by unibus.Equipment (main frame or slave) is connected to this data line through an open-drain or ternary port, when not sending data, can discharge bus with permission equipment, and lets miscellaneous equipment use bus; Unibus requires the pull-up resistor of an external about 5.1k Ω usually, and like this, when bus was idle, its state was a high level.Because they are host-guest architectures, when having only main frame to call out slave, slave just can be replied, so the host access device all must strictness follow the unibus sequence, if sequence is chaotic, device will not respond main frame.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a process flow diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is done further explain, but embodiment of the present invention is not limited thereto.
Embodiment
As shown in Figure 1; A kind of wide humidity environment-friendly type humidity sensing device of present embodiment; The humidity sensor module that comprises microprocessor and be connected with microprocessor is characterized in that, said humidity sensor module comprises wet element of condenser type sense and NTC (negative temperature coefficient) temperature measuring unit; Said microprocessor and humidity sensor module adopt the unibus data transfer mode.
The said condenser type sense element that wets is a kind of a kind of novel humidity sensing element of high-molecular organic material, and it is wide to have a humidity sensing range, response rapidly, contamination resistance is strong, need not many characteristics such as heated wash and long-term usability be reliable and stable.And have quick reflection time, good linearity, high reliability and long-time stability, can be used for linear voltage or characteristics such as frequency output, long-time saturated quick dehumidification down, wherein the humicap element based on unique technological design is that core is crucial.Electric capacity and humidity change 0.30pf/%RH; Representative value 117pf55%RH; Have long-time stability and reliability.The wet component size of said condenser type sense is small and exquisite; And the anodic oxidation aluminum shell that is of a size of 11.85 * 7.5mm packing forms is provided; 7um metal sintering protection net is that humidity sensor provides perfect protection, makes it have Effect of Environmental such as not receiving dust, greasy dirt and chemical gas.The wet element of condenser type sense is a kind of high-performance inorganic film polyimide type wet sensitive device; Be employed in substrate coated feel wet stock and form humidity-sensitive film structure condenser type film wet sensitive device; On magnetic basement, substitute the technology that the InSb single crystal vapor deposition is made polycrystalline film; Reduce cost, improved yield rate.Adopt the selectivity wet-etching technology simultaneously, the synthetic province's quinone free radical superpolymer that gathers is crossed the material surface process etc. techniques and is processed, and the specific inductive capacity that reaches humicap changes, and its electric capacity is also changed, and its capacitance change is directly proportional with relative humidity.
The working range of the wet element of present embodiment condenser type sense: 0～99%RH ,-40～125 ℃; Supply voltage: 10V AC (Max); Nominal appearance value (25 ℃/60%RH): 120 ± 10pF; Average sensitivity (5%～95%): 0.30pF (MIN 0.27, and MAX 0.33) %RH; Temperature effect (25 ℃) :+1 ℃ ,+0.015pF; Dissipation facot (25 ℃, 60%RH):＜0.01 humidity hysteresis return difference:＜0.5%RH; Linear error (5%～95%):＜± 1%RH; Reaction time:＜10 seconds; Frequency of operation: 5k～100kHz (recommending 20kHz); 150 hours release times dewfall:＜20 seconds; Long-time stability (year drift value):＜0.5%RH/.
In single-chip microcomputer or microprocessor, sensor internal will call these calibration factors to the wet element calibration factor of present embodiment condenser type sense in the processing procedure of detection signal with the stores of program.Employing standard single bus interface makes the system integration become simple and easy quick.Extra small volume, extremely low power consumption, signal transmission distance can reach more than 20 meters, makes its best choosing that becomes types of applications even the harshest application scenario then.Simultaneously single bus interface makes DATA be used for communication between microprocessor and the sensor with synchronously, adopts the unibus data layout, and about a communication time 5ms, a high position goes out earlier.
