CN111413746A - Detection sensor - Google Patents
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- CN111413746A CN111413746A CN202010225100.XA CN202010225100A CN111413746A CN 111413746 A CN111413746 A CN 111413746A CN 202010225100 A CN202010225100 A CN 202010225100A CN 111413746 A CN111413746 A CN 111413746A
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- 238000001514 detection method Methods 0.000 title claims abstract description 77
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- 239000000203 mixture Substances 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
- G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
- G01S7/2928—Random or non-synchronous interference pulse cancellers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
Abstract
The invention discloses a detection sensor which comprises an object sensing circuit module, a human body sensing circuit module and an output module. The object sensing circuit module is connected with the output module, and is configured to receive and process a sensing signal of an object located in the detection area, and transmit the processed sensing signal to the output module. The human body induction circuit module is connected with the output module, is configured to receive and process induction signals of a human body located in the detection area, and transmits the processed induction signals to the output module. And the output module is configured to receive and output signals transmitted by the object sensing circuit module and the human body sensing circuit module. The detection sensor has strong functions and wide application range, can detect moving objects by using the Doppler radar principle, and can also detect human bodies by using the infrared induction principle.
Description
Technical Field
The present invention relates generally to the field of signal detection. More particularly, the present invention relates to a detection sensor.
Background
Limit sensors used in mines and other environments generally include on-off limit sensors, infrared diffuse reflection sensors, or linear sensors. While these sensors are able to meet basic limit requirements, problems still exist. For example, a sensor of the optical line type is easily shielded by dust, smoke, or an obstacle, and a contact of a contact sensor is easily worn and aged.
Secondly, the existing sensor also has the defects of low detection sensitivity, small detection area, poor anti-interference capability and the like. In addition, in some application fields related to personal safety, the detected object and the human body need to be identified, and the existing sensor has single function and cannot detect the object and the human body simultaneously.
Disclosure of Invention
To solve one or more of the above-mentioned problems of the background art, the present invention provides a sensor capable of simultaneously detecting an object and a human body. The sensor of the invention utilizes the Doppler radar principle to detect the microwave of the moving object and simultaneously utilizes the pyroelectric technology to detect and identify the human body. The sensor of the invention adopts a surface type covering design, does not need to be contacted with a detection object, and is not influenced by severe environments such as smoke and the like, thereby overcoming a plurality of defects of the traditional sensor.
The invention discloses a detection sensor, which comprises an object sensing circuit module, a human body sensing circuit module and an output module; the object sensing circuit module is connected with the output module, is configured to receive and process sensing signals of an object located in the detection area, and transmits the processed sensing signals to the output module; the human body induction circuit module is connected with the output module, is configured to receive and process induction signals of a human body in the detection area, and transmits the processed induction signals to the output module; and the output module is configured to receive and output signals transmitted by the object sensing circuit module and the human body sensing circuit module.
In one embodiment, the detection sensor of the present invention further comprises a power circuit module, which is respectively connected to the object sensing circuit module and the human body sensing circuit module, and is configured to convert an external voltage into a voltage suitable for the object sensing circuit module and the human body sensing circuit module.
In one embodiment, the object sensing circuit module includes a radar sensing module configured to transmit and receive microwave signals reflected by a moving object and transmit pulse signals processed by the radar sensing module to the output module.
In another embodiment, the object sensing circuit module further includes a signal amplification module, and the signal amplification module is connected to the radar sensing module and configured to amplify the signal output by the radar sensing module.
In another embodiment, the signal amplification module comprises a first filter circuit and a first operational amplifier circuit, wherein the first filter circuit is used for filtering noise signals generated by the radar sensing module; and the first operational amplifier circuit is connected with the first filter circuit and is used for amplifying the signal processed by the first filter circuit.
In an embodiment, the object sensing circuit module further includes a voltage comparison module, where the voltage comparison module is respectively connected to the signal amplification module and the output module, and configured to perform voltage comparison determination on the signal output by the signal amplification module and transmit a result of the comparison determination to the output module.
