WO2005096798A1 - Device and procedure for seed counting in seed drill - Google Patents

Device and procedure for seed counting in seed drill Download PDF

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Publication number
WO2005096798A1
WO2005096798A1 PCT/SE2005/000478 SE2005000478W WO2005096798A1 WO 2005096798 A1 WO2005096798 A1 WO 2005096798A1 SE 2005000478 W SE2005000478 W SE 2005000478W WO 2005096798 A1 WO2005096798 A1 WO 2005096798A1
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WO
WIPO (PCT)
Prior art keywords
seed
control entity
line camera
connecting conduit
light
Prior art date
Application number
PCT/SE2005/000478
Other languages
French (fr)
Inventor
Fredrik Stark
Original Assignee
Väderstad-Verken Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Väderstad-Verken Ab filed Critical Väderstad-Verken Ab
Publication of WO2005096798A1 publication Critical patent/WO2005096798A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/08—Design features of general application for actuating the drive
    • G06M1/10—Design features of general application for actuating the drive by electric or magnetic means
    • G06M1/101—Design features of general application for actuating the drive by electric or magnetic means by electro-optical means
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • A01C7/08—Broadcast seeders; Seeders depositing seeds in rows
    • A01C7/10—Devices for adjusting the seed-box ; Regulation of machines for depositing quantities at intervals
    • A01C7/102—Regulating or controlling the seed rate
    • A01C7/105—Seed sensors
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • A01C7/08—Broadcast seeders; Seeders depositing seeds in rows
    • A01C7/081—Seeders depositing seeds in rows using pneumatic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M7/00—Counting of objects carried by a conveyor

