CN207851101U - NTC detection circuits and wind speed measuring sensor for wind speed measurement - Google Patents
NTC detection circuits and wind speed measuring sensor for wind speed measurement Download PDFInfo
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- CN207851101U CN207851101U CN201721811677.9U CN201721811677U CN207851101U CN 207851101 U CN207851101 U CN 207851101U CN 201721811677 U CN201721811677 U CN 201721811677U CN 207851101 U CN207851101 U CN 207851101U
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Abstract
The utility model provides a kind of NTC detection circuits and wind speed measuring sensor for wind speed measurement, and the NTC detection circuits include：Bridge circuit, including the first bridge arm and the second bridge arm in parallel；Wherein, the first bridge arm is in series with NTC resistance；Amplify feedback circuit, first input end and the second input terminal are connected with first bridge arm of bridge circuit and the second bridge arm, are compared and amplify for the voltage to the first bridge arm and second bridge arm respectively；Adjust circuit, it is connected respectively with bridge circuit and amplification feedback circuit, when unequal for the voltage in the first bridge arm and the second bridge arm, pressurize to the first bridge arm so that NTC resistance resistance value constantly variation until the first bridge arm and the second bridge arm the equal formation constant-temperature circuit of voltage, for control element pass through acquire the first bridge arm and the second bridge arm voltage it is equal when bridge circuit output voltage obtain corresponding wind speed.The temperature substantially constant of the utility model probe, effectively applies NTC resistance measurement wind speed.
Description
Technical field
The utility model is related to field of measuring technique, and more particularly to measuring wind speed technical field, specially one kind is used for
The NTC detection circuits of wind speed measurement and a kind of wind speed measuring sensor.
Background technology
Laboratory ventilation is an indispensable component part in lab design.In order to make laboratory worker not
Suck or swallow should have in the chemical substance and organism, laboratory that some are toxic, can causing a disease or toxicity is unknown it is good
Ventilation.To prevent the absorption of some steams, gas and particle (smog, coal smoke, dust and aerosol), polluter that from must using ventilation
Cabinet, ventilator cowling or the method for local ventilation remove.Vent cabinet is that a kind of most common intermittent local ventilation, type are numerous in laboratory
More, due to its structure difference, the condition used is different, and exhaust effect also differs.
Laboratory hood main function is to inhibit the harmfulness chemical gas generated in cabinet to prevent its leakage, and as early as possible will
It excludes laboratory, ensures the safety of laboratory employee.Turbulent flow should not occur into the gas in vent cabinet and vent cabinet；It is logical
The import wind speed of wind cabinet should be maintained at a suitable range (usual 0.3-0.5m/s).Industrial ventilation-U.S. government's industry is defended
Raw expert association (ACGIH)-is P.10-40.
The mounting means of face wind speed is then to move with pipeline the side wall of vent cabinet in one hole of side opening of vent cabinet
On, the wind speed of face wind speed is smaller than wind speed under window, is in general all to be linear, this relationship is by each vent cabinet pattern, trepanning
Size, pipeline codetermine.So being highly suitable for the detection of this gentle breeze speed as the wind speed measurement mode of heat-sensitive type.
NTC (Negative Temperature Coefficient), Chinese are " negative tempperature coefficient thermistor ".From
After 1960 develop NTC themistor, NTC is grown rapidly.General market specially on NTC for detecting wind speed
Probe is all to do more frivolous, and large contact area with air, rate of heat exchange is fast, thus for wind speed response quickly, can
To accomplish a millisecond rank, but in the use of face wind speed, response speed that need not be so high.And this dedicated probe
It also is difficult to carry out consistency, the duplication not being able to batch, it is desired nonetheless to artificial calibration, and cost is higher, is not having maturation also
China laboratory market be difficult promote.
On the other hand common NTC is that the glass tube of diode-type encapsulates, and all has higher resistance value essence on the market
Degree, larger operating temperature range, and it is corrosion-resistant ageing-resistant.The disadvantage is that common NTC dissipation factors are bigger than normal, causing can not be right
Wind speed accomplishes the other response of Millisecond, but cost is relatively low, is conducive to promote.Environment temperature can impact hot type anemobiagraph,
In general all it is using hardware compensating method, advantage is once it is determined that getting off, and processing is simple, the disadvantage is that relying on very much hard
Part.
