CN218446722U - Infrared counter with high accuracy - Google Patents
Infrared counter with high accuracy Download PDFInfo
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- CN218446722U CN218446722U CN202221845750.5U CN202221845750U CN218446722U CN 218446722 U CN218446722 U CN 218446722U CN 202221845750 U CN202221845750 U CN 202221845750U CN 218446722 U CN218446722 U CN 218446722U
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Abstract
The utility model relates to an infrared counter with high accuracy, which comprises N same infrared emitters, N same infrared receiving tubes and a counting circuit; the lens barrel of each infrared emitter is internally provided with an infrared light-emitting diode, a first convex cylindrical lens, a second convex cylindrical lens and a concave cylindrical lens from front to back in sequence, focal lines of the first convex cylindrical lens, the second convex cylindrical lens and the concave cylindrical lens are parallel to each other and are positioned in the same plane, the central line of the lens barrel is also positioned in the plane and is vertical to the focal lines of the first convex cylindrical lens, the second convex cylindrical lens and the concave cylindrical lens, the center of the infrared light-emitting diode is positioned at the intersection point of the central line of the lens barrel and the front focal line of the first convex cylindrical lens, the rear focal line of the second convex cylindrical lens is superposed with the rear focal line of the concave cylindrical lens, and the rear end of the lens barrel is open; the infrared light emitting diodes in the N infrared receiving tubes and the N infrared transmitters are connected with the counting circuit; the utility model discloses the count is more accurate, and simple structure, with low costs.
Description
The technical field is as follows:
the utility model relates to a counter, in particular to infrared counter that the degree of accuracy is high.
The background art comprises the following steps:
in daily production and life, people often need to detect and count the number of people entering and exiting a public place or the number of products moving on a production line, which has important significance for the efficient utilization of public place (such as public buildings) resources and the efficient production of enterprise products. Through the statistics of the number of the personnel, the resource utilization condition of the public place can be mastered, and reasonable management and control measures are taken; through the statistics of the product quantity, the production information of the product can be mastered, the production links are arranged and adjusted, and the production efficiency is improved. Currently, an infrared counter, a laser counter or a video monitoring system is generally adopted when people or product quantity statistics is carried out.
The existing infrared counter generally adopts an infrared light-emitting diode as a light source, the light emission of the infrared light-emitting diode is dispersed, the optical density is low, the emission area is wide, when an adjacent detected target is close to or the detected target passes through the detection area of the infrared counter (for example, when a person passes through the door but does not enter the door, the counter can feel reflected light to count), the counting is easy to be mistakenly counted, the counting accuracy is low, and particularly in the occasions where light transmission is interfered by smoke and the like. Although the laser counter can improve the counting accuracy, the laser counter adopts an expensive laser as a light source, and the construction cost is high. Although the video monitoring system can also count, the video monitoring system is too high in construction cost, not suitable for multi-point detection, large in power consumption and not beneficial to energy conservation and environmental protection.
The utility model has the following contents:
the to-be-solved technical problem of the utility model is: the utility model provides an infrared counter that the degree of accuracy is high, this infrared counter compare with current infrared counter, count more accurate, and its simple structure, with low costs.
The technical scheme of the utility model:
an infrared counter with high accuracy comprises N identical infrared transmitters, N identical infrared receiving tubes and a counting circuit; each infrared emitter comprises an infrared light-emitting diode, a first convex cylindrical lens, a second convex cylindrical lens, a concave cylindrical lens and a lens barrel, wherein the infrared light-emitting diode, the first convex cylindrical lens, the second convex cylindrical lens and the concave cylindrical lens are sequentially installed in the lens barrel from front to back; the infrared light emitting diodes in the N infrared receiving tubes and the N infrared emitters are connected with a counting circuit; n is a natural number of 1 or more.
Divergent infrared light emitted by the infrared light-emitting diode is refracted by the first convex cylindrical lens, the second convex cylindrical lens and the concave cylindrical lens and then converged into a beam of thin light, so that the light can be prevented from being emitted to people and objects which do not need to be detected, and the target can be accurately detected.
N is 2, and the infrared receiving tube is an infrared receiving diode; the counting circuit comprises a microprocessor, two voltage comparators and a direct current power supply, wherein two infrared receiving tubes are respectively connected with the input ends of the two voltage comparators, the output ends of the two voltage comparators are respectively connected with two signal input ends of the microprocessor, two infrared light-emitting diodes are respectively connected between the positive output end of the direct current power supply and the ground in parallel through a current-limiting resistor, and the direct current power supply also supplies power to the microprocessor and the voltage comparators.
The first convex cylindrical lens and the second convex cylindrical lens are both plano-convex cylindrical lenses, and the concave cylindrical lens is a plano-concave cylindrical lens.
