CN110220541B - Infrared detection device and infrared photoelectric sensor - Google Patents
Infrared detection device and infrared photoelectric sensor Download PDFInfo
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- CN110220541B CN110220541B CN201910412898.6A CN201910412898A CN110220541B CN 110220541 B CN110220541 B CN 110220541B CN 201910412898 A CN201910412898 A CN 201910412898A CN 110220541 B CN110220541 B CN 110220541B
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- 238000001514 detection method Methods 0.000 title claims abstract description 64
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
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Abstract
The invention provides an infrared detection device and an infrared photoelectric sensor, wherein the infrared detection device comprises: a first resistor; an infrared emission tube; a drive tube; a second resistor; an infrared receiving tube; the filter circuit is connected with the second pole of the infrared receiving tube and is used for filtering out direct current signals in the input pulse signals; a voltage comparison circuit. According to the infrared detection device and the infrared photoelectric sensor, the control electrode of the driving tube is used for inputting a pulse control signal, when the driving tube is switched on, the infrared emission tube emits infrared rays, and when the driving tube is switched off, the infrared emission tube stops emitting the infrared rays, so that the infrared detection device works in a pulse mode with a low duty ratio, the energy consumption can be reduced, and the working time of the infrared detection device on battery equipment is prolonged; the filter circuit can filter out direct current signals generated by ambient light interference, can avoid interference of infrared rays in ambient light, and can still normally work under the condition of strong outdoor light.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an infrared detection device and an infrared photoelectric sensor.
Background
The infrared photoelectric sensor can be used for detecting the change of ground light and shade and color and detecting whether an approaching object exists or not.
In the related art, a circuit of an infrared photoelectric sensor is generally shown in fig. 1, an infrared transmitting tube of an infrared pair tube emits infrared light, the infrared light is reflected by a tested object and received by an infrared receiving tube, the infrared receiving tube generates corresponding current according to the intensity of received light, the current generates voltage drop after passing through a pull-up resistor of the infrared receiving tube, and when the voltage drop reaches a threshold value set by a comparator LM393 (when the tested object is close enough), the comparator deflects, and the tested object is detected.
However, the above-mentioned techniques have at least the following technical problems:
(1) poor resistance to ambient light interference, especially natural light. Because the sun contains a large amount of infrared rays, the detection distance is changed, even the infrared receiving tube is completely saturated, and the normal work is difficult under the condition of strong outdoor light;
(2) the infrared transmitting tube continuously works, a large amount of electric energy can be consumed, and when the infrared transmitting tube is used on battery equipment, the battery is consumed quickly, and the working time is short.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present invention is to provide an infrared detection device, wherein a control electrode of a driving tube is used for inputting a pulse control signal, when the driving tube is turned on, the infrared emission tube emits infrared rays, and when the driving tube is turned off, the infrared emission tube stops emitting infrared rays, so that the infrared detection device operates in a pulse mode with a low duty ratio, which can reduce energy consumption and increase the operating time of the infrared detection device on a battery device; the filter circuit can filter out direct current signals generated by ambient light interference, can avoid interference of infrared rays in ambient light, and can still normally work under the condition of strong outdoor light.
A second object of the present invention is to provide an infrared photoelectric sensor.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an infrared detection apparatus, including:
a first resistor;
the anode of the infrared emission tube is connected with a first direct current power supply through the first resistor;
the first pole of the driving tube is connected with the cathode of the infrared emission tube, the second pole of the driving tube is grounded, and the control pole of the driving tube is used for inputting a pulse control signal;
a second resistor;
the first pole of the infrared receiving tube is connected with the first direct current power supply, and the second pole of the infrared receiving tube is grounded through the second resistor;
the filter circuit is connected with the second pole of the infrared receiving tube and is used for filtering out direct current signals in the input pulse signals;
and the voltage comparison circuit is respectively connected with the filter circuit and the signal output end of the infrared detection device, and is used for outputting pulse signals with the same frequency when the amplitude of the input pulse signals reaches a set amplitude threshold value.
