CN104330401A - Micro sensor applied to detection of nitrogen, phosphorus and potassium in soil - Google Patents
Micro sensor applied to detection of nitrogen, phosphorus and potassium in soil Download PDFInfo
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- CN104330401A CN104330401A CN201410577761.3A CN201410577761A CN104330401A CN 104330401 A CN104330401 A CN 104330401A CN 201410577761 A CN201410577761 A CN 201410577761A CN 104330401 A CN104330401 A CN 104330401A
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Abstract
The invention relates to a micro sensor applied to detection of nitrogen, phosphorus and potassium in soil, belonging to the technical field of detection sensors. The sensor is characterized in that an encapsulation protection layer, a liquid flow channel layer, a support layer and a printed circuit board layer are sequentially superposed, wherein a photoelectric sensor is encapsulated in the encapsulation protection layer; a liquid inlet hole and a liquid outlet hole are respectively formed in two sides of the encapsulation protection layer; a fluid flow channel is processed in the liquid flow channel layer and is respectively connected with the liquid inlet hole and the liquid outlet hole; an on-chip light source is encapsulated in the support layer; an operational amplifier, a microprocessor and a liquid crystal display screen are distributed on the printed circuit board layer. According to the sensor, micro chips are adopted by the light source and the photoelectric sensor; just dozens of microliters of to-be-detected liquid is required; a nutrient detector used in the traditional agriculture is shrunk to be 1/1000 of the original volume, so that convenience for detection of nitrogen, phosphorus and potassium is greatly improved; the manufacture cost of the device is greatly reduced; the micro sensor can be applied to large-scale batch production and has the advantages of being high in repeatability and high in stability.
Description
Technical field
The present invention relates to a kind of microminiaturized soil nitrogen phosphorus potassium detecting sensor, belong to detecting sensor technical field.
Background technology
Nowadays, along with the development of economic society and information industry, IT application to agriculture progressively obtains universal.Accurately, fast, real-time soil nitrogen phosphorus potassium information acquisition, be the necessary condition ensureing agricultural development.Wherein, the N P and K sensor of high stability ensures N P and K information acquisition core component accurately.
Traditional agriculture, N P and K detects and usually adopts artificial form to carry out.First carry out sampling pre-service to soil sample, then utilize main equipment analysis, this convenience detected for soil nitrogen phosphorus potassium proposes stern challenge.
There is bulky in traditional N P and K detecting sensor, the inside relates to complicated optical system, the sample to be tested needed is more, the problems such as cost of equipment maintenance is higher, therefore needs research and development a kind of microminiaturized, portable, low cost, highly sensitive N P and K detecting sensor badly.
Summary of the invention
The object of the invention is to propose a kind of microminiaturized soil nitrogen phosphorus potassium detecting sensor, to overcome the weak point of existing N P and K checkout equipment, make soil nitrogen phosphorus potassium checkout equipment microminiaturized, with reduced volume, reduce equipment cost.
The microminiaturized soil nitrogen phosphorus potassium detecting sensor that the present invention proposes, comprise light source and layer printed circuit board on photoelectric sensor, packaging protection layer, liquid stream channel layer, supporting layer, sheet, described packaging protection layer, liquid stream channel layer, supporting layer and layer printed circuit board overlap together successively mutually, described photosensor package is in the center bottom of packaging protection layer, and the both sides of packaging protection layer have inlet opening and fluid hole; Described liquid stream channel layer is processed with fluid course, and the both sides of flow channel for liquids are connected with fluid hole with the inlet opening on packaging protection layer respectively; On described sheet, light source is encapsulated in supporting layer center bottom; Described layer printed circuit board is furnished with operational amplifier, microprocessor and LCDs; described operational amplifier is connected with the photoelectric sensor in packaging protection layer by wire, and operational amplifier, microprocessor are connected by wire successively with LCDs.