In another embodiment, the voltage comparison module comprises a second filter circuit and a second operational amplifier circuit, wherein the second filter circuit is used for filtering noise signals generated by the radar sensing module and the signal amplification module; and the second operational amplifier circuit is connected with the second filter circuit and is used for comparing and judging the pulse signals processed by the second filter circuit.
In one embodiment, the human body sensing circuit module includes an infrared sensing module configured to detect and receive an infrared signal transmitted from a human body, and transmit an electrical signal processed thereby to the output module.
In another embodiment, the detection sensor further includes a power dividing module, where the voltage dividing module is respectively connected to the power circuit module, the signal amplifying module, and the voltage comparing module, and configured to convert the voltage signal output by the power circuit module and provide a working voltage to the signal amplifying module and the voltage comparing module.
In yet another embodiment, the detection sensor further comprises an indicating device coupled to the power circuit module and configured to emit an indicating signal when the sensor senses an object.
The detection sensor of the invention detects moving objects by utilizing the microwave radar principle and the human body pyroelectric principle, can be applied to detection equipment with various functions, and is used for realizing the functions of object limiting, person identification and the like. The sensor can be applied to various scenes such as mines and the like, and has the advantages of strong anti-interference capability, high detection sensitivity, flexible and reliable use and the like.
Drawings
The above-described features of the present invention will be better understood and its numerous objects, features, and advantages will be apparent to those skilled in the art by reading the following detailed description with reference to the accompanying drawings. The drawings in the following description are only some embodiments of the invention and other drawings may be derived by those skilled in the art without inventive effort, wherein:
FIG. 1 is a schematic diagram showing the composition of a detection sensor according to an embodiment of the present invention;
FIG. 2 is a block diagram showing the components of a detection sensor according to an embodiment of the present invention;
FIG. 3 is a circuit schematic illustrating a detection sensor according to an embodiment of the present invention; and
fig. 4 is a schematic view showing an application of a detection sensor according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram showing the composition of a detection sensor 100 according to an embodiment of the present invention.
As shown in fig. 1, the detection sensor of the present invention includes an object sensing circuit module 101, an output module 102, and a human body sensing circuit module 103. The object sensing circuit module is connected with the output module, and is configured to receive and process a sensing signal of an object located in the detection area, and transmit the processed sensing signal to the output module. The human body induction circuit module is connected with the output module, is configured to receive and process induction signals of a human body located in the detection area, and transmits the processed induction signals to the output module. The output module is configured to receive and output signals transmitted by the object sensing circuit module and the human body sensing circuit module.
In one embodiment, the output module may be an interface circuit module. The human body induction circuit module is connected with the output ends of the object induction circuit module and the human body induction circuit module respectively, and provides a communication interface for an external application system so as to output electric signals transmitted by the object induction circuit module and the human body induction circuit module.
Fig. 2 is a block diagram showing the components of a detection sensor 200 according to an embodiment of the present invention. It should be noted here that the detection sensor 200 in fig. 2 can be understood as an exemplary implementation of the detection sensor 100 in fig. 1. Therefore, the details of the detection sensor 100 described in connection with fig. 1 are also applicable to the description of the detection sensor 200. The composition and operation of the detection sensor of the present invention will be described with reference to fig. 2.
As shown in fig. 2, the detection sensor 200 includes a power circuit module 201, an infrared sensing module 202, a radar sensing module 203, a signal amplifying module 204, a voltage comparing module 205, a power dividing module 206, and an interface circuit module 207.
In the illustrated block diagram, the power circuit module is configured to provide power to the infrared sensing module, the radar sensing module, and the power dividing module. The infrared sensing module is configured to receive, process and send sensing signals of a human body. The radar sensing module is configured to receive, process and transmit a sensing signal of a moving object. The signal amplification module is configured to amplify the signal transmitted by the radar sensing module and output the amplified signal to the voltage comparison module. And the voltage comparison module is configured to perform voltage comparison judgment on the signal output by the signal amplification module. The power supply voltage division module is configured to provide power to the signal amplification module and the voltage comparison module. The interface circuit module is configured to receive the signals output by the infrared sensing module and the voltage comparison module and transmit the signals to the outside of the system.
