CN2596339Y - Plant foliage temperature sensing transmitter - Google Patents
Plant foliage temperature sensing transmitter Download PDFInfo
- Publication number
- CN2596339Y CN2596339Y CN 02257527 CN02257527U CN2596339Y CN 2596339 Y CN2596339 Y CN 2596339Y CN 02257527 CN02257527 CN 02257527 CN 02257527 U CN02257527 U CN 02257527U CN 2596339 Y CN2596339 Y CN 2596339Y
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- China
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- voltage
- temperature sensing
- transmitter
- pwm
- sensing transmitter
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Abstract
The utility model relates to a temperature sensing transmitter for plant foliage, which comprises a helical metal spring, a high-precision temperature sensor DS18B20, a plastic base, a connecting conducting wire and a transmitter which is connected with the conducting wire into a whole and is composed of a single-chip computer 87LPC768 and a current conversing circuit PWM. The utility model is used for measuring the temperature changing conditions of foliage of crops in agricultural greenhouses, field and farmland or trees and collecting information, and the resolution is 0.1 DEG C.
Description
Technical field
The utility model be used for the blade face temperature variations of the crops in agricultural greenhouse booth, field, field or trees is measured and have the temperature sensors of high precision of 4-20mA general-purpose simulation current signal interface, but long-distance transmissions.
Technical background
Measuring of blade face temperature to plant is a kind of more special temperature measurement application, is difficult to be competent at common temperature sensor and measuring method.This is because the blade of a lot of plants is little and soft, and the anchorage force of leaf stalk is limited, so just require the weight of temperature sensor must be very light; In addition, when measuring, should reduce the covering of sensor itself as far as possible, otherwise can influence the accuracy of measurement even the growth of plant itself is impacted the blade face; Having is exactly that this its degree of absorption to the sunshine heat under solar radiation of temperature sensor is the smaller the better again, the true temperature of measuring like this that is only plant leaf surface; Moreover, certain distance is arranged between test point and Displaying Meter in many cases, therefore must eliminate of the influence of this section line to measuring accuracy.At present, domestic also do not have custom-designedly to carry out measured sensor at the plant leaf surface temperature, and majority is thermal resistance PT100 or thermistor to be directly fixed on leaf surfaces measure, and measuring accuracy can not get ensureing.The company that abroad has adopts the noncontact method to carry out the blade face temperature survey, but price is very expensive, and is also not too convenient in the use.
Summary of the invention
The purpose of this utility model, be release a kind of easy to use, measure novel blade face temperature sensor accurate, cheap, that be easy to promote.Below be particular content of the present utility model:
Shown in figure one, temperature sensors of high precision DS18B20 chip (2) is fixed on the plastic feet (3), plastic feet is fixed in the first half in the spiral elastic ring (1), the soft lead-in wire of two cores (4) of sensing chip is drawn by plastic feet (3) upper end and is linked to each other with the transmitter of being made up of together with shell 87LPC768 single-chip microcomputer, pulse-length modulation output (PWM)-current converter circuit (5) again.With the two ends up and down that pull spiral elastic ring (1) it is drawn back during use, trip spring circle behind the circle ring that the insertion spiral elastic ring bottom, edge of blade to be measured is suitable, blade will be by natural clamping, and this moment, sensor also can closely contact with leaf surfaces.
Single-chip microcomputer reads in current temperature value by the soft lead-in wire (4) that links to each other with temperature sensors of high precision DS18B20 chip (2), after internal arithmetic, linearization, calibration, measurement result is exported in the mode of pulse-length modulation (PWM), again through PWM-〉current converter circuit with present application very widely 4-20mA current signal form export the measured value on current blade face.Architecture of the present utility model as shown in Figure 2.
Pulse-length modulation (PWM)-current signal translation circuit is made up of two parts, and as shown in Figure 3, left-half is the PWM-voltage conversion circuit among the figure, by U
1, R
1, R
2, R
3, C
1, C
2Form integration type filtering driving circuit, utilize the high input impedance of operational amplifier and strong driving force to be filtered into stable voltage signal from the pwm pulse signal that single-chip microcomputer comes.Right half part is the voltage-to-current translation circuit among the figure, by U
2Prime is passed through R
4Receive NPN type triode Q after the proportional decay of the voltage signal that transmits
1Base stage on, Q under the control of this base voltage
1At Vdd, R
8, W
1Form and the corresponding current signal of output voltage in the loop of forming, carefully adjust the parameter of each element and can export corresponding 4-20mA electric current during for 1-5V at input voltage.