The microminiaturized soil nitrogen phosphorus potassium detecting sensor that the present invention proposes, overcome the dependence to optical lens device in traditional detection means, light source and photoelectric sensor all adopt microminiaturized chip, liquid to be measured only needs tens microlitres, the nutrient detector used in traditional agriculture is reduced into the per mille of original volume, substantially increase the portability that N P and K detects, reduce the manufacturing cost of equipment by a larger margin, simultaneously, this sensor adopts the preparation of micro-nano technology technique, can large-scale mass production, there is the advantages such as reproducible, stability is high, cost of manufacture is low.
Accompanying drawing explanation
Fig. 1 is the structural profile schematic diagram of a kind of microminiaturized soil nitrogen phosphorus potassium detecting sensor that the present invention proposes.
Fig. 2 is the fundamental diagram of components and parts layer of the present invention.
In Fig. 1 and Fig. 2,1 is packaging protection layer, and 2 is liquid stream channel layer; 3 is supporting layers, and 4 is layer printed circuit boards, and 5 is inlet openings; 6 is wires, and 7 is photoelectric sensors, and 8 is fluid holes; 9 is flow channel for liquids; 10 is LCDs, and 11 is light sources on sheet, and 12 is operational amplifiers; 13 is microprocessors, and 14 is LCDs.
Embodiment
The microminiaturized soil nitrogen phosphorus potassium detecting sensor that the present invention proposes, its structure as shown in Figure 1, comprises light source 11 and layer printed circuit board 4 on photoelectric sensor 7, packaging protection layer 1, liquid stream channel layer 2, supporting layer 3, sheet.Packaging protection layer 1, liquid stream channel layer 2, supporting layer 3 and layer printed circuit board 4 overlap together successively mutually.Photoelectric sensor 7 is encapsulated in the center bottom of packaging protection layer 1, and the both sides of packaging protection layer 1 have inlet opening 5 and fluid hole 8.Liquid stream channel layer 2 is processed with fluid course 9, the both sides of flow channel for liquids 9 are connected with fluid hole 8 with the inlet opening 5 on packaging protection layer respectively.On sheet, light source 11 is encapsulated in the center bottom of supporting layer 3.Layer printed circuit board 4 is furnished with operational amplifier 12, microprocessor 13 and LCDs 14, as shown in Figure 2.Operational amplifier 12 is connected with the photoelectric sensor 7 in packaging protection layer 1 by wire 6, and operational amplifier 12, microprocessor 13 are connected by wire successively with LCDs 14.
The microminiaturized soil nitrogen phosphorus potassium detecting sensor that the present invention proposes, the principle of institute's foundation is: the n-p-k element in soil is when reacting from different colorimetric reagents respectively, different colors can be presented, concentration is higher, and color is just darker, and when irradiating colored solution with a branch of colored light, significantly light intensity attenuation can be produced, by detecting the degree of light intensity attenuation, the depth of solution colour can be judged, thus judge N-P-K content.
Below in conjunction with accompanying drawing, introduce the course of work of sensor of the present invention in detail:
1, soil is added water filter, obtain the limpid soil liquid;
2, the soil liquid is divided into three groups, three groups of soil liquid are mixed with nitrogen, phosphorus, potassium colorimetric reagent respectively, chromogenic reaction occurs, obtains nitrogen solution to be measured, phosphorus solution to be measured and potassium solution to be measured;
3, use syringe to injected nitrogen solution to be measured in inlet opening 5, then nitrogen concentration Test Switchboard is selected at layer printed circuit board, now microprocessor is according to the pre-set calibrating procedure in inside, generate color-concentration homologous thread, directly according to current color regime, show current nitrogen concentration on a liquid crystal display;
4, use syringe to inject clear water in inlet opening 5, solution to be measured for nitrogen is discharged, then inject phosphorus solution to be measured, can automatically clear water be ejected, now select phosphorus concentration Test Switchboard, liquid crystal display display phosphorus concentration;
5, in like manner, use syringe to inject clear water in inlet opening 5, solution to be measured for phosphorus is discharged, then inject potassium solution to be measured, can automatically clear water be ejected, now select potassium concn Test Switchboard, liquid crystal display display potassium concn.