Definitions

  • the invention refers to a device for seed counting in seed drills according to the ingress of Claim 1, and a procedure for seed counting according to the ingress of Claim 6.
  • Such a seed counting device is shown in DE 101 34 991.
  • a solution is shown where the flow of seed is diverted to a counting entity during a short time when the seed drill is disposed on the headland.
  • the solution brings disadvantages in the form of relatively slow feedback since seed counting can only occur on certain specific occasions.
  • the object of the invention is to provide a device for seed counting in seed drills where the abovementioned disadvantages are avoided and which allows total flow measuring with relatively rapid feedback.
  • the device should be able to be installed and used without extensive modifications of the rest of the seed drill.
  • the device should also be easy to maintain, easy to adjust and in general be independent of seed type and metering rate.
  • the device also has the object of providing a procedure for seed counting in seed drills where the abovementioned disadvantages are avoided and which allows total flow measuring with relatively rapid feedback, and which is in general independent of seed type and metering rate.
  • the object of the invention is solved by a device according to Claim 1.
  • a device By arranging a light source with essentially parallel beams that are detected by a line camera, the risk is minimised of a seed being shaded by another seed near the light source, alternatively of the seed near the light source being interpreted as several smaller seeds further away.
  • the line camera By arranging the line camera in the connecting conduit before the distributor head, this allows measurement of total flow and measuring comparatively near the dosing device, and also the air flow source, which provides the possibility for relatively rapid feedback.
  • Use of a line camera produces a comparatively time- specific and position- specific device which can thereby be made practically independent of seed size and metering rate.
  • a device according to Claim 2 with two essentially perpendicularly arranged line cameras where one can compare their results allows a second line camera to also identify seeds wholly or partly shielded from the first camera by other seeds, which gives an even better measurement result.
  • Claims 3-5 describe advantageous embodiments for the achievement of as good measurement results as possible.
  • Figure 1 shows a schematic view of the seed metering system of a seed drill.
  • Figure 2 shows a schematic view of a detection entity.
  • Figure 3 shows schematic images detected by the detection entity.
  • Figure 1 shows a schematic view of the pneumatic metering system of a tractor- drawn seed drill.
  • the seed is stored in a seed container 2 and conducted via a connecting conduit 4, here in the form of a pipe, further through a distribution device 5 connected to a plurality of seed nozzles 12 (only one shown in fig.), here in the form of seed coulters.
  • the distribution device 5 is here comprised of a distributor head 6 with a plurality of outlets 8 (only one shown in fig. 2) each connected to its individual seed coulter 12 via its individual hose 10 (only one shown in fig. 2).
  • a dosing device 14 of some type is arranged between the seed container 2 and the pipe 4.
  • An air flow source 16 in the form of a fan is adapted to generate an air flow that transports the seed from the seed container 2 to the seed nozzles 12 via the pipe 4, the distributor head 6 and the hoses 10.
  • a detection entity 18 according to the invention is arranged at the pipe 4.
  • the detection entity 18 is connected to a control entity 20 for signal transfer via one or several connections 22.
  • the control entity 20 is also connected to the dosing device 14 and in this case also the fan 16 via connections 23 , 25.
  • the detection entity 18 comprises a first light source 24, here in the form of a laser, arranged at the pipe 4 for sending parallel light beams via a first lens 26 essentially pe ⁇ endicular to the direction of flow in the pipe 4 across its entire cross-section.
  • a first line camera 28 (sometimes called photodiode array) is arranged at the opposite side of the pipe 4 with the aim of sensing the light level from the laser 24 across the entire width of the line camera 28.
  • the line camera 28 is connected to the control entity 20.
  • the detection entity 18 also comprises a second light source 30, here in the form of a laser, arranged at essentially the same axial position on the pipe 4 as the first laser 24.
  • the second laser 30 is adapted to send parallel light beams via a second lens 32 in essentially the same plane as the light beams of the first laser 24 but essentially pe ⁇ endicular to those beams across the entire cross-section of the pipe 4.