Present embodiment capacitor type humidity sensor module adopts the unibus communication of simplifying, and unibus promptly has only a data lines, and the exchanges data in the system, control are accomplished by unibus.Equipment (main frame or slave) is connected to this data line through an open-drain or ternary port, when not sending data, can discharge bus with permission equipment, and lets miscellaneous equipment use bus; Unibus requires the pull-up resistor of an external about 5.1k Ω usually, and like this, when bus was idle, its state was a high level.Because they are host-guest architectures, when having only main frame to call out slave, slave just can be replied, so the host access device all must strictness follow the unibus sequence, if sequence is chaotic, device will not respond main frame.
The NTC temperature measuring unit is to comprise lithium chloride and metal oxide semi-conductive layer; The little copper alloy tube of permittivity and capacitance temperature factor is set on semi-conductive layer; Set gradually the polystrene insulaion layer on the copper alloy tube, its electric capacity is also changed, its capacitance change is directly proportional with relative humidity.
Communication time 5ms of said unibus data transfer mode once transmits 40 bit data, and a high position goes out earlier.
Wide humidity environment-friendly type humidity sensing device also comprises a pull-up resistor in the present embodiment, and said pull-up resistor one end connects power supply, and the other end connects microprocessor, and when the distance between the line during less than 20 meters, said pull-up resistor is 5.1k Ω; Reduce the resistance of pull-up resistor during greater than 20 meters according to actual conditions.
The control method of the wide humidity environment-friendly type of present embodiment humidity sensing device, as shown in Figure 2, comprise the steps:
(1) back that powers on is waited for and can not be sent the situation of any instruction during this period to cross non-steady state by 1S, test environment humiture data, and record data then, and the DATA data line of sensor is drawn high by pull-up resistor and is kept high level always simultaneously; This moment, the DATA pin of sensor was in input state, detected external signal constantly;
(2) communication between microprocessor and the sensor is adopted the unibus data layout, a communication time 3-5ms with synchronously;
(3) I/O of microprocessor is set to output output low level simultaneously, and the low level retention time can not be less than 500us, and the I/O of microprocessor is set to input state then, and the wait sensor is made recall signal;
(4) sensor is when external signal has low level; Wait for that the external signal low level finishes, the DATA pin that postpones the back sensor is in output state, and the low level of exporting 80 microseconds is as answer signal; And then export the high level notice peripheral hardware of 80 microseconds and prepare to receive data; The I/O of microprocessor is in input state at this moment, detects the sensor back-signalling, waits for the Data Receiving behind the high level of 80 microseconds;
(5) export 40 bit data by the DATA pin of sensor, microprocessor receives 40 bit data according to the variation of I/O level;
(6) after the DATA pin of sensor is exported 40 bit data, continue to transfer input state to after output low level 50 microseconds, because pull-up resistor becomes high level thereupon, the ambient temperature and humidity data but resurvey in AM2303 inside, and record data are waited for the arrival of external signal.
Claims (9)
1. one kind wide humidity environment-friendly type humidity sensing device, the humidity sensor module that comprises microprocessor and be connected with microprocessor is characterized in that, said humidity sensor module comprises wet element of condenser type sense and NTC temperature measuring unit; Said microprocessor and humidity sensor module adopt the unibus data transfer mode.
2. wide humidity environment-friendly type humidity sensing device according to claim 1 is characterized in that, the wet element of said condenser type sense is the wet element of inorganic thin film polyimide type sense, and the substrate coated feel wet stock of the wet element of condenser type sense forms the humidity-sensitive film structure.
3. wide humidity environment-friendly type humidity sensing device according to claim 2 is characterized in that, the electric capacity and the humidity of the wet element of said condenser type sense change 0.30pf/%RH; Representative value is 117pf55%RH.
4. wide humidity environment-friendly type humidity sensing device according to claim 1 is characterized in that said NTC temperature measuring unit comprises lithium chloride and metal oxide semi-conductive layer, and copper alloy tube is set, and the polystrene insulaion layer is set on the copper alloy tube on semi-conductive layer.
5. wide humidity environment-friendly type humidity sensing device according to claim 1 is characterized in that, also comprises a pull-up resistor, and said pull-up resistor one end connects power supply, and the other end connects microprocessor.
6. wide humidity environment-friendly type humidity sensing device according to claim 5 is characterized in that, when wiring is shorter in length than 20 meters with 5.1k Ω pull-up resistor; When being longer than 20 meters, wiring length reduces the resistance of pull-up resistor according to actual conditions.