A kind of design method of thermostatic type airspeedometer in the prior art, comes from《Portable thermosensitive resistance constant temperature airspeedometer》It is old
Gram bright work, the schematic diagram used in the design method is as shown in Figure 1, according to the circuit diagram：
Rt in formula：The resistance value of thermistor when temperature is t；t、t1：Respectively probe operating temperature and gas flow temperature； i
=R2/R3=Rt/R4f (v)=A+Bvn；Rt//Ra=Rt*Ra/ (Rt+Ra)；In his paper, hardware benefit has finally been taken
It repays, that is, finds Rt satisfactions：
The advantages of above-mentioned technical proposal is operating temperature, wind-warm syndrome variation range of the precision of this compensation method only by popping one's head in
And the temperature characterisitic of compensation component determines, and the temperature characterisitic of probe is unrelated.So the probe for different characteristics all may be used
With in this way.There is versatility and flexibility in this way, convenient for the exchange of experiment probe.The disadvantage is that this is compensated
The temperature characterisitic of NTC Rt is unsatisfactory for generality, needs to customize making, of high cost, hardly possible is realized.
Although but being not a kind of linear relationship, the environment medium temperature in laboratory in above-mentioned technical proposal U and T
Degree does not generally all exceed 10-30 DEG C of this range.By in theoretical calculation by changing this i value, so that it may to find out required
In the wind speed and temperature range wanted, U and T are at close to linear relationship.
Utility model content
In view of the foregoing deficiencies of prior art, the purpose of this utility model is to provide a kind of for wind speed measurement
NTC detection circuits and a kind of wind speed measuring sensor can not effectively apply NTC resistance measurement wind in the prior art for solving
The problem of speed.
In order to achieve the above objects and other related objects, the utility model provides a kind of NTC detections for wind speed measurement
Circuit, the NTC detection circuits for wind speed measurement include：Bridge circuit, including the first bridge arm and the second bridge arm in parallel；Its
In, first bridge arm is in series with NTC resistance；Amplify feedback circuit, first input end and the second input terminal respectively with the bridge
First bridge arm of circuit is connected with second bridge arm, for the voltage of first bridge arm and second bridge arm into
Row compares and amplification；Circuit is adjusted, is connected respectively with the bridge circuit and the amplification feedback circuit, in first bridge
When the voltage of arm and second bridge arm is unequal, pressurizeed to first bridge arm so that the resistance value of the NTC resistance constantly becomes
Change the equal formation constant-temperature circuit of voltage until first bridge arm and second bridge arm, so that control element is by acquiring institute
State the first bridge arm and second bridge arm voltage it is equal when the bridge circuit output voltage obtain corresponding wind speed.
In an embodiment of the utility model, one end of first bridge arm and second bridge arm is formed with voltage and adopts
Collect end, for being connected with the control element.
In an embodiment of the utility model, first bridge arm includes concatenated first resistor and the NTC resistance；
Second bridge arm includes concatenated second resistance and 3rd resistor.
In an embodiment of the utility model, first bridge arm and second bridge arm are connected separately with filtered electrical
Hold.
In an embodiment of the utility model, the amplification feedback circuit includes a comparison amplifier.
In an embodiment of the utility model, the adjusting circuit includes：Switching circuit, one end and first bridge arm
It is connected, the other end is connected with the output pin of the comparison amplifier, when the output pin of the comparison amplifier has pressure difference
It opens, when no pressure difference closes；External power supply is connected with the switching circuit, for when the switching circuit is opened, to described
First bridge arm pressurizes.
In an embodiment of the utility model, the switching circuit includes a transistor.
In an embodiment of the utility model, the adjusting circuit further includes being connected to the external power supply and described
Biasing resistor between one bridge arm.
In an embodiment of the utility model, the NTC detection circuits for wind speed measurement further include：Outside described
It connects power supply to be connected, the ambient temperature detection circuit for detecting environment temperature.
The utility model also provides a kind of wind speed measuring sensor, and the wind speed measuring sensor includes as described above uses
In the NTC detection circuits of wind speed measurement.
As described above, a kind of of the utility model senses for the NTC detection circuits of wind speed measurement and a kind of measuring wind speed
Device has the advantages that：
1, the utility model has preferable frequency response, because in constant-temperature circuit with compared with thermal sensor to wind speed
In, the temperature substantially constant of probe, rather than for change temperature state, and thermostatic type will not be due to probe caused by hot and cold alternation
NTC resistance measurement wind speed is effectively applied in damage.