  • a second line camera 34 is arranged at the opposite side of the pipe 4 with the aim of sensing the light level from the second laser 30 across the entire width of the line camera 34.
  • the line camera 34 is also connected to the control entity 20.
  • the pipe 4 is suitably comprised of a metal pipe with essentially circular cross- section except in the area of the detection entity 18 where the cross-section is rectangular, preferably essentially quadratic with the aim that the light beams and the line cameras are able to detect the entire cross-section. This is achieved by mechanical reshaping of the pipe in this area.
  • the line cameras 28, 34 sense the light level at the respective width position and time and send data about this to the control entity 20 which is adapted to calculate the number of passed seeds from these data.
  • the control entity 20 compares the light level with a reference level and inte ⁇ rets levels below the reference level as being a seed passing the line camera, these shown by dark portions 40, 42, 44, 46, 48 in Figure 3.
  • the control entity 20 counts continuous width positions and continuous time-points with a light level below the reference level as the same seed. According to the example in Figure 3 the control entity accordingly counts that during trie time window t 0 -t 5 the first line camera 28 (cf. B ⁇ has detected two seeds 40, 42, one with start time ti and finish time t 3 , and one with start time t 2 and finish time t 4 .
  • control entity counts that during the time window t 0 -ts the second line camera 34 (cf. B 2 ) has however detected three seeds 44, 46, 48, one with start time t ! and finish time t 2 , one with start time ti and finish time t 3 and one with start time t 2 and finish time t 4 .
  • the control entity thereafter compares the results from both line cameras.
  • the control entity is adapted to count seeds detected with the same start time and finish time by both cameras as the same seed. In this comparison, it emerges that the detected seeds 40 and 48 both have start time t 2 and finish time t 4 , wherein the control entity thus counts these as the same seed. It also emerges that the detected seeds 42 and 46 both have start time ti and finish time t 3 wherein the control entity thus counts these as the same seed.
  • control entity according to the example in Figure 3 has identified in total three separate seeds detected by both line cameras during the time window t 0 -t 5 .
  • the control entity By in this way using two line cameras and comparing the results, one accordingly succeeds in detecting seed 44 which lay hidden behind seed 42, at least partly, for the first line camera (cf. Bi) and was therefore not identified as a separate seed by it.
  • the control entity is also provided with indata representing the desired number of seeds per area, the driving speed of the seed drill across the field, the setting of the dosing device, perhaps also the speed of the fan.
  • the control entity is adapted to calculate the desired number of seeds per unit time based on these indata. By comparing this set point with the detected and counted seeds the control entity can give signals to an influencing member not shown here for the dosing device and perhaps also the fan to influence its setting so that the actual metered amount of seeds per area agrees with the desired set point. Since the detection device is arranged near the dosing device, rapid feedback is possible.
  • the control entity can advantageously be adapted to receive insignals from the line cameras during a predetermined time window, preferably 1 -3 seconds, and thereafter calculate the number of passed seeds. Thereupon a new cycle of reception of new insignals during a new time window can be initiated.
  • the seed drill comprises for example a distributor head arranged inside the seed container. It is also possible to place the distributor head outside the seed container and/or to provide the seed drill with several distributor heads where each head is connected to the seed container via its individual connecting conduit and dosing device.
  • two line cameras are used to increase the accuracy. It is also possible to use a device with only one line camera. This is of course a simpler and cheaper solution but it does not produce as accurate results. Such a solution can however be advantageous on seed drills that are only used where the seed flow past the line camera is comparatively sparse, for example when sowing maize.
  • a further advantage with two line cameras is that the results can be compared and that one thereby can more easily indicate and notice any faults and damage to the device.
  • the seed counting entity can be encapsulated around the pipe to protect against dirt, moisture and other mechanical effect, in those cases where this can be expected to occur.
  • a further refinement comprises replaceable and/or cleanable protective glass or plastic or similar adapted to protect the light source and/or the camera against dirt from the flow in the pipe.