The width of concave cylindrical lens is less than the width of second convex cylindrical lens, and the width of first convex cylindrical lens is the same with the width of second convex cylindrical lens.
The lens cone is a rectangular cylinder.
In practical application, an infrared transmitter and an infrared receiving tube form a detection group, in the detection group, infrared light emitted by the infrared transmitter is reflected back after being emitted to a target, and is received by the infrared receiving tube, so that a signal at the output end of a voltage comparator connected with the infrared receiving tube is changed, and the changed signal is processed after being detected by a microprocessor.
The infrared counter is used for counting the number of people in a classroom, one detection group is arranged at one side outside a classroom door, the other detection group is arranged at one side inside the classroom door, the installation heights of the two detection groups are the same, and then the position of the infrared emitter is adjusted to enable the light emitted by the infrared emitter to be parallel to the door; when someone enters a classroom, a detection group arranged at one side outside a classroom door detects signals and transmits the signals to a microprocessor, the detection group arranged at one side inside the classroom door detects the signals and transmits the signals to the microprocessor, and the microprocessor receives the two groups of signals and processes the signals to increase a count value by 1; when a person leaves a classroom, the detection group arranged on one side inside the classroom door firstly detects signals and transmits the signals to the microprocessor, the detection group arranged on one side outside the classroom door detects the signals and transmits the signals to the microprocessor, and the microprocessor receives the signals and then processes the signals to subtract 1 from the count value.
The utility model has the advantages that:
1. the utility model discloses an infrared light that infrared emitting diode sent diverged converges into a branch of thin slice shape after the refraction of first convex cylindrical lens, second convex cylindrical lens and concave cylindrical lens, has not only improved the infrared ray's of launch optical density like this, still can launch the infrared ray accurately to the target that is detected on, has avoided detecting the error, makes the count more accurate.
2. The utility model has the advantages of simple structure, with low costs, sexual valence relative altitude are suitable for a large amount of uses.
3. The utility model discloses an infrared emitter has adopted infrared emitting diode, consequently, its low power dissipation, energy-concerving and environment-protective.
Description of the drawings:
FIG. 1 is a schematic diagram of an infrared emitter;
FIG. 2 isbase:Sub>A schematic sectional view A-A of FIG. 1;
FIG. 3 is a schematic diagram of the optical path of FIG. 1;
FIG. 4 is a schematic diagram of the optical path of FIG. 2;
FIG. 5 is a schematic circuit diagram of a counter circuit;
fig. 6 is a schematic view showing the installation positions of the infrared ray emitter and the infrared ray receiving tube.
The specific implementation mode is as follows:
referring to fig. 1 to 6, the infrared counter with high accuracy includes 2 identical infrared emitters (5, 6), 2 identical infrared receiving tubes (S1, S2), and a counting circuit; each infrared emitter 5 comprises an infrared light-emitting diode L1, a first convex cylindrical lens 1, a second convex cylindrical lens 2, a concave cylindrical lens 3 and a lens barrel 4, wherein the infrared light-emitting diode L1, the first convex cylindrical lens 1, the second convex cylindrical lens 2 and the concave cylindrical lens 3 are sequentially installed in the lens barrel 4 from front to back, focal lines of the first convex cylindrical lens 1, the second convex cylindrical lens 2 and the concave cylindrical lens 3 are parallel to each other and are positioned in the same plane, a central line OO ' of the lens barrel 4 is also positioned in the plane, the central line OO ' of the lens barrel is perpendicular to focal lines of the first convex cylindrical lens 1, the second convex cylindrical lens 2 and the concave cylindrical lens 3, the center of the infrared light-emitting diode L1 is positioned at the intersection point of the central line OO ' of the lens barrel 4 and the front focal line of the first convex cylindrical lens 1, the rear focal line of the second convex cylindrical lens 2 is coincident with the rear focal line of the concave cylindrical lens 3, the front end of the lens barrel 4 is closed, and the rear end of the lens barrel 4 is opened; the infrared light emitting diodes (L1, L2) in the 2 infrared receiving tubes (S1, S2) and the 2 infrared transmitters (5, 6) are connected with the counting circuit.
Divergent infrared light emitted by the infrared light-emitting diode L1 is refracted by the first convex cylindrical lens 1, the second convex cylindrical lens 2 and the concave cylindrical lens 3 and then converged into a beam of thin light, so that the light can be prevented from being emitted to people and objects which do not need to be detected, and the target can be accurately detected.