7. wide humidity environment-friendly type humidity sensing device according to claim 1 is characterized in that communication time 5ms of said unibus data transfer mode once transmits 40 bit data, and a high position goes out earlier.
8. wide humidity environment-friendly type humidity sensing device according to claim 1 is characterized in that, the wet element of said condenser type sense is the encapsulation of anodised aluminium shell.
9. the control method of wide humidity environment-friendly type humidity sensing device according to claim 1 is characterized in that, comprises the steps:
(1) back that powers on is waited for and can not be sent the situation of any instruction during this period to cross non-steady state by 1S, test environment humiture data, and record data, and the DATA data line of sensor is drawn high by pull-up resistor and is kept high level always simultaneously; This moment, the DATA pin of sensor was in input state, detected external signal constantly;
(2) communication between microprocessor and the sensor is adopted the unibus data layout, communication time a 3～5ms with synchronously;
(3) I/O of microprocessor is set to output; The while output low level; And the low level retention time is not less than 500us, and the I/O of microprocessor is set to input state then, because pull-up resistor; The I/O of microprocessor is that the DATA data line of AM2302 also uprises thereupon, and the wait sensor is made recall signal;
When (4) the DATA pin of sensor detects external signal low level is arranged, wait for that the external signal low level finishes, the DATA pin that postpones the back sensor is in output state; The low level of exporting 80 microseconds is as answer signal; And then export the high level notice peripheral hardware of 80 microseconds and prepare to receive data, the I/O of microprocessor is in input state at this moment, after detecting I/O low level being arranged; Be the sensor back-signalling, wait for the Data Receiving behind the high level of 80 microseconds;
(5) export 40 bit data by the DATA pin of sensor, microprocessor receives 40 bit data according to the variation of I/O level;
(6) after the DATA pin of sensor is exported 40 bit data, continue to transfer input state to after output low level 50 microseconds, because pull-up resistor becomes high level thereupon, the ambient temperature and humidity data but resurvey in AM2303 inside, and record data are waited for the arrival of external signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100431287A CN102608173A (en) | 2012-02-23 | 2012-02-23 | Wide humidity environment-friendly humidity sensing device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100431287A CN102608173A (en) | 2012-02-23 | 2012-02-23 | Wide humidity environment-friendly humidity sensing device and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102608173A true CN102608173A (en) | 2012-07-25 |
Family
ID=46525719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100431287A Pending CN102608173A (en) | 2012-02-23 | 2012-02-23 | Wide humidity environment-friendly humidity sensing device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102608173A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865297A (en) * | 2014-02-20 | 2015-08-26 | 钰太芯微电子科技（上海）有限公司 | Humidity detecting circuit and mobile terminal |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1117196A (en) * | 1994-07-16 | 1996-02-21 | 东南大学 | Inorganic thin film humidity-sensitive element with high performance and its producing method |
| CN2718740Y (en) * | 2004-07-22 | 2005-08-17 | 宝胜科技创新股份有限公司 | Electric resistance cable type temperature measuring alarming cable |
| CN2837787Y (en) * | 2005-07-25 | 2006-11-15 | 刘自力 | Temperature and humidity sensor |
| CN101413961A (en) * | 2007-10-19 | 2009-04-22 | 北京中立格林控制技术有限公司 | Multifunctional air environment monitoring control device |
| CN101551277A (en) * | 2009-05-18 | 2009-10-07 | 胡业林 | Array type multipoint temperature monitoring system |