According to the infrared detection device provided by the embodiment of the invention, the control electrode of the driving tube is used for inputting a pulse control signal, when the driving tube is switched on, the infrared emission tube emits infrared rays, and when the driving tube is switched off, the infrared emission tube stops emitting the infrared rays, so that the infrared detection device works in a pulse mode with low duty ratio, the energy consumption can be reduced, and the working time of the infrared detection device on battery equipment is increased; the filter circuit can filter out direct current signals generated by ambient light interference, can avoid interference of infrared rays in ambient light, and can still normally work under the condition of strong outdoor light.
According to one embodiment of the present invention, the filter circuit includes: a first end of the first capacitor is connected with the second pole of the infrared receiving tube, and a second end of the first capacitor is connected with the voltage comparison circuit; and a first end of the third resistor is connected with the second end of the first capacitor, and a second end of the third resistor is grounded.
According to one embodiment of the present invention, the voltage comparison circuit includes: and the positive input end of the comparator is connected with the filter circuit, the negative input end of the comparator is used for inputting the set amplitude threshold value, and the output end of the comparator is connected with the signal output end of the infrared detection device.
According to an embodiment of the present invention, the infrared detection apparatus further includes: and the second pole of the infrared receiving tube is connected with the filter circuit through the voltage follower circuit, and the voltage follower circuit is used for buffering an input pulse signal.
According to one embodiment of the present invention, the voltage follower circuit includes: and the positive input end of the first operational amplifier is connected with the second pole of the infrared receiving tube, and the negative input end of the first operational amplifier is respectively connected with the output end of the first operational amplifier and the filter circuit.
According to an embodiment of the present invention, the infrared detection apparatus further includes: the filter circuit is connected with the voltage comparison circuit through the in-phase amplification circuit, and the in-phase amplification circuit is used for carrying out amplitude amplification processing on an input pulse signal.
According to an embodiment of the present invention, the in-phase amplifying circuit includes: a fourth resistor; a fifth resistor; a sixth resistor; and the input positive end of the second operational amplifier is connected with the filter circuit through the fourth resistor, the input negative end of the second operational amplifier is grounded through the fifth resistor, the input negative end of the second operational amplifier is connected with the output end of the second operational amplifier through the sixth resistor, and the output end of the second operational amplifier is connected with the voltage comparison circuit.
According to an embodiment of the present invention, the infrared detection apparatus further includes: and the voltage stabilizing circuit is connected with the signal output end of the infrared detection device through the voltage stabilizing circuit and is used for carrying out voltage stabilizing treatment on the input pulse signal and eliminating jitter.
According to one embodiment of the invention, the voltage stabilizing circuit comprises: a schmitt trigger.
In order to achieve the above object, a second embodiment of the present invention provides an infrared detection device, including: a controller and an infrared detection device according to an embodiment of the first aspect of the present invention; the controller is connected with the signal output end of the infrared detection device and used for determining whether an object is detected according to the input pulse signal.
Drawings
Fig. 1 is a circuit diagram of a detection device of an infrared photoelectric sensor in the related art;
FIG. 2 is a block diagram of an infrared detection device in accordance with one embodiment of the present invention;
FIG. 3 is a circuit diagram of an infrared detection device according to one embodiment of the present invention;
figure 4 is a block diagram of an infrared photosensor according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The infrared detection device and the infrared photoelectric sensor according to the embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 2 is a structural view of an infrared detection apparatus according to an embodiment of the present invention, as shown in fig. 2, the infrared detection apparatus including:
a first resistor R1;
an anode of the infrared emission tube D2 and an anode of the infrared emission tube D2 are connected with a first direct current power supply VCC through a first resistor R1;
a driving tube Q1, wherein a first pole of the driving tube Q1 is connected with the cathode of the infrared emission tube D2, a second pole of the driving tube Q1 is grounded, and a control pole of the driving tube Q1 is used for inputting a pulse control signal;
a second resistor R2;
the infrared receiving tube D1, the first pole of the infrared receiving tube D1 is connected with the first DC power VCC, the second pole of the infrared receiving tube D1 is earthed through the second resistor R2;
the filter circuit 11, the filter circuit 11 is connected with the second pole of the infrared receiving tube D1, the filter circuit 11 is used for filtering the direct current signal in the input pulse signal;
and the voltage comparison circuit 12, the voltage comparison circuit 12 is respectively connected with the filter circuit 11 and the signal output end signal out of the infrared detection device, and the voltage comparison circuit 12 is used for outputting the pulse signal with the same frequency when the amplitude of the input pulse signal reaches a set amplitude threshold value.