In one embodiment, the object sensing circuit module may include a radar sensing module. When the radar sensing module is powered on to work, the radar sensing module can send microwave signals to a certain specified direction through the antenna. When the microwave signal contacts a moving object (including a human body), the microwave signal is reflected back by the moving object and is received and processed by the radar sensing module. And then the radar sensing module outputs the processed pulse signal to the signal amplification module.
In another embodiment, the object sensing circuit module may further include a signal amplification module configured to amplify the weak pulse signal output by the radar sensing module for subsequent processing. The signal amplifying module may have various implementations, and for example, may be a circuit module at least composed of a filter circuit and an operational amplifier circuit. The filter circuit is used for filtering noise signals generated by the radar sensing module and other circuits related to the radar sensing module; the operational amplifier circuit is used for amplifying the signal processed by the filter circuit.
Here, the present invention is to be distinguished from a filter circuit and an operational amplifier circuit in a voltage comparison module, which will be described later. Defining a filter circuit and an operational amplifier circuit in the signal amplification module as a first filter circuit and a first operational amplifier circuit; and the filter circuit and the operational amplifier circuit in the voltage comparison module are defined as a second filter circuit and a second operational amplifier circuit. In addition, the first operational amplifier circuit and the second operational amplifier circuit may implement the same or different functions according to different implementations and application scenarios.
In one embodiment, the object sensing circuit module may further include a voltage comparison module. And the voltage comparison module is respectively connected with the signal amplification module and the interface circuit module. In one operation scenario, when the pulse signal processed by the signal amplification module is transmitted to the voltage comparison module, the voltage comparison module compares the voltage value of the pulse signal with a voltage reference value, so that the irregular pulse signal can be converted into a regular pulse signal, for example, a rectangular pulse signal. Then, the voltage comparison module sends the converted pulse signal to the interface circuit module.
In one embodiment, the voltage comparison module may have various implementations, and may be a circuit module including at least a second filter circuit and a second operational amplifier circuit. The second filter circuit can be used for filtering noise signals generated by the radar sensing module, the signal amplification module and other circuits related to the radar sensing module and the signal amplification module. Correspondingly, the second operational amplifier circuit may be configured to compare and decide the amplitude of the signal processed by the second filter circuit with a reference value, and finally output a result of the comparison and decision to the interface circuit module.
In one embodiment, the human body sensing circuit module may include an infrared sensing module and an auxiliary circuit thereof. In operation, when a human body is in the detection area, the infrared sensing module can detect an infrared signal sent by the human body and process the signal through the auxiliary circuit, so that the signal is converted into a high-level or low-level direct current signal and is transmitted to the interface circuit module.
In another embodiment, the detection sensor of the present invention may further comprise a power circuit module configured to convert an external voltage into a voltage suitable for use by the modules in the sensor of the present invention. Alternatively, the sensor of the present invention may also be directly powered by a dc power source or a battery without including a power circuit module.
In another embodiment, the detection sensor of the present invention may further include a power dividing module. The voltage division module is respectively connected with the power circuit module, the signal amplification module and the voltage comparison module. In operation, the power supply voltage dividing module may be configured to divide and convert the voltage signal output by the power supply circuit module and provide the operating voltage to the signal amplifying module and the voltage comparing module.
Fig. 3 is a schematic circuit diagram illustrating a detection sensor 300 according to an embodiment of the present invention. It is noted here that the detection sensor 300 shown in fig. 3 is an exemplary circuit implementation of the detection sensor 200 shown in fig. 2. Therefore, the above description of the detection sensor 200 shown in fig. 2 is also applicable to the detection sensor 300 shown in fig. 3. The composition and operation of the detection sensor of the present invention will be described in detail with reference to fig. 3.