This sensor is characterized as trifocal 9-30V power supply outward, and output signal is a three-wire system 4-20mA electric current, and resolution is 0.1 ℃.
The utility model has the advantages that:
1. sensor and transmitter split-type design are middlely linked by thin and soft wire, and be very easy to use.
2. the output of general 4-20mA signal, but long-distance transmissions, with most of test instrumentations and TT﹠C system can
Directly to link to each other.
3. measuring the resolution height, is 0.1 ℃, measuring accuracy can reach ± and 0.3 ℃.
4. utilize the intrinsic elasticity of turn that sensor is closely contacted with the blade face, can improve the accuracy of measurement.
5. simple in structure, cost is low, be fit to agricultural and use.
Description of drawings
Fig. 1 is an object construction synoptic diagram of the present utility model
Fig. 2 is a composition structural representation of the present utility model.
Fig. 3 is pulse-width modulation PWM of the present utility model-current signal conversion schematic diagram.
Embodiment
With the two ends up and down that pull spiral elastic ring 1 it is drawn back during use, trip spring circle behind the circle ring that the insertion spiral elastic ring bottom, edge of blade to be measured is suitable, blade will be by natural clamping, and this moment, sensor also can closely contact with leaf surfaces.This moment, single-chip microcomputer can read in current test value by the soft lead-in wire that links to each other with sensing chip automatically, after internal arithmetic, linearization, calibration, measurement result is exported in the mode of pulse-width modulation PWM, again through the PWM-current converter circuit with present application very widely 4-20mA current signal form export the measured value on current blade face.
Claims (2)
1, plant leaf surface temperature sensing transmitter, it is characterized in that temperature sensors of high precision DS18B20 chip (1) is fixed on the plastic feet (3), plastic feet is fixed in helical spring the first half, the lead-in wire of sensing chip (4) draw by plastic feet upper end and with the blade face temperature sensing transmitter of transmitter (5) being integral of forming together with shell by 87LPC768 single-chip microcomputer, pulse-length modulation output (PWM)-current converter circuit of mutual group.
2, plant leaf surface temperature sensing transmitter as claimed in claim 1 is characterized in that the PWM-voltage conversion circuit, by U
1, R
1, R
2, R
3, C
1, C
2Form integration type filtering driving circuit, utilize the high input impedance of operational amplifier and strong driving force to be filtered into stable voltage signal from the pwm pulse signal that single-chip microcomputer comes; The voltage-to-current translation circuit is by U
2Prime is passed through R
4Receive NPN type triode Q after the proportional decay of the voltage signal that transmits
1Base stage on, Q under the control of this base voltage
1At Vdd, R
8, W
1Form and the corresponding current signal of output voltage in the loop of forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02257527 CN2596339Y (en) | 2002-09-27 | 2002-09-27 | Plant foliage temperature sensing transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02257527 CN2596339Y (en) | 2002-09-27 | 2002-09-27 | Plant foliage temperature sensing transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2596339Y true CN2596339Y (en) | 2003-12-31 |
Family
ID=33725449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02257527 Expired - Fee Related CN2596339Y (en) | 2002-09-27 | 2002-09-27 | Plant foliage temperature sensing transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2596339Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932116A (en) * | 2017-03-06 | 2017-07-07 | 杭州朗宝万生物科技有限公司 | Blade face temperature detection sensor |
| CN108760084A (en) * | 2018-08-04 | 2018-11-06 | 乔斌 | A kind of fuel temperature sensor structure |
| CN108760085A (en) * | 2018-08-04 | 2018-11-06 | 乔斌 | Novel fuel temperature sensor |
-
2002
- 2002-09-27 CN CN 02257527 patent/CN2596339Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932116A (en) * | 2017-03-06 | 2017-07-07 | 杭州朗宝万生物科技有限公司 | Blade face temperature detection sensor |
| CN106932116B (en) * | 2017-03-06 | 2023-08-22 | 浙江托普云农科技股份有限公司 | Leaf surface temperature detection sensor |
| CN108760084A (en) * | 2018-08-04 | 2018-11-06 | 乔斌 | A kind of fuel temperature sensor structure |
| CN108760085A (en) * | 2018-08-04 | 2018-11-06 | 乔斌 | Novel fuel temperature sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |