CN211553847U - Non-contact type sensing device for monitoring peculiar smell change of refrigerator - Google Patents
Non-contact type sensing device for monitoring peculiar smell change of refrigerator Download PDFInfo
- Publication number
- CN211553847U CN211553847U CN201922388219.4U CN201922388219U CN211553847U CN 211553847 U CN211553847 U CN 211553847U CN 201922388219 U CN201922388219 U CN 201922388219U CN 211553847 U CN211553847 U CN 211553847U
- Authority
- CN
- China
- Prior art keywords
- resistor
- gas sensor
- sensing device
- shaping circuit
- refrigerator
- 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.)
- Expired - Fee Related
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 206010034018 Parosmia Diseases 0.000 title claims abstract description 8
- 238000007493 shaping process Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 10
- 235000019645 odor Nutrition 0.000 claims 2
- 238000004088 simulation Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 25
- 230000035943 smell Effects 0.000 description 10
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 6
- 235000013305 food Nutrition 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 231100000167 toxic agent Toxicity 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- 206010002091 Anaesthesia Diseases 0.000 description 1
- 206010019233 Headaches Diseases 0.000 description 1
- 206010028813 Nausea Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 206010000210 abortion Diseases 0.000 description 1
- 231100000176 abortion Toxicity 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000037005 anaesthesia Effects 0.000 description 1
- 238000001949 anaesthesia Methods 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 208000032839 leukemia Diseases 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- BAVYZALUXZFZLV-UHFFFAOYSA-N mono-methylamine Natural products NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 1
- 230000008693 nausea Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
- 108700012359 toxins Proteins 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model provides a non-contact monitoring refrigerator peculiar smell changes's sensing device, including at least one gas sensor, at least one shaping circuit, AD converter and output circuit, every gas sensor is connected to the AD converter after establishing ties with a shaping circuit, sends for output circuit after being converted into digital signal with the voltage signal of simulation by the AD converter. The output circuit is used for outputting the final monitored smell data. The utility model discloses can detect multiple smell simultaneously, correct gas sensor's output value, reduce because temperature reason influences sensing device monitoring precision.
Description
Technical Field
The utility model relates to a smell detection area, in particular to non-contact monitoring refrigerator peculiar smell changes sensing device.
Background
With the improvement of the living standard of modern people, the refrigerator becomes one of the necessary household appliances for people in daily life, vegetables, fruits and meat foods can be stored in the refrigerator, and the foods can be stored for too long time and are not fresh, so that peculiar smell can be generated, and the peculiar smell can pollute the air quality in the refrigerator. The main components of these off-flavours are methyl mercaptan and amine gases, which, when inhaled, can cause headache, nausea and various degrees of anaesthesia.
According to the research, methyl mercaptan produced from spoiled foods produces toxins and is carcinogenic. Prolonged exposure can lead to leukemia, greatly increasing the risk of cancer, and can also lead to abortion in pregnant women. Methyl mercaptan is a toxic substance that affects the kidneys and liver of humans, and worse yet, it is extremely difficult for the human body to expel the toxic substance.
At present, some sensors for detecting refrigerator smell are available, and the detection precision is not very high due to the influence of temperature factors.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve prior art's problem, the utility model provides a non-contact monitoring refrigerator peculiar smell changes's sensing device, including first photosensitive sensor, shaping circuit, AD converter and the output circuit who connects gradually, its characterized in that: the shaping circuit comprises a thermistor, a first resistor, a second resistor and a capacitor; the two ends of the capacitor are used as the input end of the shaping circuit and connected with the output end of the gas sensor, and one end of the thermistor is connected with one end of the capacitor and one end of the second resistor and grounded; the other end of the thermistor is connected with the other end of the second resistor and one end of the first resistor, and the other end of the first resistor is connected with the other end of the capacitor and is used as the output end of the shaping circuit to be connected with the A/D converter.
Furthermore, the gas sensor device also comprises more than one gas sensor and more than one shaping circuit, wherein each gas sensor is connected with one shaping circuit in series and then is connected to the A/D converter.
