CN102564634A - Measuring instrument for temperature of surface of plant leaf - Google Patents
Measuring instrument for temperature of surface of plant leaf Download PDFInfo
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- CN102564634A CN102564634A CN2012100528545A CN201210052854A CN102564634A CN 102564634 A CN102564634 A CN 102564634A CN 2012100528545 A CN2012100528545 A CN 2012100528545A CN 201210052854 A CN201210052854 A CN 201210052854A CN 102564634 A CN102564634 A CN 102564634A
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Abstract
The invention discloses a measuring instrument for the temperature of the surface of a plant leaf. The measuring instrument is characterized in that a Pt100 chip platinum resistance thermometer sensor is used as a sensor for measuring the temperature of the surface of the plant leaf, and simultaneously, the signal output end of the Pt100 chip platinum resistance thermometer sensor is connected with one end of a conditioning conversion circuit; the instrument adopts an MB95F204K Fujitsu single chip microcomputer as a control core of the circuit, and the MB95F204K Fujitsu single chip microcomputer is respectively in circuit connection with the voltage output end of the conditioning conversion circuit of the Pt100 chip platinum resistance thermometer sensor, a display screen and a key. The measuring instrument has the advantages that the temperature of the plant leaf can be simply and conveniently measured, the resolution is 0.3DEG C, and the change of the temperature of the plant leaf can be distinguished.
Description
Technical field
The present invention relates to a kind of measuring instrument, especially relate to a kind of plant leaf blade surface temperature measurement appearance.
Background technology
The temperature of plant leaf blade is the important physiological parameter of plant.The temperature of grasping plant leaf blade has important help for physiological activity states such as the transpiration rate of understanding plant, photosynthetic efficiencies.At present, the main mode of measuring for plant leaf temperature is the infrared measurement of temperature method, but because can't accurately the demarcating of the infrared emittance of plant leaf blade, institute self error just occurred so that measure measured.In addition and since the infrared measurement of temperature method for take measurement of an angle, the strict demand of environment, make in measuring the plant leaf temperature process to have a plurality of error sources, the uncertainty of last measurement data is big, the plant leaf temperature error that records at last is big.
At present, thermometry commonly used has platinum resistance thermometer sensor,, thermopair, infrared measurement of temperature method etc.Thermocouple temperature measurement is owing to exist cold junction compensation, so the measuring accuracy of thermopair is lower in low-temperature space is measured, and cost is higher relatively.There is certain defective in infrared measurement of temperature in the plant leaf temperature context of detection: 1) the blade emissivity confirms.2) influence of environment to measuring.Environment temperature, humidity, illumination etc. are the essential environmental factors that influences IR survey, and need before the IR survey environmental baseline is measured, and measure complicacy of early-stage preparations.Platinum resistance thermometer sensor, thermometric precision in the low-temperature space thermometric is high than thermocouple temperature measurement, and cost is lower, is fit to the plant leaf blade measurement requirement, and SMD RTD is measured leaf temperature can realize leaf temperature on the basis that does not influence the blade normal growth accurate measurement.
If Pt100 adopts two-wire system to connect, the RTD lead resistance will cause error to measurement result, and temperature is high more, and error is big more, and for eliminating the influence that the platinum sensor lead resistance causes measurement result, Pt100 adopts three-wire system to connect method.
Summary of the invention
The surveying instrument that the purpose of this invention is to provide a kind of plant leaf temperature; Select for use the Pt100 platinum resistance thermometer sensor, sensor that is fit to measure in the low temperature range that plant leaf temperature is gathered; Use monolithic integrated circuit to realize the conversion of sensor output signal, adopt the single-chip microcomputer treatment circuit to realize the processing of plant leaf temperature and the function of demonstration.
The technical scheme that the present invention adopts is:
Plant leaf blade surface temperature measurement appearance comprises the change-over circuit module, single-chip microcomputer and AD module, LCD MODULE, and key-press module.MB95F204K Fujitsu single-chip microcomputer respectively with Pt100 platinum resistance thermometer sensor, sensor signal change-over circuit module, LCD MODULE is connected with key-press module.The Pt100 platinum resistance thermometer sensor, becomes the temperature signal that records into resistance signal, and resistance signal becomes voltage signal through the change-over circuit module and inputs to single-chip microcomputer and AD module, output measurement result after single-chip microcomputer is handled, and on LCD MODULE, show.