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  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Environmental Sciences (AREA)
  • Sowing (AREA)
  • Pretreatment Of Seeds And Plants (AREA)

Abstract

Device and procedure for seed counting in a seed drill comprising a seed container and an air flow source adapted to create an air flow to conduct crop seed in the form of seeds from the seed container to the seed nozzles via a connecting conduit (4). At least one light source (24, 30) is adapted to send parallel light beams essentially perpendicular to the direction of flow in the connecting conduit (4). At least one line camera (28, 34) is arranged at the opposite side of the connecting conduit (4) with the aim of sensing the light level from the light source (24, 30) and connected to a control entity (20) adapted to calculate the number of seeds that pass the line camera (28, 34) by comparing the light level across the width of the line camera over time.

Description

Device and procedure for seed counting in seed drill
The invention refers to a device for seed counting in seed drills according to the ingress of Claim 1, and a procedure for seed counting according to the ingress of Claim 6.
Background of the invention
There are today many tractor-drawn seed drills with pneumatic seed metering systems. Some of these seed drills are provided with some form of seed counting device with the aim of ensuring metering of the desired number of seeds per area.
Such a seed counting device is shown in DE 101 34 991. Here a solution is shown where the flow of seed is diverted to a counting entity during a short time when the seed drill is disposed on the headland. The solution brings disadvantages in the form of relatively slow feedback since seed counting can only occur on certain specific occasions.
Another device is shown in US 5 883 383. Here a light sensor is arranged in each feed pipe. The device thereby requires a plurality of sensor arrangements, alternatively only a part quantity is measured in one tube. Furthermore, this solution entails that if a seed passes close to the light source, there is a risk of it 'shading' other seeds which are therefore not detected and represent a source of error in the result.
Object of the invention
The object of the invention is to provide a device for seed counting in seed drills where the abovementioned disadvantages are avoided and which allows total flow measuring with relatively rapid feedback.
Furthermore the device should be able to be installed and used without extensive modifications of the rest of the seed drill. The device should also be easy to maintain, easy to adjust and in general be independent of seed type and metering rate.
The device also has the object of providing a procedure for seed counting in seed drills where the abovementioned disadvantages are avoided and which allows total flow measuring with relatively rapid feedback, and which is in general independent of seed type and metering rate.
Summary of the invention
The object of the invention is solved by a device according to Claim 1. By arranging a light source with essentially parallel beams that are detected by a line camera, the risk is minimised of a seed being shaded by another seed near the light source, alternatively of the seed near the light source being interpreted as several smaller seeds further away. By arranging the line camera in the connecting conduit before the distributor head, this allows measurement of total flow and measuring comparatively near the dosing device, and also the air flow source, which provides the possibility for relatively rapid feedback. Use of a line camera produces a comparatively time- specific and position- specific device which can thereby be made practically independent of seed size and metering rate.
A device according to Claim 2 with two essentially perpendicularly arranged line cameras where one can compare their results allows a second line camera to also identify seeds wholly or partly shielded from the first camera by other seeds, which gives an even better measurement result. Claims 3-5 describe advantageous embodiments for the achievement of as good measurement results as possible.
With a procedure according to Claim 6 good possibilities are obtained to identify each seed and to distinguish two or more seeds that pass the line camera essentially simultaneously.
According to Claim 7, by comparing the results from two line cameras arranged peφendicular to each other, the potential is provided to also identify seeds wholly or partly shaded by other seeds without any seeds being counted several times, which provides an even better measurement result.
The further characteristics and advantages of the invention are described more closely below with the help of an embodiment example and drawings related thereto.
Drawing summary
Figure 1 shows a schematic view of the seed metering system of a seed drill. Figure 2 shows a schematic view of a detection entity. Figure 3 shows schematic images detected by the detection entity.
Description of an embodiment example
Figure 1 shows a schematic view of the pneumatic metering system of a tractor- drawn seed drill. The seed is stored in a seed container 2 and conducted via a connecting conduit 4, here in the form of a pipe, further through a distribution device 5 connected to a plurality of seed nozzles 12 (only one shown in fig.), here in the form of seed coulters. The distribution device 5 is here comprised of a distributor head 6 with a plurality of outlets 8 (only one shown in fig. 2) each connected to its individual seed coulter 12 via its individual hose 10 (only one shown in fig. 2).
A dosing device 14 of some type is arranged between the seed container 2 and the pipe 4. An air flow source 16 in the form of a fan is adapted to generate an air flow that transports the seed from the seed container 2 to the seed nozzles 12 via the pipe 4, the distributor head 6 and the hoses 10.
A detection entity 18 according to the invention is arranged at the pipe 4. The detection entity 18 is connected to a control entity 20 for signal transfer via one or several connections 22. The control entity 20 is also connected to the dosing device 14 and in this case also the fan 16 via connections 23 , 25.
The detection entity 18 comprises a first light source 24, here in the form of a laser, arranged at the pipe 4 for sending parallel light beams via a first lens 26 essentially peφendicular to the direction of flow in the pipe 4 across its entire cross-section. A first line camera 28 (sometimes called photodiode array) is arranged at the opposite side of the pipe 4 with the aim of sensing the light level from the laser 24 across the entire width of the line camera 28. The line camera 28 is connected to the control entity 20.