Further, the thermistor is a negative temperature coefficient thermistor.
The utility model discloses can detect multiple smell simultaneously, correct gas sensor's output value, reduce because temperature reason influences sensing device monitoring precision. The utility model discloses a sensing device that non-contact monitoring refrigerator peculiar smell changes, low power dissipation, to food peculiar smell have high sensitivity, long service life, with low costs, application circuit simple.
Drawings
Fig. 1 is a circuit block diagram of a non-contact type sensing device for monitoring the odor change of a refrigerator according to a first embodiment of the present invention;
fig. 2 is a circuit block diagram of a non-contact type sensing device for monitoring the odor change of a refrigerator according to a second embodiment of the present invention;
fig. 3 is a schematic circuit diagram of the shaping circuit of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
The utility model discloses a non-contact monitoring refrigerator peculiar smell changes's sensing device, including gas sensor, shaping circuit, AD converter and output circuit.
The wave velocity and frequency of the surface of the acoustic wave device can drift along with the change of the external environment. The gas sensor is characterized in that a layer of gas-sensitive film which selectively adsorbs a certain gas is coated on the surface of a piezoelectric crystal by utilizing the performance, and when the gas-sensitive film interacts with the gas to be detected (chemical action, biological action or physical adsorption), the film quality and the conductivity of the gas-sensitive film change, so that the acoustic surface wave frequency of the piezoelectric crystal drifts; the gas concentration is different, and the quality of the film layer and the change degree of the conductivity are also different, namely, the change of the acoustic surface wave frequency is also different. By measuring the change of the frequency of the surface acoustic wave, an accurate change value of the concentration of the reaction gas can be obtained. The change in conductivity is ultimately converted to a voltage signal output corresponding to the gas concentration. This is the working principle of the gas sensor.
The shaping circuit comprises a thermistor RV, a first resistor R1, a second resistor R2 and a capacitor C1; two ends of the capacitor C1 are used as the input end of the shaping circuit and connected with the output end of the gas sensor, and one end of the RV is connected with one end of the capacitor C1 and one end of the second resistor R2 and grounded; the other end of the thermistor RV is connected with the other end of the second resistor R2 and one end of the first resistor R1, and the other end of the first resistor R1 is connected with the other end of the capacitor C1 and is connected with an A/D converter as an output end of the shaping circuit.
The thermistor RV is a negative temperature coefficient thermistor. The function of the capacitor C1 is filtering. In a specific embodiment, the first resistor R2 has a resistance of 2.7k ohms, and the second resistor R3 has a resistance of 39k ohms. The negative temperature coefficient thermistor is of the type SEMITEC 103 AT-2. Of course, the model and related parameters of each component in the circuit can be adjusted accordingly according to the actual use situation, which can be done by those skilled in the art.
When the electric machine works, the heat-sensitive sensor heats itself, and the equivalent resistance value is reduced along with the rise of the temperature. In order to reduce the influence of temperature on the output voltage of the gas sensor, a negative temperature coefficient thermistor is added, and the negative temperature coefficient thermistor is reduced along with the temperature rise. Under the condition that other conditions are not changed, the equivalent resistance is reduced along with the temperature rise, and the thermistor VR is also reduced along with the temperature rise, so that the influence of the temperature on the output voltage of the gas sensor is counteracted. The output voltage of the gas sensor ranges from 1.26V to 1.37V within the temperature range of 10 ℃ to 45 ℃. From this it can be concluded that: by using the circuit compensated by the negative temperature coefficient thermistor, the output voltage of the gas sensor can be stabilized to about 1.3V effectively within a certain range (10-45 ℃), so that the temperature characteristic of the gas sensor is improved, and the output voltage of the gas sensor is stabilized.
The a/D converter employs a device in the related art that can convert an analog voltage signal into a digital signal.
The output circuit is used for outputting the final monitored smell data.
Example two
The utility model discloses an embodiment one can only monitor single smell, on embodiment one's basis, increases a plurality of gas sensor, and every gas sensor monitors different smells, can realize the monitoring to different smells. A shaping circuit is connected in series behind each sensor. The working principle is the same as that of the first embodiment, and is not described herein again.