2, the utility model is compared with the probe of profession, and professional probe is very thin to be easily damaged, and installation difficulty is big, and coating is too
Thin also to easily corrode, it is reliable and at low cost that the utility model has the advantages of convenient installation, easy mass.
3, the utility model is compared with hardware compensating, it is easier to it realizes, it is relatively more flexible, and it is at low cost, it is not necessarily to any customization
Device, and can effectively reduce due to temperature drift situation caused by the consistency of hardware.
Description of the drawings
Fig. 1 is shown as a kind of principle schematic of NTC detection circuits for wind speed measurement in the prior art.
Fig. 2 is shown as a kind of principle schematic of NTC detection circuits for wind speed measurement of the utility model.
Fig. 3 is shown as a kind of circuit diagram of NTC detection circuits for wind speed measurement of the utility model.
Fig. 4 be shown as in a kind of NTC detection circuits for wind speed measurement of the utility model under 0 wind speed detect voltage with
Relational graph between temperature.
Component label instructions
100 are used for the NTC detection circuits of wind speed measurement
110 bridge circuits
120 amplification feedback circuits
130 adjust circuit
140 ambient temperature detection circuits
Specific implementation mode
Illustrate that the embodiment of the utility model, those skilled in the art can be by this theorys below by way of specific specific example
Content disclosed by bright book understands other advantages and effect of the utility model easily.The utility model can also be by addition
Different specific implementation modes are embodied or practiced, and the various details in this specification can also be based on different viewpoints and answer
With carrying out various modifications or alterations under the spirit without departing from the utility model.It should be noted that the case where not conflicting
Under, the feature in following embodiment and embodiment can be combined with each other.
It should be noted that as shown in Figures 1 to 4, the diagram provided in following embodiment only illustrates in a schematic way
The basic conception of the utility model, when only display is with related component in the utility model rather than according to actual implementation in schema then
Component count, shape and size draw, when actual implementation kenel, quantity and the ratio of each component can be a kind of random change
Become, and its assembly layout kenel may also be increasingly complex.
The purpose of the present embodiment is that a kind of wind speed measurement circuit and a kind of wind speed measuring sensor are provided, it is existing for solving
There is the problem of NTC resistance measurement wind speed can not be effectively applied in technology.A kind of wind speed of the present embodiment described in detail below is examined
The principle and embodiment of slowdown monitoring circuit and a kind of wind speed measuring sensor, make those skilled in the art not need creative work i.e.
It is appreciated that a kind of wind speed measurement circuit of the present embodiment and a kind of wind speed measuring sensor.
In the technical solution of background technology, U and T is not a kind of linear relationship, but in the environment medium temperature in laboratory
Degree does not generally all exceed 10-30 DEG C of this range.By in theoretical calculation by changing this i value, so that it may to find out required
In the wind speed and temperature range wanted, for U and T at close to linear relationship, physical circuit principle is as shown in Figure 2.Bridge circuit is kept
It is constant, it is connected on the temperature of measuring environment in constant voltage circuit using the R5 of NTC Rt1 and fixed resistance value, temperature in real time is calculated by mcu
Degree comes to influence caused by compensation temperature in the form of software.
Specifically, as shown in Figure 1, the present embodiment provides a kind of NTC detection circuits 100 for wind speed measurement, the use
Include in the NTC detection circuits 100 of wind speed measurement：Bridge circuit 110, amplification feedback circuit 120 and adjusting circuit 130.
In this present embodiment, the bridge circuit 110 includes the first bridge arm and the second bridge arm in parallel；Wherein, described first
Bridge arm is in series with NTC resistance R11.Wherein, NTC resistance R11 is used by amplifying feedback circuit 120 and adjusting 130 self-heating of circuit
In the detection of wind speed.
Specifically, in this present embodiment, first bridge arm includes concatenated first resistor R7 and the NTC resistance R11；
Second bridge arm includes concatenated second resistance R8 and 3rd resistor R19.First resistor R7, NTC resistance R11, second resistance
R8 and 3rd resistor R19 forms a bridge circuit 110, and in-between voltage is compared and opens by amplifying feedback circuit 120
Ring amplifies.