Described modular converter comprises slot J1, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first chip U1.
1 pin of slot J1 looks like to be connected to power supply VCC with an end of first resistance R 1, an end of the 4th resistance R 4,7 pin of the first chip U1 respectively; 2 pin of J1 are connected with the other end of the 4th resistance R 4, an end of the 3rd resistance R 3,2 pin of the first chip U1 respectively; 1 pin of J1 is connected with 3 pin of an end first chip U1 of the other end of first resistance R 1, second resistance R 2 respectively, and the other end of the other end of second resistance R 2 and the 3rd resistance R 3 is connected to ground mutually; 1 pin of the first chip U1 is connected with an end of the 5th resistance R 5, and the other end of the 5th resistance R 5 is connected with 8 pin of the first chip U1; 4, the 5 pin ground connection of the first chip U1; Connect Pt100 platinum resistance thermometer sensor, sensor on the slot J1; The signal of the first chip U1 is the accurate instrumentation amplifier INA122 of Burr-Brown.
Described single-chip microcomputer and AD module comprise first capacitor C 41, second capacitor C 42, the 3rd capacitor C 5, the 4th capacitor C 6, the 5th capacitor C 74, the 6th resistance R 28, the 7th resistance R 16, crystal oscillator X1, the second chip U2.
First capacitor C, 41 1 termination VSS, the other end are connected with the end of crystal oscillator X1,4 pin of the second chip U2 respectively; Second capacitor C, 42 1 termination VSS, the other end are connected with the other end of crystal oscillator X1,5 pin of the second chip U2 respectively; The 3rd capacitor C 5 one termination VSS, 6 pin of another termination second chip U2; The 4th capacitor C 6 one termination power VSS, 7 pin of another termination second chip U2; The 6th resistance R 28 1 end ground connection VDD, the other end is connected with 8 pin of the second chip U2, an end of the 5th capacitor C 74 respectively, another termination VSS of the 5th capacitor C 74; 20 pin of the second chip U2 connect an end of the 7th resistance R 16, another termination VDD of the 7th resistance R 16; The model of the second chip U2 is MB95F204K.
LCD MODULE comprises the 3rd chip U3, four-core sheet U4.11 pin of 1 pin of the 3rd chip U3 and the second chip U2 join; 10 pin of 2 pin of the 3rd chip U3 and the second chip U2 join; 9 pin of 3 pin of the 3rd chip U3 and the second chip U2 join; 4 pin of the 3rd chip U3 meet VSS; 6 pin of the 3rd chip U3 and 1 pin of four-core sheet U4 join; 7 pin of the 3rd chip U3 and 3 pin of four-core sheet U4 join; 8 pin of the 3rd chip U3 and 2 pin of four-core sheet U4 join; 9 pin of the 3rd chip U3 and 4 pin of four-core sheet U4 join; 10 pin of the 3rd chip U3 and 9 pin of four-core sheet U4 join; 11 pin of the 3rd chip U3 and 10 pin of four-core sheet U4 join; 12 pin of the 3rd chip U3 and 11 pin of four-core sheet U4 join; 13 pin of the 3rd chip U3 and 12 pin of four-core sheet U4 join; 14 pin of the 3rd chip U3 and 13 pin of four-core sheet U4 join; 15 pin of the 3rd chip U3 and 14 pin of four-core sheet U4 join; 16 pin of the 3rd chip U3 and 15 pin of four-core sheet U4 join; 17 pin of the 3rd chip U3 and 16 pin of four-core sheet U4 join; 18 pin of the 3rd chip U3 and 5 pin of four-core sheet U4 join; 19 pin of the 3rd chip U3 and 6 pin of four-core sheet U4 join; 20 pin of the 3rd chip U3 and 7 pin of four-core sheet U4 join; 21 pin of the 3rd chip U3 and 8 pin of four-core sheet U4 join; The model of the 3rd chip U3 is BL55024; The model of four-core sheet U4 is TBP8900-LCD/A.
Described key-press module comprises the first pull-up resistor R41, the second pull-up resistor R42, the first button KEY1, the second button KEY2.