In the embodiment of the present invention, the driving transistor Q1 may be an NPN transistor as shown in fig. 2, and the control terminal thereof may be a base of the transistor. As shown in fig. 2, the gate of the driving transistor Q1 is used for inputting a pulse control signal Drive _ signal, which is generated by a controller or other external devices. When the Drive _ signal is at a high level, the driving tube Q1 is switched on, so that the loop of the infrared transmitting tube D2 is switched on, current passes through the infrared transmitting tube D2 to emit infrared rays, and when the Drive _ signal is at a low level, the driving tube Q1 is switched off, so that the loop of the infrared transmitting tube D2 is switched off, no current passes through the infrared transmitting tube D2 to stop emitting infrared rays, so that the infrared detection device can work in a pulse mode with a low duty ratio, the energy consumption can be reduced, and the working time of the infrared detection device on a battery device can be increased.
The infrared receiving tube D2 generates a corresponding current according to the received light intensity, the current passes through the second resistor R2 to generate a corresponding voltage signal on the second resistor R2, and since the infrared transmitting tube D2 operates in the pulse mode and the ambient light interference is mainly represented by a strong dc signal, the voltage signal on the second resistor R2 is a pulse signal (useful signal) superimposed on the dc signal (ambient light interference signal). The filter circuit 11 is connected to the second pole of the infrared receiving tube D1, and filters out a direct current signal (ambient light interference signal) in the input pulse signal (i.e., the voltage signal on the R2), so as to avoid the interference of infrared rays in ambient light.
The filter circuit 11 inputs the filtered pulse signal to the voltage comparison circuit 12, and the voltage comparison circuit 12 outputs the pulse signal with the same frequency when the amplitude of the input pulse signal reaches a set amplitude threshold value, so that the infrared detection is realized according to the output pulse signal.
According to the infrared detection device provided by the embodiment of the invention, the control electrode of the driving tube is used for inputting a pulse control signal, when the driving tube is switched on, the infrared emission tube emits infrared rays, and when the driving tube is switched off, the infrared emission tube stops emitting the infrared rays, so that the infrared detection device works in a pulse mode with low duty ratio, the energy consumption can be reduced, and the working time of the infrared detection device on battery equipment is increased; the filter circuit can filter out direct current signals generated by ambient light interference, can avoid interference of infrared rays in ambient light, and can still normally work under the condition of strong outdoor light.
Further, as shown in fig. 3, fig. 3 is a circuit diagram of an infrared detection apparatus according to an embodiment of the present invention, and the filter circuit 11 in the embodiment shown in fig. 2 may specifically include:
a first capacitor C5, wherein a first end of the first capacitor C5 is connected with the second pole of the infrared receiving tube D1, and a second end of the first capacitor C5 is connected with the voltage comparison circuit 12;
and a first end of the third resistor R8, a first end of the third resistor R8 is connected with a second end of the first capacitor C5, and a second end of the third resistor R8 is grounded.
In the embodiment of the present invention, the filter circuit 11 may be a high-pass filter formed by a first capacitor C5 and a third resistor R8, and is configured to filter a direct current signal in the pulse signal.
Further, as shown in fig. 3, the voltage comparison circuit 12 in the embodiment shown in fig. 2 may specifically include:
and the positive input end of the comparator U1C, the positive input end of the comparator U1C is connected with the filter circuit 12, the negative input end of the comparator U1C is used for inputting a set amplitude threshold value, and the output end of the comparator is connected with the signal output end signal out of the infrared detection device.