Wherein, in this present embodiment, first bridge arm and second bridge arm are connected separately with filter capacitor：Described
One bridge arm is connected with the first filter capacitor C8, and second bridge arm is connected with the second filter capacitor C7.Due to NTC resistance R11 materials
The reason of matter, the R11 fevers of NTC resistance can be uneven, so when change in resistance, the voltage of voltage acquisition end VAV has concussion,
So the effect of the first filter capacitor C8 and the second filter capacitor C7 is exactly to improve the flatness of output.
In this present embodiment, one end of first bridge arm and second bridge arm is formed with voltage acquisition end (institute in Fig. 3
The VAV shown), directly it is connected with the control element (such as microcontroller) after can simply dividing.
In this present embodiment, it is described amplification feedback circuit 120 first input end and the second input terminal respectively with the bridge
First bridge arm of circuit 110 is connected with second bridge arm, for the electricity to first bridge arm and second bridge arm
Pressure is compared and amplifies.
Specifically, in this present embodiment, the amplification feedback circuit 120 includes a comparison amplifier U1.
As shown in figure 3, the in-phase input end (pin 3 shown in Fig. 3 be 1-IN+) of the comparison amplifier U1 with it is described
First bridge arm is connected, and inverting input (pin 2 shown in Fig. 3 is 1-IN-) is connected with second bridge arm, and ideal op is put
Big device thinks that Open loop gain cofficient is very high, is approximately considered as infinity, once so in-phase input end (figure of comparison amplifier U1
Pin 3 shown in 3 is 1-IN+) and reverse input end (pin 2 shown in Fig. 3 i.e. 1-IN-) voltage have pressure difference i.e. 2 feet and 3
There is voltage difference on foot, then voltage is had on output end (pin 1 shown in Fig. 3 is 1-OUT), by the Voltage Feedback to the tune
Economize on electricity road 130.
In this present embodiment, the adjusting circuit 130 respectively with the bridge circuit 110 and the amplification feedback circuit 120
It is connected, for when the voltage of first bridge arm and second bridge arm is unequal, being pressurizeed to first bridge arm so that institute
The resistance value constantly variation of NTC resistance R11 is stated until the equal formation constant temperature electricity of the voltage of first bridge arm and second bridge arm
Road, so that control element passes through the voltage for acquiring first bridge arm and second bridge arm bridge circuit 110 when equal
Output voltage obtains corresponding wind speed.
Specifically, in this present embodiment, the adjusting circuit 130 includes：Switching circuit, external power supply and biasing resistor.
Described switching circuit one end is connected with first bridge arm, the output pin of the other end and the comparison amplifier U1
(pin 1 shown in Fig. 3 is 1-OUT) is connected, and is opened when the output pin of the comparison amplifier U1 has pressure difference, no pressure
It is closed when poor.
Specifically, in this present embodiment, the switching circuit includes a transistor Q1.
Wherein, in this present embodiment, the base stage of the transistor Q1 connects the output pin of the comparison amplifier U1, institute
The emitting stage for stating transistor Q1 is connected on voltage acquisition end (VAV shown in Fig. 3) conducting wire, and collector connects the external electricity
Source.Current-limiting resistance R9 can be connected on circuit between the base stage of the transistor Q1 and the pin of the comparison amplifier U1.
I.e. the in-phase input end of comparison amplifier U1 (1-IN+ shown in Fig. 3) and reverse input end are (shown in Fig. 3
Pin 2 is 1-IN-) voltage has on pressure difference i.e. 2 feet and 3 feet and has voltage difference, then have electricity on output end (i.e. pin 1 in Fig. 3)
Pressure, at this point, transistor Q1 ground levels when there is control source are connected with emitter, i.e. transistor Q1 is opened.
In this present embodiment, the biasing resistor R46 is connected between the external power supply and first bridge arm.It is described
Biasing resistor R46 can give the in-phase input end (1-IN+ shown in Fig. 3) (i.e. 3 pins) one of the comparison amplifier U1
The bias voltage of starting keeps electrification circuit normal work.
The external power supply is connected with the feeder ear pin VCC of the switching circuit, the comparison amplifier U1, is used for
It pressurizes to first bridge arm when switching circuit is opened.Wherein, the external power supply is, for example, 12V, 24V etc..
When the ground level of transistor Q1 is connected with emitter, the external power supply voltage, such as 12V can subtract emitter with
Pressure drop direct weighting between collector is to voltage acquisition end (at VAV).