In sensor of the present invention, board layer 4 adopts double-sided design, the back side is used for bedding components and parts, it mainly comprises LCDs 10 and microprocessor 13, front is light source 11 on bonding pad, its circuit working schematic diagram as shown in Figure 2, operational amplifier 12 changes the current signal that photoelectric sensor 7 collects into voltage signal, microprocessor 13 is MSP430 model single-chip microcomputer, the voltage signal collected is converted to digital signal by microprocessor 13 built-in A/D converter, and carry out data calibration, data calculate, the work such as data storage, LCDs 10 is general commercial lcd screen, for showing the N P and K concentration of current mensuration.Supporting layer 3 wherein adopts silica gel to prepare, and be not destroyed, and color is transparent for the protection of light source layer on sheet, can not stop light transmition, also plays the use of support liq runner layer simultaneously.Liquid stream channel layer 2 dimethyl silicone polymer (being called for short PDMS) material preparation wherein, a layer thickness is about the PDMS layer of 600um, pyroprocessing is carried out to it, make it solidify, by means such as laser ablations, process the flow channel for liquids 9 that a degree of depth is about 300um, on this PDMS, then cover the thin PDMS layer of one deck 200um, above thin PDMS layer, have inlet opening 5 and fluid hole 8.Photosensor layer 7 adopts common photodiode, is covered on liquid stream channel layer, and is connected with microprocessor 13 by wire 6.Packaging protection layer 7 adopts dimethyl silicone polymer (being called for short PMMA), for covering the position of fixed light electric transducer, and whole sensor package is protected.
The foregoing describe ultimate principle of the present invention and major advantage of the present invention; the technician of the industry should understand; the present invention just describes ultimate principle of the present invention in embodiment and instructions; be not restricted to the described embodiments; the present invention also has various improvement, and these improvement all should fall within scope.
Claims (1)
1. a microminiaturized soil nitrogen phosphorus potassium detecting sensor, it is characterized in that this detecting sensor comprises light source and layer printed circuit board on photoelectric sensor, packaging protection layer, liquid stream channel layer, supporting layer, sheet, described packaging protection layer, liquid stream channel layer, supporting layer and layer printed circuit board overlap together successively mutually, described photosensor package is in the center bottom of packaging protection layer, and the both sides of packaging protection layer have inlet opening and fluid hole; Described liquid stream channel layer is processed with fluid course, and the both sides of flow channel for liquids are connected with fluid hole with the inlet opening on packaging protection layer respectively; On described sheet, light source is encapsulated in supporting layer center bottom; Described layer printed circuit board is furnished with operational amplifier, microprocessor and LCDs; described operational amplifier is connected with the photoelectric sensor in packaging protection layer by wire, and operational amplifier, microprocessor are connected by wire successively with LCDs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410577761.3A CN104330401A (en) | 2014-10-24 | 2014-10-24 | Micro sensor applied to detection of nitrogen, phosphorus and potassium in soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410577761.3A CN104330401A (en) | 2014-10-24 | 2014-10-24 | Micro sensor applied to detection of nitrogen, phosphorus and potassium in soil |
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| CN104330401A true CN104330401A (en) | 2015-02-04 |
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| CN201410577761.3A Pending CN104330401A (en) | 2014-10-24 | 2014-10-24 | Micro sensor applied to detection of nitrogen, phosphorus and potassium in soil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105973823A (en) * | 2016-06-22 | 2016-09-28 | 苏州汶颢芯片科技有限公司 | UV-visible absorption detection system based on micro-fluidic chip and detection method thereof |
| CN108072739A (en) * | 2017-12-21 | 2018-05-25 | 北京盈盛恒泰科技有限责任公司 | A kind of gas controlling device |
| CN110763823A (en) * | 2019-11-22 | 2020-02-07 | 威海精讯畅通电子科技有限公司 | Handheld rapid soil detector and detection method |
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Cited By (4)
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| CN105973823A (en) * | 2016-06-22 | 2016-09-28 | 苏州汶颢芯片科技有限公司 | UV-visible absorption detection system based on micro-fluidic chip and detection method thereof |
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| CN110763823B (en) * | 2019-11-22 | 2022-04-12 | 威海精讯畅通电子科技有限公司 | Handheld rapid soil detector and detection method |
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