The above description is for illustrative purposes only and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. that do not depart from the spirit and principles of the present invention should be construed as within the scope of the present invention.
Claims (3)
1. Non-contact monitoring refrigerator peculiar smell changes's sensing device, including first photosensitive sensor, shaping circuit, AD converter and the output circuit who connects gradually, its characterized in that: the shaping circuit comprises a thermistor, a first resistor, a second resistor and a capacitor; the two ends of the capacitor are used as the input end of the shaping circuit and connected with the output end of the gas sensor, and one end of the thermistor is connected with one end of the capacitor and one end of the second resistor and grounded; the other end of the thermistor is connected with the other end of the second resistor and one end of the first resistor, and the other end of the first resistor is connected with the other end of the capacitor and is used as the output end of the shaping circuit to be connected with the A/D converter.
2. The apparatus of claim 1, wherein the sensor is configured to monitor changes in refrigerator odors in a non-contact manner, and wherein: the gas sensor and the shaping circuit are connected in series and then connected to the A/D converter.
3. A non-contact sensor for monitoring the odor change of a refrigerator according to claim 1 or 2, wherein: the thermistor is a negative temperature coefficient thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922388219.4U CN211553847U (en) | 2019-12-27 | 2019-12-27 | Non-contact type sensing device for monitoring peculiar smell change of refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922388219.4U CN211553847U (en) | 2019-12-27 | 2019-12-27 | Non-contact type sensing device for monitoring peculiar smell change of refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211553847U true CN211553847U (en) | 2020-09-22 |
Family
ID=72509999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922388219.4U Expired - Fee Related CN211553847U (en) | 2019-12-27 | 2019-12-27 | Non-contact type sensing device for monitoring peculiar smell change of refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211553847U (en) |
-
2019
- 2019-12-27 CN CN201922388219.4U patent/CN211553847U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2012170702A5 (en) | ||
| EP4223217A3 (en) | Vital signs monitoring system | |
| CN104501986A (en) | High-precision wide-range temperature measurement system | |
| CN109781797A (en) | TVOC gas sensing devices, air processor | |
| TW200643427A (en) | Apparatus for current sensing | |
| WO2011025048A8 (en) | Sensor device | |
| CN201166903Y (en) | System for monitoring an environment in a vehicle | |
| CN105181544A (en) | Detection device and detection method for concentration of particulate matter in air | |
| TW200733656A (en) | Filter equalization using magnitude measurement data | |
| CN114729873A (en) | Systems and methods for chemical detection and amplification | |
| HRP20231459T1 (en) | Diagnostic apparatus and diagnostic method for measurements on saliva | |
| EP2169374A3 (en) | Resistive pressure detection apparatus | |
| CN211553847U (en) | Non-contact type sensing device for monitoring peculiar smell change of refrigerator | |
| EP2469368A3 (en) | Method and system for determining a component's resistance to flow | |
| JP2006220629A (en) | Internal impedance measuring device for storage battery, and internal impedance measuring method of the storage battery | |
| ATE312549T1 (en) | CORRECTION OF BLOOD PRESSURE MEASUREMENTS IN INVASIVE LIQUID-FILLED SYSTEMS | |
| JP2012042399A (en) | Detecting method and detecting device for tvoc, and outside air intake control system | |
| WO2020146248A3 (en) | Biometric detection using multiple sensors | |
| CN203133019U (en) | Interference compensation device of electrochemical gas sensor | |
| JP2014516162A (en) | Fluid flow detection method by ultrasonic propagation time method | |
| JP6388113B2 (en) | Sensor circuit | |
| CN107764889B (en) | Gas-solid two-phase flow dust carbon content measuring method based on signal energy method | |
| US20160003757A1 (en) | Gas measurement device and measurement method thereof | |
| Naepelt et al. | An Indoor Air Quality System for IoT applications | |
| CN212410496U (en) | Anti-virus wearable device capable of alarming |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200922 |