When voltage increases at VAV, the R11 fevers of NTC resistance increase, and resistance value reduces, to reduce in comparison amplifier U1
In-phase input end (1-IN+ shown in Fig. 3) (3 pin) voltage.Then the comparison amplifier U1 continues to compare homophase input
The voltage of (1-IN+ shown in Fig. 3) between reverse input end is held to pass through transistor Q1 and external electricity once there is pressure difference
Source is pressurizeed to bridge circuit 110, changes in-phase input end (1-IN+ shown in Fig. 3) (3 in NTC resistance R11, comparison amplifier U1
Pin) voltage, until the in-phase input end (1-IN+ shown in Fig. 3) and reverse input end voltage of comparison amplifier U1 have pressure
Difference is that no-voltage is poor on 2 feet and 3 feet, finally balances, forms constant-temperature circuit.
Under equilibrium state, it is inevitable have NTC resistance R11 and first resistor R7 and ratio be equal to 3rd resistor R19 and the
The ratio of two resistance R8, i.e. R11/R7=R19/R8.
In this present embodiment, the ratio of the 3rd resistor R19 and second resistance R8 is not more than five, preferably 2, i.e.,
Such as the second resistance R8 is 7.5K Ω, the second resistance R8 is first described in the initial resistance value ratio of 15K Ω, the NTC
Resistance R7 is big, and the resistance value of the NTC resistance R11 is for example selected as 1K, and the first resistor R7 is for example selected as 100 Ω, then by institute
NTC resistance R11 is stated in adjustment process, resistance value can constantly reduce, described when the resistance value of the first resistor R7 is 100 Ω
The resistance value of NTC resistance R11 balances when being 200 ohm.
So the final resistance values of NTC resistance R11 are 200 Ω here, control resistance value table temperature can't surpass at 80 DEG C or so
Cross use scope.Voltage stabilization at VAV can be directly connected to by simply dividing on the pin of microcontroller, by microcontroller according to
Output voltage obtains corresponding wind speed.
In this present embodiment, the NTC detection circuits 100 for wind speed measurement further include：With the external power supply phase
Even, the ambient temperature detection circuit 140 for detecting environment temperature.As shown in figure 3, the ambient temperature detection circuit 140 wraps
Include also can be connected to the external power supply including NTC resistance a R26, the NTC resistance R26 by a divider resistance R25
(12V), wherein a thyristor for circuit protection can be connected between the NTC resistance R26 and the divider resistance R25,
The NTC resistance R26 can be with one protective resistance R12 of parallel connection.
The present embodiment also provides a kind of wind speed measuring sensor, and the wind speed measuring sensor includes being used for as described above
The NTC detection circuits 100 of wind speed measurement.It is above-mentioned that the NTC detection circuits 100 for wind speed measurement have been carried out specifically
Bright, details are not described herein.
Since the characteristic curve that the resistance value of NTC resistance R11 varies with temperature is nonlinear change, and different ventilations
Actual wind speed is different under its face wind speed of cabinet and window, and field adjustable personnel is needed to demarcate.And voltage caused by temperature
Drift is calculated by formula, can theoretically find an i value, and within 0-35 DEG C, the pressure difference variation of temperature and sampled point is into
Ratio, by multigroup experimental data, the curve graph of voltage at different temperature at VAV can be obtained under 0 wind speed.Fig. 4
For under 0 wind speed, the relational graph between VAV voltages and temperature.At different temperature, the growth of voltage is with one to same wind speed
A linear relationship, that is, scatter plot slope K value.K is averaged 0.0749 by many experiments.Commissioning staff at the scene will
After the relationship of wind speed and voltage has demarcated value, the voltage value after increase/reduction is substituted into the calculating of wind speed by the way that K values are added,
It can obtain actual wind speed.
In conclusion the utility model has preferable frequency response, because in perseverance with compared with thermal sensor to wind speed
In circuit temperature, the temperature substantially constant of probe, rather than for change temperature state, and thermostatic type will not be caused due to hot and cold alternation
The damage of probe；The utility model is compared with the probe of profession, and professional probe is very thin to be easily damaged, and installation difficulty is big, coating
Too thin also to easily corrode, it is reliable and at low cost that the utility model has the advantages of convenient installation, easy mass；The utility model and hardware compensating phase
Than, it is easier to it realizes, it is relatively flexible, it is at low cost, it is not necessarily to any customization device, and can effectively reduce consistent due to hardware
Temperature drift situation caused by property.So the utility model effectively overcomes various shortcoming in the prior art and has height and produce
Industry utility value.