As shown in fig. 3, the detection sensor 300 of the present invention includes a power circuit module 301, a pyroelectric module 302, an interface circuit module 303, a radar sensing module 304, a signal amplification module 305, a voltage comparison module 306, a power voltage division module 307, and an indication device 308.
In one embodiment, the power circuit module of the sensor of the invention may include a filter circuit, a voltage conversion chip, a voltage stabilizing circuit, an anti-surge protection circuit, and the like. The operation principle of the power circuit module will be briefly described below by taking the circuit in fig. 3 as an example.
First, after a 12V voltage signal provided by an external power source is regulated by a zener diode D25, a filter circuit composed of R86, C53 and C55 filters the voltage signal to filter noise and noise signals. Then, the 12V voltage signal processed by the filter circuit is stepped down by the voltage conversion chip, and a 5V voltage signal is sent from the output port 3 thereof. As a specific implementation mode, the model of the voltage conversion chip can be HT7133-1, for example. Preferably, the model thereof may also be HT 7150-1. Then, the 5V voltage signal output from the port 3 is filtered by a filter circuit composed of C52, C54, and C56, and after noise is removed, it is output to a pyroelectric module, a radar sensing module, a power supply voltage dividing module, an indicating device, and the like.
In another embodiment, the infrared sensing module may be a pyroelectric module. Specifically, the pyroelectric module may include a pyroelectric infrared sensor, which may be composed of a sensing detection element, an interference filter, and a field effect transistor matcher. In one embodiment, the pyroelectric infrared sensor may include two detection elements, and the two detection elements are connected in series with reversed polarity to suppress interference due to a temperature rise of the two detection elements. Preferably, the model of the pyroelectric infrared sensor can be RD-624. The working principle of the pyroelectric infrared sensor is briefly explained below
The central wavelength of infrared rays radiated by a human body is 9-10 mu m, and the wavelength sensitivity of the detection element is almost stable and unchanged within the range of 0.2-20 mu m. The top of the sensor can be opened with a window with a filter lens, the filter can pass light with a wavelength range of 7-10 μm, and infrared rays with other wavelengths are absorbed by the filter. When a human body approaches to the pyroelectric infrared sensor, the infrared radiation signal detected and received by the detection element is converted into a weak voltage signal, and the weak voltage signal is amplified by the field effect tube arranged in the probe and then is output to the second port of the interface circuit module.
In one embodiment, the object sensing module may comprise a radar sensing module. The radar sensing module operates using the doppler radar principle. When the radio wave emitted by the radar sensing module encounters an object during traveling, the radio wave is reflected, and the frequency of the reflected wave changes with the moving state of the object. For example, if the location of the object that the radio waves encounter is fixed, then the frequency of the reflected wave and the frequency of the transmitted wave should be equal. If the object moves in the direction of the radio wave emission, the radio wave reflected back will be compressed, i.e. the frequency of the reflected wave will increase; whereas the frequency of the radio waves reflected back is reduced.
As a specific embodiment, the model number of the radar sensing module of the present invention may adopt HB 100. The microwave signal is transmitted and collected through the antenna surface, and the processed microwave signal is output through the IF port. The frequency of the output signal of the IF port is related to the state of movement of the object, while the amplitude of the output signal is related to the size and distance of the object.
The first filter circuit may be an RC filter circuit configured to filter a signal input by the radar sensing module to remove noise interference and output a filtered pulse signal to a non-inverting terminal 3 of the first operational amplifier, and the first operational amplifier circuit may be composed of the first operational amplifier and an auxiliary circuit configured to amplify the signal filtered by the first filter circuit.
The second filter circuit may be an RC filter circuit configured to filter the pulse signal output by the signal amplification module to remove noise interference and output the filtered pulse signal to an inverting terminal 6 of a second operational amplifier.