The detection entity 18 also comprises a second light source 30, here in the form of a laser, arranged at essentially the same axial position on the pipe 4 as the first laser 24. The second laser 30 is adapted to send parallel light beams via a second lens 32 in essentially the same plane as the light beams of the first laser 24 but essentially peφendicular to those beams across the entire cross-section of the pipe 4. A second line camera 34 is arranged at the opposite side of the pipe 4 with the aim of sensing the light level from the second laser 30 across the entire width of the line camera 34. The line camera 34 is also connected to the control entity 20.
The pipe 4 is suitably comprised of a metal pipe with essentially circular cross- section except in the area of the detection entity 18 where the cross-section is rectangular, preferably essentially quadratic with the aim that the light beams and the line cameras are able to detect the entire cross-section. This is achieved by mechanical reshaping of the pipe in this area.
It is advantageous to arrange the detection entity 18 in a straight part of the pipe 4 since the risk of turbulence is lowest there. Otherwise one risks whirling seeds which risk passing the line cameras 28, 34 on several occasions causing erroneous measurement results.
The procedure for seed counting is described now with the help of Figure 3. There is shown an example of a picture that is detected by the first line camera 28 across its entire width Bj and a picture that is detected by the second line camera 34 across its entire width B2 as a function of time t.
The line cameras 28, 34 sense the light level at the respective width position and time and send data about this to the control entity 20 which is adapted to calculate the number of passed seeds from these data.
The control entity 20 compares the light level with a reference level and inteφrets levels below the reference level as being a seed passing the line camera, these shown by dark portions 40, 42, 44, 46, 48 in Figure 3. The control entity 20 counts continuous width positions and continuous time-points with a light level below the reference level as the same seed. According to the example in Figure 3 the control entity accordingly counts that during trie time window t0-t5 the first line camera 28 (cf. B^ has detected two seeds 40, 42, one with start time ti and finish time t3, and one with start time t2 and finish time t4.
Furthermore the control entity counts that during the time window t0-ts the second line camera 34 (cf. B2) has however detected three seeds 44, 46, 48, one with start time t! and finish time t2, one with start time ti and finish time t3 and one with start time t2 and finish time t4.
The control entity thereafter compares the results from both line cameras. The control entity is adapted to count seeds detected with the same start time and finish time by both cameras as the same seed. In this comparison, it emerges that the detected seeds 40 and 48 both have start time t2 and finish time t4, wherein the control entity thus counts these as the same seed. It also emerges that the detected seeds 42 and 46 both have start time ti and finish time t3 wherein the control entity thus counts these as the same seed.
It hereby follows thus that the control entity according to the example in Figure 3 has identified in total three separate seeds detected by both line cameras during the time window t0-t5. By in this way using two line cameras and comparing the results, one accordingly succeeds in detecting seed 44 which lay hidden behind seed 42, at least partly, for the first line camera (cf. Bi) and was therefore not identified as a separate seed by it.
The control entity is also provided with indata representing the desired number of seeds per area, the driving speed of the seed drill across the field, the setting of the dosing device, perhaps also the speed of the fan. The control entity is adapted to calculate the desired number of seeds per unit time based on these indata. By comparing this set point with the detected and counted seeds the control entity can give signals to an influencing member not shown here for the dosing device and perhaps also the fan to influence its setting so that the actual metered amount of seeds per area agrees with the desired set point. Since the detection device is arranged near the dosing device, rapid feedback is possible.
The control entity can advantageously be adapted to receive insignals from the line cameras during a predetermined time window, preferably 1 -3 seconds, and thereafter calculate the number of passed seeds. Thereupon a new cycle of reception of new insignals during a new time window can be initiated.
One can also if so desired use a solution where calculation occurs continuously and simultaneously with the signal reception, but this then requires greater processor capacity.
The above-described embodiment is not limiting for the invention which can be varied in a plurality of ways within the frame of the patent claims. According to the embodiment described, the seed drill comprises for example a distributor head arranged inside the seed container. It is also possible to place the distributor head outside the seed container and/or to provide the seed drill with several distributor heads where each head is connected to the seed container via its individual connecting conduit and dosing device.
According to the embodiment described two line cameras are used to increase the accuracy. It is also possible to use a device with only one line camera. This is of course a simpler and cheaper solution but it does not produce as accurate results. Such a solution can however be advantageous on seed drills that are only used where the seed flow past the line camera is comparatively sparse, for example when sowing maize.
A further advantage with two line cameras is that the results can be compared and that one thereby can more easily indicate and notice any faults and damage to the device.
According to the preferred refinements the seed counting entity can be encapsulated around the pipe to protect against dirt, moisture and other mechanical effect, in those cases where this can be expected to occur.
A further refinement comprises replaceable and/or cleanable protective glass or plastic or similar adapted to protect the light source and/or the camera against dirt from the flow in the pipe.