The infrared receiving tubes (S1, S2) are infrared receiving diodes; the counting circuit comprises a microprocessor, a voltage comparator U4 (including two voltage comparators) and a direct-current power supply, two infrared receiving tubes (S1 and S2) are respectively connected to two input ends of the voltage comparator U4, two output ends (OUT 1 and OUT 2) of the voltage comparator U4 are respectively connected with two signal input ends of the microprocessor, two infrared light-emitting diodes (L1 and L2) are respectively connected between a positive output end +5V of the direct-current power supply and the ground in parallel through current-limiting resistors (R21 and R22), and the direct-current power supply also supplies power to the microprocessor and the voltage comparator U4. The type of the voltage comparator U4 is as follows: LM393.
The first convex cylindrical lens 1 and the second convex cylindrical lens 2 are both plano-convex cylindrical lenses, and the concave cylindrical lens 3 is a plano-concave cylindrical lens.
The width of concave cylindrical lens 3 is less than the width of second convex cylindrical lens 2, and the width of first convex cylindrical lens 1 is the same with the width of second convex cylindrical lens 2.
The lens barrel 4 is a rectangular cylinder.
In practical application, the infrared transmitter 5 and the infrared receiving tube S1 form a detection group, the infrared transmitter 6 and the infrared receiving tube S2 form another detection group, in each detection group, infrared light emitted by the infrared transmitter is reflected back after being emitted to a target, and is received by the infrared receiving tube, and a signal at the output end of the voltage comparator U4 connected with the infrared receiving tube is changed, and the changed signal is processed after being detected by the microprocessor.
When the infrared counter is used for counting the number of people in a classroom, one detection group is arranged on one side outside a classroom door 8, the other detection group is arranged on one side inside the classroom door 8, the installation heights of the two detection groups are the same, and then the positions of infrared emitters (5 and 6) are adjusted to enable the emitted light rays in a sheet shape to be parallel to the door 8; when a person 7 enters a classroom, a detection group arranged at one side outside a classroom door 8 detects a signal (low level) and transmits the signal to a microprocessor, a detection group arranged at one side inside the classroom door 8 detects that the signal (low level) is also transmitted to the microprocessor, and the microprocessor receives the two groups of signals and then processes the signals to add 1 to a counting value; when someone walks out of the classroom, the detection group arranged on one side in the classroom door 8 detects a signal (low level) and transmits the signal to the microprocessor, the detection group arranged on one side outside the classroom door 8 detects the signal (low level) and transmits the signal to the microprocessor, and the microprocessor receives the signal and then processes the signal to reduce the count value by 1.
Claims (5)
1. An infrared counter with high accuracy, which is characterized in that: the device comprises N identical infrared transmitters, N identical infrared receiving tubes and a counting circuit; each infrared emitter comprises an infrared light-emitting diode, a first convex cylindrical lens, a second convex cylindrical lens, a concave cylindrical lens and a lens barrel, wherein the infrared light-emitting diode, the first convex cylindrical lens, the second convex cylindrical lens and the concave cylindrical lens are sequentially installed in the lens barrel from front to back; the infrared light emitting diodes in the N infrared receiving tubes and the N infrared emitters are connected with a counting circuit; n is a natural number of 1 or more.
2. The infrared counter with high accuracy as set forth in claim 1, wherein: n is 2, and the infrared receiving tube is an infrared receiving diode; the counting circuit comprises a microprocessor, two voltage comparators and a direct current power supply, wherein the two infrared receiving tubes are respectively connected with the input ends of the two voltage comparators, the output ends of the two voltage comparators are respectively connected with two signal input ends of the microprocessor, the two infrared light emitting diodes are respectively connected between the positive output end of the direct current power supply and the ground in parallel through a current limiting resistor, and the direct current power supply also supplies power to the microprocessor and the voltage comparators.
3. The infrared counter with high accuracy as set forth in claim 1, wherein: the first convex cylindrical lens and the second convex cylindrical lens are both plano-convex cylindrical lenses, and the concave cylindrical lens is a plano-concave cylindrical lens.
4. The infrared counter with high accuracy as set forth in claim 1, wherein: the width of the concave cylindrical lens is smaller than that of the second convex cylindrical lens, and the width of the first convex cylindrical lens is the same as that of the second convex cylindrical lens.
5. The infrared counter with high accuracy as set forth in claim 1, wherein: the lens cone is a rectangular cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221845750.5U CN218446722U (en) | 2022-07-18 | 2022-07-18 | Infrared counter with high accuracy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221845750.5U CN218446722U (en) | 2022-07-18 | 2022-07-18 | Infrared counter with high accuracy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218446722U true CN218446722U (en) | 2023-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221845750.5U Active CN218446722U (en) | 2022-07-18 | 2022-07-18 | Infrared counter with high accuracy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218446722U (en) |
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2022
- 2022-07-18 CN CN202221845750.5U patent/CN218446722U/en active Active
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