In the embodiment of the present invention, as shown in fig. 3, the voltage comparison circuit 12 may further include a capacitor C18, and resistors R9 and R12.
Further, as shown in fig. 3, based on the embodiment shown in fig. 2, the infrared detection device may further include:
the voltage follower circuit 13 is connected to the filter circuit 11 through the voltage follower circuit 13, and the second pole of the infrared receiver D1 is used for buffering the input pulse signal by the voltage follower circuit 13.
Specifically, as shown in fig. 3, the voltage follower circuit 13 may include:
the positive input terminal of the first operational amplifier U1A, the first operational amplifier U1A is connected to the second terminal of the ir receiver D1, and the negative input terminal of the first operational amplifier U1A is connected to the output terminal of the first operational amplifier U1A and the filter circuit 11.
Further, as shown in fig. 3, based on the embodiment shown in fig. 2, the infrared detection device may further include:
the in-phase amplifier circuit 14, the filter circuit 11 is connected to the voltage comparator circuit 12 through the in-phase amplifier circuit 14, and the in-phase amplifier circuit 14 is configured to perform amplitude amplification processing on an input pulse signal.
Specifically, as shown in fig. 3, the equidirectional amplification circuit 14 may include:
a fourth resistor R7;
a fifth resistor R10;
a sixth resistor R11;
in the second operational amplifier U1B, the positive input terminal of the second operational amplifier U1B is connected to the filter circuit 11 through a fourth resistor R7, the negative input terminal of the second operational amplifier U1B is grounded through a fifth resistor R10, the negative input terminal of the second operational amplifier U1B is connected to the output terminal of the second operational amplifier U1B through a sixth resistor R11, and the output terminal of the second operational amplifier U1B is connected to the voltage comparator circuit 12.
Further, as shown in fig. 3, based on the embodiment shown in fig. 2, the infrared detection device may further include:
the voltage stabilizing circuit 15 and the voltage comparing circuit 12 are connected with a signal output end signal out of the infrared detection device through the voltage stabilizing circuit 15, and the voltage stabilizing circuit 15 is used for performing voltage stabilizing processing on an input pulse signal and eliminating jitter.
Specifically, as shown in fig. 3, the voltage stabilizing circuit 15 may include: a schmitt trigger.
In the embodiment of the present invention, when the object to be measured is exactly near the flip threshold of the comparator U1C in the voltage comparing circuit 12, the comparator U1C may output a large amount of dither signals, and the voltage stabilizing circuit 15 may eliminate the dither and prevent misjudgment.
The working principle of the infrared detection device of the embodiment of the invention is as follows:
the control electrode of the driving tube Q1 inputs a pulse control signal, so that a voltage signal is generated on the second resistor R2, the voltage signal is a pulse signal (useful signal) superimposed on a direct current signal (ambient light interference signal), the voltage follower circuit 13 buffers the signal, the filter circuit 11 filters the direct current signal in the buffered signal, the equidirectional amplifier circuit 14 performs amplitude amplification processing on the filtered signal, the voltage comparator circuit 12 outputs the pulse signal with the same frequency when the amplitude of the input amplified pulse signal reaches a set amplitude threshold value, the jitter is eliminated through the voltage regulator circuit 15, and the pulse signal is output to a signal output end signal out of the infrared detection device, so that infrared detection is realized.
According to the infrared detection device provided by the embodiment of the invention, the control electrode of the driving tube is used for inputting a pulse control signal, when the driving tube is switched on, the infrared emission tube emits infrared rays, and when the driving tube is switched off, the infrared emission tube stops emitting the infrared rays, so that the infrared detection device works in a pulse mode with low duty ratio, the energy consumption can be reduced, and the working time of the infrared detection device on battery equipment is increased; the filter circuit can filter out direct current signals generated by ambient light interference, can avoid interference of infrared rays in ambient light, and can still normally work under the condition of strong outdoor light.