When the second operational amplifier works, the voltage value of the pulse signal input by the inverting terminal is compared and judged with the reference voltage value input by the non-inverting terminal 5 according to a certain rule, and finally, a direct current pulse signal (such as a rectangular pulse signal) is output to the third port of the interface circuit module. In one embodiment, the comparison and decision rule adopted by the second operational amplifier may be: when the voltage value input by the inverting terminal is larger than the voltage value input by the non-inverting terminal, the output is a direct current positive level; when the voltage value input by the inverting terminal is smaller than the voltage value input by the non-inverting terminal, the output is zero.
In one embodiment, the detection sensor of the present invention may further include a power dividing module composed of a resistor and a capacitor, and configured to divide the voltage output by the power circuit module so as to provide operating power to the signal amplifying module and the voltage comparing module. In one embodiment, the voltage VCC is divided by the resistors R88 and R90, and then the divided voltage value is applied to the non-inverting terminal of the second operational amplifier, which is used as a reference voltage for the comparison decision of the voltage comparison module. In another embodiment, the voltage VCC is divided by a circuit composed of resistors R87, R89, R91 and a capacitor C57, and then the divided voltage value is applied to the non-inverting terminal of the first operational amplifier.
In one embodiment, the detection sensor of the present invention may further include an interface circuit module. The first port of the interface circuit module is connected with a working power supply; the second port is connected with the output end of the pyroelectric module; the third port is connected with the output port 7 of the voltage comparison module; the fourth port is grounded. The pyroelectric infrared sensor is configured to receive electric signals output by the radar sensing module and the pyroelectric infrared sensor and can send the electric signals to an external application system so as to perform subsequent processing on the signals and further realize various functions of the external application system.
As a specific embodiment, the indicating device can be a light emitting diode ("L ED"). one end of the L ED is connected with the output end VCC of the power circuit through a resistor R92, and the other end is grounded through a capacitor C69. in one embodiment, the L ED is lighted to emit light when the object sensing module or the human sensing module outputs a high level.
The working principle of the detection sensor of the present invention is further explained in conjunction with fig. 3.
The detection sensor comprises a power supply circuit module, a pyroelectric module (RD-624), a radar sensing module (HB100), a power supply voltage division module and an indicating device (L ED), wherein the power supply circuit module is used for supplying power to all modules in the detection sensor, the voltage of 12V input from the outside is reduced by the power supply circuit module, and 5V voltage is transmitted to the pyroelectric module (RD-624), the radar sensing module (HB100), the power supply voltage division module and the indicating device (L ED) so that the modules and the devices are in working states.
When a moving object (including a human body) moves into a detection area of the detection sensor, the moving object receives and reflects a microwave signal sent by the radar sensing module. The reflected signal is processed by the radar sensing module, converted into an electric pulse signal and output through the IF port. Then, the electric pulse signal passes through the blocking capacitor C58 and the resistor R95 to reach the first filter circuit for noise filtering processing. Then, the electric pulse signal enters the non-inverting terminal of the first operational amplifier, is subjected to negative feedback amplification and then is output to the voltage comparison module.
At the voltage comparison module, the pulse signal firstly passes through the second filter circuit to filter noise, then enters the inverting terminal of the second operational amplifier and is compared with the reference voltage value at the non-inverting terminal, finally, a rectangular pulse signal is sent from the output port 7 of the second operational amplifier to the third port of the interface circuit module, and meanwhile, when the rectangular pulse signal passes through L ED, the rectangular pulse signal is applied to the input port of L ED along with the high and low levels, L ED starts to flash, and therefore the moving object enters the detection area.
When a human body moves into the detection area of the detection sensor, the human body can send out an infrared signal, and the infrared signal is received and processed by the pyroelectric module. And then, sending the processed high-level direct current signal to a second port of the interface circuit module. Further, after receiving the signals sent by the radar sensing module and the pyroelectric module, the interface circuit module may send the signals to an external application system so as to perform subsequent processing on the signals, thereby implementing various functions of the external application system.