| CN101620197A (en) * | 2009-07-23 | 2010-01-06 | 东南大学 | Rapid response CMOS relative humidity sensor |
| WO2011075971A1 (en) * | 2009-12-23 | 2011-06-30 | 北京宝力马传感技术有限公司 | Humidity measurement device and method |
-
2012
- 2012-02-23 CN CN2012100431287A patent/CN102608173A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1117196A (en) * | 1994-07-16 | 1996-02-21 | 东南大学 | Inorganic thin film humidity-sensitive element with high performance and its producing method |
| CN2718740Y (en) * | 2004-07-22 | 2005-08-17 | 宝胜科技创新股份有限公司 | Electric resistance cable type temperature measuring alarming cable |
| CN2837787Y (en) * | 2005-07-25 | 2006-11-15 | 刘自力 | Temperature and humidity sensor |
| CN101413961A (en) * | 2007-10-19 | 2009-04-22 | 北京中立格林控制技术有限公司 | Multifunctional air environment monitoring control device |
| CN101551277A (en) * | 2009-05-18 | 2009-10-07 | 胡业林 | Array type multipoint temperature monitoring system |
| CN101620197A (en) * | 2009-07-23 | 2010-01-06 | 东南大学 | Rapid response CMOS relative humidity sensor |
| WO2011075971A1 (en) * | 2009-12-23 | 2011-06-30 | 北京宝力马传感技术有限公司 | Humidity measurement device and method |
Non-Patent Citations (2)
| Title |
|---|
| A546103832: "高温型数字温湿度传感器", 《百度文库 HTTP://WENKU.BAIDU.COM/LINK?URL=9F2KWXNTMGWZZSMVLU8IGFDJD6QJCBGWRHMLUBDE0WDVERI-AWI9NJBASGKKMFQ10ERWUNI92XRO4GPG5XWTM8NDKAGMR5FT9VNG12LQ9DM》, 9 May 2010 (2010-05-09) * |
| WHZHEYU: "温湿度模块AM2302产品手册", 《百度文库 HTTP://WENKU.BAIDU.COM/VIEW/A96CFAEDF8C75FBFC77DB271.HTML?RE=VIEW》, 25 September 2011 (2011-09-25) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865297A (en) * | 2014-02-20 | 2015-08-26 | 钰太芯微电子科技（上海）有限公司 | Humidity detecting circuit and mobile terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101903755B (en) | Liquid level sensing device and method | |
| CN102062662B (en) | Monolithic integrated SiC MEMS (Micro-Electro-Mechanical Systems) pressure sensor and production method thereof | |
| WO2007115055A3 (en) | Modular sensor system for measuring multiple measurands in a common package | |
| CN103487474B (en) | A kind of have the MEMS capacitive humidity sensor that high sensitivity quickly responds | |
| WO2011074911A3 (en) | Touch cell structure of a touch panel and the touch panel using the same | |
| CN101512331B (en) | Method and apparatus for controlling sensitivity and value of capacitive humidity sensor | |
| WO2004001662A3 (en) | Touch sensor | |
| CN206818338U (en) | Pressure sensitive component and the electronic equipment with the pressure sensitive component | |
| CN208653681U (en) | Pressure sensitive component and electronic equipment | |
| CN106959169B (en) | A kind of novel and multifunctional sensor chip and preparation method thereof | |
| CN101241786A (en) | NTC film heat sensitive resistance and its making method | |
| CN203606311U (en) | Heating type humidity sensor | |
| Costa et al. | Hand‐Drawn Resistors, Capacitors, Diodes, and Circuits for a Pressure Sensor System on Paper | |
| CN104062025A (en) | Energy-saving automatic AD temperature collecting monitoring system | |
| CN102608173A (en) | Wide humidity environment-friendly humidity sensing device and control method thereof | |
| CN201203591Y (en) | Low-power consumption thermal insulation double-module integrated humidity sensor chip with heat purification function | |
| CN106841315B (en) | A kind of MEMS humidity sensor based on directional coupling structure | |
| CN103236429A (en) | Miniature carbon nano pipe humidity sensor chip with heating unit | |
| CN203745081U (en) | Extremely-low-lost adjustable-detection-range light intensity detection circuit | |
| CN1210565C (en) | Miniature humidity sensor | |
| CN202853789U (en) | Temperature measurement sensor | |
| CN204154676U (en) | A kind of methane transducer based on flip chip bonding encapsulation | |
| CN201016951Y (en) | Low-cost humidity transducer | |
| CN104655691A (en) | A capacitive relative-humidity sensor | |
| CN209541790U (en) | A kind of pipeline thread installing type Temperature Humidity Sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120725 |