The first pull-up resistor R41, one termination VDD, the other end are connected the other end ground connection of the second button KEY2 with 2 pin of the second chip U2, the end of the second button KEY2 respectively; The second pull-up resistor R42, one termination VDD, the other end are connected the other end ground connection of the second button KEY1 with 1 pin of the second chip U2, the end of the second button KEY1 respectively.
Pt100 platinum resistance thermometer sensor, transducer probe assembly is clipped in tested blade surface; Make the heat transmission between Pt100 platinum resistance thermometer sensor, transducer probe assembly and the shading sleeve drop to minimum with polyfoam as heat-barrier material between Pt100 platinum resistance thermometer sensor, transducer probe assembly and the vanes fixed anchor clamps, Pt100 platinum resistance thermometer sensor, working sensor face is attached to tested blade surface and measures and gather.
The beneficial effect that the present invention has is:
Can be easy plant leaf temperature be measured, resolving power are 0.3 ℃, can tell the variation of plant leaf temperature.
Description of drawings
Fig. 1 is a plant leaf blade surface temperature measurement principle of instrument block diagram.
Fig. 2 is change-over circuit figure
Fig. 3 is single-chip microcomputer and AD circuit diagram.
Fig. 4 is the LCD MODULE circuit diagram.
Fig. 5 is the key-press module circuit diagram.
Fig. 6 is a plant leaf temperature measuring instrument Pt100 platinum resistance thermometer sensor, working sensor vertical view.
Among the figure: 1, Pt100 platinum resistance thermometer sensor, transducer probe assembly; 2, measured leaf.
Fig. 7 is a plant leaf temperature measuring instrument Pt100 platinum resistance thermometer sensor, working sensor front view.
Among the figure: 1, measured leaf surface; 2, Pt100 platinum resistance thermometer sensor, sensor; 3, Pt100 platinum resistance thermometer sensor, working sensor face; 4, foam plastic insulation; 5, Pt100 platinum resistance thermometer sensor, sensor signal lines; 6, vanes fixed anchor clamps.
Embodiment
As shown in Figure 1, plant leaf blade surface temperature measurement appearance comprises the change-over circuit module, single-chip microcomputer and AD module, LCD MODULE, and key-press module.MB95F204K Fujitsu single-chip microcomputer respectively with Pt100 platinum resistance thermometer sensor, sensor signal change-over circuit module, LCD MODULE is connected with key-press module.The Pt100 platinum resistance thermometer sensor, becomes the temperature signal that records into resistance signal, and resistance signal becomes voltage signal through the change-over circuit module and inputs to single-chip microcomputer and AD module, output measurement result after single-chip microcomputer is handled, and on LCD MODULE, show.
Modular converter as shown in Figure 2 comprises slot J1, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first chip U1.
1 pin of slot J1 looks like to be connected to power supply VCC with an end of first resistance R 1, an end of the 4th resistance R 4,7 pin of the first chip U1 respectively; 2 pin of J1 are connected with the other end of the 4th resistance R 4, an end of the 3rd resistance R 3,2 pin of the first chip U1 respectively; 1 pin of J1 is connected with 3 pin of an end first chip U1 of the other end of first resistance R 1, second resistance R 2 respectively, and the other end of the other end of second resistance R 2 and the 3rd resistance R 3 is connected to ground mutually; 1 pin of the first chip U1 is connected with an end of the 5th resistance R 5, and the other end of the 5th resistance R 5 is connected with 8 pin of the first chip U1; 4, the 5 pin ground connection of the first chip U1; Connect Pt100 platinum resistance thermometer sensor, sensor on the slot J1; The signal of the first chip U1 is the accurate instrumentation amplifier INA122 of Burr-Brown.
Single-chip microcomputer as shown in Figure 3 and AD module comprise first capacitor C 41, second capacitor C 42, the 3rd capacitor C 5, the 4th capacitor C 6, the 5th capacitor C 74, the 6th resistance R 28, the 7th resistance R 16, crystal oscillator X1, the second chip U2.