The above embodiments are only illustrative of the principle and efficacy of the utility model, new not for this practicality is limited
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
All equivalent modifications completed under refreshing and technological thought or change, should be covered by the claim of the utility model.
Claims (10)
1. a kind of NTC detection circuits for wind speed measurement, which is characterized in that the NTC detection circuits for wind speed measurement
Including：
Bridge circuit, including the first bridge arm and the second bridge arm in parallel；Wherein, first bridge arm is in series with NTC resistance；
Amplify feedback circuit, first input end and the second input terminal respectively with first bridge arm of the bridge circuit and described the
Two bridge arms are connected, and are compared and amplify for the voltage to first bridge arm and second bridge arm；
Circuit is adjusted, is connected respectively with the bridge circuit and the amplification feedback circuit, is used in first bridge arm and described
When the voltage of second bridge arm is unequal, pressurizeed to first bridge arm so that the resistance value constantly variation of the NTC resistance is until institute
The equal formation constant-temperature circuit of voltage for stating the first bridge arm and second bridge arm, so that control element is by acquiring first bridge
The output voltage of the voltage of arm and second bridge arm bridge circuit when equal obtains corresponding wind speed.
2. the NTC detection circuits according to claim 1 for wind speed measurement, which is characterized in that first bridge arm and
One end of second bridge arm is formed with voltage acquisition end, for being connected with the control element.
3. the NTC detection circuits according to claim 1 for wind speed measurement, which is characterized in that the first bridge arm packet
Include concatenated first resistor and the NTC resistance；Second bridge arm includes concatenated second resistance and 3rd resistor.
4. the NTC detection circuits according to claim 1 or 3 for wind speed measurement, which is characterized in that first bridge arm
It is connected separately with filter capacitor with second bridge arm.
5. the NTC detection circuits according to claim 1 for wind speed measurement, which is characterized in that the amplification feedback electricity
Road includes a comparison amplifier.
6. the NTC detection circuits according to claim 5 for wind speed measurement, which is characterized in that the adjusting circuit packet
It includes：
Switching circuit, one end are connected with first bridge arm, and the other end is connected with the output pin of the comparison amplifier, in institute
The output pin for stating comparison amplifier is opened when having pressure difference, and when no pressure difference closes；
External power supply is connected with the switching circuit, for when the switching circuit is opened, pressurizeing to first bridge arm.
7. the NTC detection circuits according to claim 6 for wind speed measurement, which is characterized in that the switching circuit packet
Include a transistor.
8. the NTC detection circuits according to claim 6 for wind speed measurement, which is characterized in that the adjusting circuit is also
Including the biasing resistor being connected between the external power supply and first bridge arm.
9. the NTC detection circuits according to claim 6 for wind speed measurement, which is characterized in that described to be examined for wind speed
The NTC detection circuits of survey further include：
It is connected with the external power supply, the ambient temperature detection circuit for detecting environment temperature.
10. a kind of wind speed measuring sensor, which is characterized in that the wind speed measuring sensor includes such as claim 1 to right
It is required that the NTC detection circuits for wind speed measurement described in 9 any claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721811677.9U CN207851101U (en) | 2017-12-22 | 2017-12-22 | NTC detection circuits and wind speed measuring sensor for wind speed measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721811677.9U CN207851101U (en) | 2017-12-22 | 2017-12-22 | NTC detection circuits and wind speed measuring sensor for wind speed measurement |
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| Publication Number | Publication Date |
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| CN207851101U true CN207851101U (en) | 2018-09-11 |
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ID=63422108
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| CN201721811677.9U Active CN207851101U (en) | 2017-12-22 | 2017-12-22 | NTC detection circuits and wind speed measuring sensor for wind speed measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959801A (en) * | 2017-12-22 | 2019-07-02 | 上海卓思智能科技股份有限公司 | NTC detection circuit and wind speed measuring sensor for wind speed measurement |
-
2017
- 2017-12-22 CN CN201721811677.9U patent/CN207851101U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959801A (en) * | 2017-12-22 | 2019-07-02 | 上海卓思智能科技股份有限公司 | NTC detection circuit and wind speed measuring sensor for wind speed measurement |
| CN109959801B (en) * | 2017-12-22 | 2023-09-19 | 上海卓思智能科技股份有限公司 | NTC detection circuit for wind speed detection and wind speed measurement sensor |
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