CN2174687Y - Portable device for monitoring crops growing - Google Patents

Abstract

The utility model discloses a portable device for monitoring crop growth, which is composed of an optical measurement part and a data processing and controlling part and is characterized in that the optical measurement part adopts a measurement method of double integrating sphere optical spectrum to obtain the spectrum reflection quantity and the transmission quantity of the crop lamina. The basic quantity of reflecting the moisture content of the lamina, the chlorophyll content, etc. for judging the growth of the crop can be obtained through processing and calculation. The obtained result by the portable device is objective and reliable, and the portable device for monitoring crop growth is not influenced by the light source, a detector and the performance change of the integrating sphere. No calibration source is provided, and the volume of the measuring apparatus is less than 0.05 cubic meters. The utility model has the advantages of portability and convenient operation and is suitable for general agricultural scientific research units.

Description

Portable device for monitoring crops growing

The utility model relates to a kind of photoelectric measuring device, particularly a kind of portable crop growth monitoring device.

The crop growth monitoring device is mainly used in to be estimated the understanding of crop growth situation and output, large tracts of land the yield by estimation for crops mainly is to analyze definite according to the multispectral photo in the face of land that satellite is taken at present, it comes its growing way is analyzed by the measurement to the spectral reflectivity of crops blade according to the space remote sensing technology, detector in this measuring technology generally carries calibration source, so it can be not because of the decay of detector influences measuring accuracy, accuracy is higher.But its deficiency is, only be applicable to the yield by estimation on a large scale, to the very difficult application of the yield by estimation of field piece among a small circle, and expense costliness, can't popularize use concerning general agri-scientific research unit, in addition, this satellite remote sensing test is subjected to climate effect bigger, because its test is to be benchmark with the sky brightness, weather changes and will bring error to test result.On March 1st, 1989, Chinese patent literature CN1031424A discloses a kind of wheat yield estimation technology, judges the growing way and estimation output of wheat by the electric capacity of measuring wheat population.Its measuring method is to utilize one or more groups test board to insert in the wheatland to test, obtain electric signal, receive processing by tester, thereby obtain the capacitance value of wheat population, the capacitance value of wheat population is main relevant with the water cut of wheat, can assess to wheat by the water cut of wheat.The deficiency of this then metering method maximum is that its measuring reliability is not high, because studies show that according to the value thing, the growing way quality of crops, not only how much relevant with water cut, the main factor affecting such as chlorophyllous content that also depends on only judges that with how many these factors of water cut the growing way of crops is unilateral.The measuring method of this measurement mechanism has determined it will have certain volume in addition, could satisfy test request, could reflect a test colony relatively all sidedly, the included scope of its test board will be magnitude with rice, and this kind measuring method wants the on-the-spot test point of arranging, operation is trouble comparatively.

The purpose of this utility model is to provide a kind of energy to satisfy monitoring among a small circle, the portable crop growth monitoring device that volume is little, practical, easy to operate.

The purpose of this utility model takes following measure to realize.It mainly comprises optical measuring system and data processing and control system, it is characterized in that optical measuring system is made up of the multispectral rotating disk of light source, three lens, driven by motor, splitting optical fiber and two photoswitches, two integrating spheres and clamping plate and two detectors.One of them lens is to be positioned at after the light source, other two lens are positioned at the incident fenestra place of two integrating spheres, on the light path between last lens and the integrating sphere, what be arranged in order is multispectral rotating disk and splitting optical fiber, the rotation of multispectral rotating disk is by data processing and control system control, the optical axis coincidence of the center of optical filter and last lens on the multispectral rotating disk, two photoswitches are separately positioned on two divided beams of splitting optical fiber, identical being positioned on the same central shaft of two integrating spheres size, one of them integrating sphere can move under external force vertically, the clamping plate that accompany plant leaf blade like this can insert between two integrating spheres, and it is compacted under the effect of spring, the light hole of two integrating spheres and incident fenestra are positioned at same axis and are oppositely arranged, clamping plate have the identical through hole of light hole size with integrating sphere on the clamping plate between two integrating spheres; Two detectors lay respectively on two integrating spheres and perpendicular test fenestra place, the line center of incident fenestra and light hole, and the output terminal of two detectors joins with data processing and control system respectively.The utility model is the growing way monitoring that double integrator photospheric spectrum measuring method is used for crops, utilize the biproduct bulb separation to obtain the spectral reflectance amount and the spectral transmission amount of crops blade, and its ratio carried out calculation process as spectral signature amount input data processing and control system, draw a plurality of numerical value such as crops water cut, chlorophyll content, understand crops growing way situation by these values.Its concrete measuring process is: in the field, the crops blade of gathering is placed in the clamping plate between the integrating sphere, after the light source works, light beam is assembled by first lens, optical filter filters and arrives splitting optical fiber on rotating disk, open one of them branch optical channel of splitting optical fiber this moment, another is closed, light beam is by the incident fenestra of branch optical channel transmission to an integrating sphere of splitting optical fiber, assemble through the lens of incident fenestra then, shine on the blade of clamping plate clamping from light hole, light reflects at blade surface, under the effect of integrating sphere, the detector that is positioned at integrating sphere test fenestra receives.Transmission also takes place in light in blade simultaneously, transmitted light directly enters another integrating sphere, under the effect of another integrating sphere, the detector that is positioned at this integrating sphere test fenestra receives, reflection, the optical signal transmissive that two detectors will be received becomes electric signal input data processing and control system is carried out computing, and operation result is stored.Next step closes the branch optical channel of the above splitting optical fiber of opening again, make another minute optical channel transmission of light beam from splitting optical fiber, lens by another integrating sphere incident fenestra place receive and assemble, light hole from this integrating sphere exposes on the clamping plate clamping blade again, by with above identical principle respectively by the detector on two integrating spheres receive the reflection and optical signal transmissive change electric signal into, be defeated by data processing and control system calculation process, draw operation result for the second time, twice operation result handled, eliminate detector, the influence of light source performance change just can draw required crop growth monitoring master data ... the spectral signature amount.Then by the moving position of driven by motor rotating disk revolution, change a wavelength, just can draw a corresponding spectral signature amount, these values are handled the water cut that computing just can analyze plant leaf blade, each fundamental quantity of reflection such as chlorophyll content growing way situation.Thereby judge the upgrowth situation of crops and carry out the output estimation.