First capacitor C, 41 1 termination VSS, the other end are connected with the end of crystal oscillator X1,4 pin of the second chip U2 respectively; Second capacitor C, 42 1 termination VSS, the other end are connected with the other end of crystal oscillator X1,5 pin of the second chip U2 respectively; The 3rd capacitor C 5 one termination VSS, 6 pin of another termination second chip U2; The 4th capacitor C 6 one termination power VSS, 7 pin of another termination second chip U2; The 6th resistance R 28 1 end ground connection VDD, the other end is connected with 8 pin of the second chip U2, an end of the 5th capacitor C 74 respectively, another termination VSS of the 5th capacitor C 74; 20 pin of the second chip U2 connect an end of the 7th resistance R 16, another termination VDD of the 7th resistance R 16; The model of the second chip U2 is MB95F204K.
LCD MODULE as shown in Figure 4 comprises the 3rd chip U3, four-core sheet U4.
11 pin of 1 pin of the 3rd chip U3 and the second chip U2 join; 10 pin of 2 pin of the 3rd chip U3 and the second chip U2 join; 9 pin of 3 pin of the 3rd chip U3 and the second chip U2 join; 4 pin of the 3rd chip U3 meet VSS; 6 pin of the 3rd chip U3 and 1 pin of four-core sheet U4 join; 7 pin of the 3rd chip U3 and 3 pin of four-core sheet U4 join; 8 pin of the 3rd chip U3 and 2 pin of four-core sheet U4 join; 9 pin of the 3rd chip U3 and 4 pin of four-core sheet U4 join; 10 pin of the 3rd chip U3 and 9 pin of four-core sheet U4 join; 11 pin of the 3rd chip U3 and 10 pin of four-core sheet U4 join; 12 pin of the 3rd chip U3 and 11 pin of four-core sheet U4 join; 13 pin of the 3rd chip U3 and 12 pin of four-core sheet U4 join; 14 pin of the 3rd chip U3 and 13 pin of four-core sheet U4 join; 15 pin of the 3rd chip U3 and 14 pin of four-core sheet U4 join; 16 pin of the 3rd chip U3 and 15 pin of four-core sheet U4 join; 17 pin of the 3rd chip U3 and 16 pin of four-core sheet U4 join; 18 pin of the 3rd chip U3 and 5 pin of four-core sheet U4 join; 19 pin of the 3rd chip U3 and 6 pin of four-core sheet U4 join; 20 pin of the 3rd chip U3 and 7 pin of four-core sheet U4 join; 21 pin of the 3rd chip U3 and 8 pin of four-core sheet U4 join; The model of the 3rd chip U3 is BL55024; The model of four-core sheet U4 is TBP8900-LCD/A.
Key-press module as shown in Figure 5 comprises the first pull-up resistor R41, the second pull-up resistor R42, the first button KEY1, the second button KEY2.
The first pull-up resistor R41, one termination VDD, the other end are connected the other end ground connection of the second button KEY2 with 2 pin of the second chip U2, the end of the second button KEY2 respectively; The second pull-up resistor R42, one termination VDD, the other end are connected the other end ground connection of the second button KEY1 with 1 pin of the second chip U2, the end of the second button KEY1 respectively.
The Pt100 platinum resistance thermometer sensor, sensor that the present invention uses selects for use measurement range to be 0-100 ℃ platinum resistance thermometer sensor.
As shown in Figure 6, described Pt100 platinum resistance thermometer sensor, transducer probe assembly (1) is attached to tested blade surface (2).
As shown in Figure 7; Pt100 platinum resistance thermometer sensor, transducer probe assembly (2) places vanes fixed anchor clamps (6); Between vanes fixed anchor clamps (6) and the Pt100 platinum resistance thermometer sensor, transducer probe assembly (2) with polyfoam (4) as heat-barrier material; Make the heat transmission between Pt100 platinum resistance thermometer sensor, transducer probe assembly (2) and the vanes fixed anchor clamps drop to minimum, Pt100 platinum resistance thermometer sensor, working sensor face (3) is attached to tested blade surface (1) through the vanes fixed anchor clamps and measures and gather.
Claims (2)
1. plant leaf temperature measuring instrument is characterized in that: utilize paster Pt100 platinum resistance thermometer sensor, perception blade surface temperature; MB95F204K Fujitsu single-chip microcomputer is connected with key circuit with Pt100 platinum resistance thermometer sensor, sensor signal conditioning circuit, display screen respectively; Pt100 platinum resistance thermometer sensor, sensor signal is through a unequal electric bridge; The accurate instrumentation amplifier INA122 that produces with U.S. Burr-Brown is connected; Resistance signal is become voltage signal; The output voltage terminal V0 of output obtains temperature value through the single-chip microcomputer conversion calculations, and value is presented on the liquid crystal display, realizes the interactive function of user and instrument through button.