Claims

Claims
1. A device for seed counting in a seed drill comprising a seed container (2), at least one distribution device (5), a connecting conduit (4) between the seed container (2) and the distribution device (5), which distribution device (5) is connected to seed nozzles (12), an air flow source (16) adapted to create an air flow to conduct crop seed in the form of seeds from the seed container (2) to the seed nozzles (12), characterised in that at least one light source (24, 30) is arranged at one side of the connecting conduit (4) to send parallel light beams essentially peφendicular to the direction of flow in the connecting conduit (4) across the entire cross-section of the connecting conduit (4), that at least one line camera (28, 34) is arranged at the opposite side of the connecting conduit (4) with the aim of sensing the light level from the light source (24, 30) across the entire width (Bi, B2) of the line camera (28, 34), that the line camera (28, 34) is connected to a control entity (20), and that the control entity (20) is adapted to calculate the number of seeds that pass the line camera (28, 34) by comparing the light level across the entire width of the line camera (28, 34) over time (t).
2. A device according to Claim 1, wherein a second light source (30) is arranged at the connecting conduit (4) at essentially the same axial position on the conduit (4) as the first light source (24) to send parallel light beams in essentially the same plane as the light beams of the first light source (24) essentially peφendicular to these beams across the entire cross-section of the connecting conduit (4), that a second line camera (34) is arranged at the opposite side of the connecting conduit (4) with the aim of sensing the light level from the second light source (30) across the entire width (B2) of the second line camera, that the line cameras (28, 34) are connected to the control entity (20), and that the control entity (20) is adapted to calculate the number of seeds that pass the line cameras (28, 34) by comparing the light level across the entire width (Bi, B2) of the line cameras (28, 34) over time.
3. A device according to any one of the preceding claims, wherein the connecting conduit (4) at the axial position of the line camera (28, 34) has an essentially rectangular, preferably quadratic cross-section.
4. A device according to any one of the preceding claims, wherein the light source (24, 30) is comprised of a laser.
5. A device according to any one of the preceding claims, wherein the distribution device (5) is comprised of a distributor head (6) with a plurality of outlets (8), where each outlet (8) is connected to a seed nozzle (12), preferably in the form of a seed coulter.
6. Procedure for seed counting with a device according to any one of Claims
1-5, characterised in that the line camera (28, 34) sends signals to the control entity (20) corresponding to the light level at a number of different width positions (Bi, B2) at a number of specified time-points (t), that the control entity (20) compares the light level with a reference level, and that the control entity (20) counts continuous width positions (Bl5 B2) and continuous time-points (t) with a light level below a predetermined reference level as one seed.
7. Procedure for seed counting according to Claim 6 with a device according to any one of Claims 2-5, wherein the line cameras (28, 34) send signals to the control entity (20) corresponding to the light status at a number of different width positions (Bi, B2) at a number of specified time-points (t), that the control entity (20) compares the light level with a reference level, that the control entity (20) inteφrets continuous width positions (Bls B2) and continuous time-points (t) with a light level below a predetermined reference level as one seed detected by the actual camera (28, 34), and that the control entity (20) compares the results from both cameras (28, 34), that seeds detected with the same start time (t) and finish time (t) by both cameras (28, 34) are counted as the same seed.
PCT/SE2005/000478 2004-04-06 2005-04-01 Device and procedure for seed counting in seed drill WO2005096798A1 (en)

Applications Claiming Priority (2)

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SE0400932A SE0400932L (en) 2004-04-06 2004-04-06 Seed counting device and method of seed drill
SE0400932-0 2004-04-06

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EP1932413A1 (en) * 2006-12-13 2008-06-18 Amazonen-Werke H. Dreyer GmbH & Co. KG Device for optical counting of small bodies
DE102011001949A1 (en) 2011-04-11 2012-10-11 Fachhochschule Südwestfalen Seed heart monitoring device, sowing heart and precision seed drill
EP2807914A1 (en) 2013-05-27 2014-12-03 Kverneland ASA Seed spreader control device, seed spreader and single grain seeder
EP3014968A1 (en) 2014-10-31 2016-05-04 Alois Pöttinger Maschinenfabrik GmbH Agricultural application machine
EP3100603A1 (en) * 2015-06-02 2016-12-07 Horsch Maschinen GmbH Method and device for dosing and dispensing granular material
EP3189720A1 (en) * 2016-01-08 2017-07-12 Deere & Company Seed monitoring system and method of monitoring seeds
CN118350402A (en) * 2024-06-17 2024-07-16 杭州绿博仪器有限公司 Automatic grain counting instrument
US12050169B2 (en) 2019-03-22 2024-07-30 Precision Planting Llc Particle counting apparatus, systems and methods
EP4397165A3 (en) * 2022-02-03 2024-09-11 Amazonen-Werke H. Dreyer SE & Co. KG Soil working machine

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1779714A1 (en) * 2005-10-26 2007-05-02 Amazonen-Werke H. Dreyer GmbH & Co. KG Apparatus for optically counting small objects
EP1932413A1 (en) * 2006-12-13 2008-06-18 Amazonen-Werke H. Dreyer GmbH & Co. KG Device for optical counting of small bodies
US9185841B2 (en) 2011-04-11 2015-11-17 Kverneland As Sowing heart monitoring apparatus, sowing heart and single-seed drill
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