In order to implement the above embodiment, an infrared photoelectric sensor 20 is further provided in an embodiment of the present invention, as shown in fig. 4, including an infrared detection device 21 as shown in the above embodiment; the controller is connected to a signal output terminal signal out of the infrared detection device 21 for determining whether an object is detected according to the input pulse signal.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. An infrared detection device, comprising:
a first resistor;
the anode of the infrared emission tube is connected with a first direct current power supply through the first resistor;
the first pole of the driving tube is connected with the cathode of the infrared emission tube, the second pole of the driving tube is grounded, and the control pole of the driving tube is used for inputting a pulse control signal;
a second resistor;
the first pole of the infrared receiving tube is connected with the first direct current power supply, and the second pole of the infrared receiving tube is grounded through the second resistor;
the filter circuit is connected with the second pole of the infrared receiving tube and is used for filtering out direct current signals in the input pulse signals;
the voltage comparison circuit is respectively connected with the filter circuit and the signal output end of the infrared detection device, and is used for outputting pulse signals with the same frequency when the amplitude of the input pulse signals reaches a set amplitude threshold value;
the filter circuit includes:
a first end of the first capacitor is connected with the second pole of the infrared receiving tube, and a second end of the first capacitor is connected with the voltage comparison circuit;
a first end of the third resistor is connected with the second end of the first capacitor, and a second end of the third resistor is grounded;
the voltage comparison circuit includes:
and the positive input end of the comparator is connected with the filter circuit, the negative input end of the comparator is used for inputting the set amplitude threshold value, and the output end of the comparator is connected with the signal output end of the infrared detection device.
2. The infrared detection device as set forth in claim 1, further comprising:
and the second pole of the infrared receiving tube is connected with the filter circuit through the voltage follower circuit, and the voltage follower circuit is used for buffering an input pulse signal.
3. The infrared detection device as claimed in claim 2, wherein the voltage follower circuit comprises:
and the positive input end of the first operational amplifier is connected with the second pole of the infrared receiving tube, and the negative input end of the first operational amplifier is respectively connected with the output end of the first operational amplifier and the filter circuit.
4. The infrared detection device as set forth in claim 1, further comprising:
the filter circuit is connected with the voltage comparison circuit through the in-phase amplification circuit, and the in-phase amplification circuit is used for carrying out amplitude amplification processing on an input pulse signal.
5. The infrared detection device as set forth in claim 4, wherein the in-phase amplification circuit includes:
a fourth resistor;
a fifth resistor;
a sixth resistor;
and the input positive end of the second operational amplifier is connected with the filter circuit through the fourth resistor, the input negative end of the second operational amplifier is grounded through the fifth resistor, the input negative end of the second operational amplifier is connected with the output end of the second operational amplifier through the sixth resistor, and the output end of the second operational amplifier is connected with the voltage comparison circuit.
6. The infrared detection device as set forth in claim 1, further comprising:
and the voltage stabilizing circuit is connected with the signal output end of the infrared detection device through the voltage stabilizing circuit and is used for carrying out voltage stabilizing treatment on the input pulse signal and eliminating jitter.
7. The infrared detection device as claimed in claim 6, wherein the voltage stabilizing circuit comprises: a schmitt trigger.
8. An infrared photoelectric sensor, comprising: a controller and an infrared detection device as claimed in any one of claims 1 to 7;
the controller is connected with the signal output end of the infrared detection device and used for determining whether an object is detected according to the input pulse signal.
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| CN110976061A (en) * | 2019-12-19 | 2020-04-10 | 常州市浦西尔电子有限公司 | Paper full detection circuit and method capable of distinguishing infrared rays |
| CN111204628B (en) * | 2020-02-27 | 2022-10-14 | 陕西科技大学 | Intelligent elevator safety key input device and method for preventing and controlling virus infection |
| CN113859314B (en) * | 2020-06-30 | 2023-10-13 | 比亚迪股份有限公司 | Rail occupation detection device, detection method and rail transit system |
| CN113497616A (en) * | 2021-06-10 | 2021-10-12 | 佛山普瑞威尔科技有限公司 | Infrared induction control circuit and liquid outlet device |
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