2. plant leaf temperature measuring instrument according to claim 1; It is characterized in that: described Pt100 platinum resistance thermometer sensor, sensor (1) is attached to tested blade (2) upper surface; Pt100 platinum resistance thermometer sensor, transducer probe assembly (2) places vanes fixed anchor clamps (6); Between vanes fixed anchor clamps (6) and the Pt100 platinum resistance thermometer sensor, transducer probe assembly (2) with polyfoam (4) as heat-barrier material; Make the heat transmission between Pt100 platinum resistance thermometer sensor, transducer probe assembly (2) and the vanes fixed anchor clamps drop to minimum, Pt100 platinum resistance thermometer sensor, working sensor face (3) is attached to tested blade surface (1) through the vanes fixed anchor clamps and measures and gather.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210052854.5A CN102564634B (en) | 2012-03-02 | 2012-03-02 | Measuring instrument for temperature of surface of plant leaf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210052854.5A CN102564634B (en) | 2012-03-02 | 2012-03-02 | Measuring instrument for temperature of surface of plant leaf |
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| Publication Number | Publication Date |
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| CN102564634A true CN102564634A (en) | 2012-07-11 |
| CN102564634B CN102564634B (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210052854.5A Expired - Fee Related CN102564634B (en) | 2012-03-02 | 2012-03-02 | Measuring instrument for temperature of surface of plant leaf |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234691A (en) * | 2013-04-24 | 2013-08-07 | 北京农业智能装备技术研究中心 | Greenhouse plant leaf air saturation vapor pressure deficit measuring device and measuring method |
| CN103308197A (en) * | 2013-06-15 | 2013-09-18 | 中国计量学院 | Clamping device for plant leaf surface physical parameter detection sensor |
| CN103487091A (en) * | 2013-09-27 | 2014-01-01 | 杭州宏量科技有限公司 | Multi-parameter real-time monitor for tobacco curing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2563574Y (en) * | 2002-07-16 | 2003-07-30 | 中国农业大学作物学院 | Blade temperature differential instrument |
| CN101852654A (en) * | 2010-05-11 | 2010-10-06 | 中国计量学院 | Plant leaf temperature measuring instrument |
| CN201607286U (en) * | 2009-12-31 | 2010-10-13 | 北京京鹏环球科技股份有限公司 | ZigBee-based wireless monitoring system for plant physiology and ecology |
| CN202133487U (en) * | 2011-07-01 | 2012-02-01 | 梁璇 | Temperature sensor for plant blade |
-
2012
- 2012-03-02 CN CN201210052854.5A patent/CN102564634B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2563574Y (en) * | 2002-07-16 | 2003-07-30 | 中国农业大学作物学院 | Blade temperature differential instrument |
| CN201607286U (en) * | 2009-12-31 | 2010-10-13 | 北京京鹏环球科技股份有限公司 | ZigBee-based wireless monitoring system for plant physiology and ecology |
| CN101852654A (en) * | 2010-05-11 | 2010-10-06 | 中国计量学院 | Plant leaf temperature measuring instrument |
| CN202133487U (en) * | 2011-07-01 | 2012-02-01 | 梁璇 | Temperature sensor for plant blade |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234691A (en) * | 2013-04-24 | 2013-08-07 | 北京农业智能装备技术研究中心 | Greenhouse plant leaf air saturation vapor pressure deficit measuring device and measuring method |
| CN103308197A (en) * | 2013-06-15 | 2013-09-18 | 中国计量学院 | Clamping device for plant leaf surface physical parameter detection sensor |
| CN103308197B (en) * | 2013-06-15 | 2015-05-27 | 中国计量学院 | Clamping device for plant leaf surface physical parameter detection sensor |
| CN103487091A (en) * | 2013-09-27 | 2014-01-01 | 杭州宏量科技有限公司 | Multi-parameter real-time monitor for tobacco curing |
| CN103487091B (en) * | 2013-09-27 | 2016-06-15 | 杭州宏量科技有限公司 | Flue-cured tobacco multi-parameters real-time monitoring instrument |
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| CN102564634B (en) | 2014-09-03 |
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