The utility model is compared its significant advantage with existing method of testing: (1) this monitoring device is according to the crops spectral characteristic, utilize the spectral measurement method of biproduct bulb separation, reflect the growing state of crop from thread many-sides such as the water cut of plant leaf blade, chlorophyll contents, so conclusion is more objective and reliable; (2) for the fundamental quantity of reflection crops growing way, i.e. the acquisition of spectral signature amount has nothing to do with detector, light source, integrating sphere performance change, has guaranteed measuring accuracy; (3) the measurement mechanism volume less than in this device is 0.05 cubic metre, and the blade that only needs to gather crops during use in zones of different is placed on to measure in the instrument and get final product, and volume is little, and light weight portably uses all very conveniently, is applicable to that monitor in the field among a small circle; (4) this device does not use any reference source or on-gauge plate, so practicality is good, can extensively popularizes and is used for middle-size and small-size scientific research institutions or agrotechnician.

Concrete structure of the present utility model is provided by the following drawings and embodiment.

Accompanying drawing is the structural principle synoptic diagram of portable crop growth monitoring device described in the utility model.

According to accompanying drawing the utility model is described in further detail below.

According to portable crop growth monitoring device described in the utility model, mainly be made of optical measuring system and data processing and control system two parts, optical measuring system is made up of light source 1, lens 2, multispectral rotating disk 3, splitting optical fiber 4, photoswitch (5,6), lens (7,8), integrating sphere (9,10), clamping plate 11 and detector (12,13).Light source 1 adopts halogen tungsten lamp, lens 2 are positioned at after the light source 1, the incident bore of its size and splitting optical fiber 4 will be complementary, multispectral rotating disk 3 is between lens 2 and splitting optical fiber 4, along the circumferential direction be provided with the 8 piece optical filters of wavelength in 0.4 μ m～1.2 mu m ranges at multispectral rotating disk 3, rotating disk 3 rotates by a driven by motor and under control system control, each optical filter is on going to light path the time, its center should and lens 2 and splitting optical fiber 4 between optical axis coincidence, photoswitch (5,6) be contained in respectively on two divided beams passages of splitting optical fiber 4, transmission route with control bundle, integrating sphere (9,10) internal diameter is 40mm, all has the incident fenestra on each integrating sphere, light hole and instrument connection, incident fenestra and light hole are positioned on the same axis, axis and optical axis coincidence, during installation, the light hole of two integrating spheres is relative, integrating sphere 9 is fixed on the housing of device, the bottom of integrating sphere 10 has a spring assembly can make integrating sphere 10 displacement vertically under external force, lens (7,8) be arranged at integrating sphere (9,10) incident fenestra place, its size is wanted to satisfy the light that receives by the branch optical channel transmission of splitting optical fiber 4, clamping plate 11 are total to the thick aluminium sheet of 3mm by two and form, its center has and integrating sphere (9,10) the identical through hole of light hole size, clamping plate 11 are placed between two integrating spheres, and through hole communicates with the light hole of two integrating spheres.Detector (12,13) can be photosensitive tube or photoelectric tube, this example adopts photodiode, they are placed in integrating sphere (9,10) respectively and go up and the perpendicular instrument connection place of incident fenestra and light hole line center, two output terminals all join with data processing and control system 14, and data processing and control system 14 can be single card microcomputer and add computer interface.

Claims (1)

1. A kind of portable crop growth monitoring device, it mainly comprises optical measuring system and data processing and control system 14, it is characterized in that optical measuring system is made up of multispectral rotating disk (3), splitting optical fiber (4), photoswitch (5,6), lens (7,8), integrating sphere (9,10), clamping plate (11) and the detector (12,13) of light source (1), lens (2), driven by motor; At light source (1) and integrating sphere (9,10) be arranged in order lens (2) on the light path, multispectral rotating disk (3), splitting optical fiber (4), the rotation of multispectral rotating disk (3) is by data processing and control system (14) control, multispectral rotating disk (3) is gone up the center of optical filter and the optical axis coincidence of lens (2), photoswitch (5,6) be separately positioned on two divided beams of splitting optical fiber (4), lens (7,8) lay respectively at integrating sphere (9,10) incident fenestra place receives the light of two divided beams of splitting optical fiber (4), integrating sphere (9,10) size is identical, be positioned on the same central shaft, one of them integrating sphere can move under external force vertically, integrating sphere (9,10) two light holes and incident fenestra are positioned on the same axis and are oppositely arranged, clamping plate (11) are positioned at integrating sphere (9,10) between, the identical through hole of light hole size with integrating sphere is arranged on the clamping plate (11), detector (12,13) lay respectively at long-pending ball (9,10) on and the perpendicular test fenestra place, line center of incident fenestra and light hole, detector (12,13) output terminal and data processing and control system (14) are joined.

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