Fig. 4 is a schematic view showing an application of a detection sensor according to an embodiment of the present invention. As shown in fig. 4, in an underground place such as a mine, the detection sensor of the present invention is disposed in an area to be detected. When the moving object moves into the sensing area or moves in the sensing area, the sensor can detect the object; when a moving object meets the obstacle to block (the obstacle shown in fig. 4 can be in any other shape), the detection sensor of the present invention can still normally detect as long as the object is in the sensing area at this time.
It should be understood that the terms "first", "second", "third" and "fourth", etc. in the claims, the description and the drawings of the present invention are used for distinguishing different objects and are not used for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and claims of this application, the singular form of "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and claims of this specification refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
As used in this specification and claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Although the embodiments of the present invention are described above, the descriptions are only examples for facilitating understanding of the present invention, and are not intended to limit the scope and application scenarios of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A detection sensor comprises an object sensing circuit module, a human body sensing circuit module and an output module; wherein
The object sensing circuit module is connected with the output module, is configured to receive and process sensing signals of an object located in the detection area, and transmits the processed sensing signals to the output module;
the human body induction circuit module is connected with the output module, is configured to receive and process induction signals of a human body in the detection area, and transmits the processed induction signals to the output module; and
the output module is configured to receive and output signals transmitted by the object sensing circuit module and the human body sensing circuit module.
2. The detection sensor of claim 1, further comprising a power circuit module, respectively connected to the object sensing circuit module and the human body sensing circuit module, configured to convert an external voltage into a voltage suitable for use by the object sensing circuit module and the human body sensing circuit module.
3. The detection sensor of claim 2, wherein the object sensing circuit module comprises a radar sensing module configured to transmit and receive microwave signals reflected back from a moving object and to transmit pulse signals processed thereby to the output module.
4. The detection sensor of claim 3, wherein the object sensing circuit module further comprises a signal amplification module, the signal amplification module is connected to the radar sensing module and configured to amplify the signal output by the radar sensing module.
5. The detection sensor of claim 4, wherein the signal amplification module comprises a first filter circuit and a first operational amplifier circuit, wherein
The first filter circuit is used for filtering noise signals generated by the radar sensing module; and
the first operational amplifier circuit is connected with the first filter circuit and is used for amplifying the signal processed by the first filter circuit.
6. The detection sensor according to claim 3, wherein the object sensing circuit module further comprises a voltage comparison module, the voltage comparison module is respectively connected to the signal amplification module and the output module, and is configured to perform a voltage comparison decision on the signal output by the signal amplification module, and transmit a result of the comparison decision to the output module.
7. The detection sensor of claim 6, wherein the voltage comparison module comprises a second filter circuit and a second operational amplifier circuit, wherein
The second filter circuit is used for filtering noise signals generated by the radar sensing module and the signal amplification module; and
and the second operational amplifier circuit is connected with the second filter circuit and is used for comparing and judging the pulse signals processed by the second filter circuit.
8. The detection sensor of claim 1, wherein the human body sensing circuit module comprises an infrared sensing module configured to detect and receive an infrared signal transmitted from a human body, and transmit an electrical signal processed thereby to the output module.
9. The detection sensor according to claim 1, further comprising a power dividing module, wherein the voltage dividing module is respectively connected to the power circuit module, the signal amplifying module and the voltage comparing module, and is configured to convert the voltage signal output by the power circuit module and provide an operating voltage to the signal amplifying module and the voltage comparing module.
10. The detection sensor of any one of claims 1 to 9, further comprising an indication device coupled to the power circuit module and configured to emit an indication signal when the sensor detects an object.
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| WO2017222245A1 (en) * | 2016-06-21 | 2017-12-28 | 씨아이에스포유 주식회사 | Human body detection sensor using doppler radar |
| US20180130323A1 (en) * | 2016-11-08 | 2018-05-10 | Tianjin Hualai Technology Co., Ltd. | Surveillance camera |
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Application publication date: 20200714 |