CN217442581U - Photoelectric correlation sensor circuit and photoelectric correlation sensor - Google Patents
Photoelectric correlation sensor circuit and photoelectric correlation sensor Download PDFInfo
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- CN217442581U CN217442581U CN202220510418.7U CN202220510418U CN217442581U CN 217442581 U CN217442581 U CN 217442581U CN 202220510418 U CN202220510418 U CN 202220510418U CN 217442581 U CN217442581 U CN 217442581U
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Abstract
The application discloses photoelectric correlation sensor circuit and photoelectric correlation sensor. The photoelectric correlation sensor circuit comprises a light-emitting end module and a receiving end module, wherein the light-emitting end module can emit light rays, and the emitted light rays are received by the receiving end module; the receiving end module includes: the triode, the light receiving unit and the base voltage regulating unit; the base voltage adjusting unit is connected with the base of the triode and can adjust the base voltage of the triode; one end of the light receiving unit is connected with the base electrode of the triode, and the other end of the light receiving unit is connected with the collector electrode of the triode. The embodiment of the application provides a photoelectric correlation sensor circuit and a photoelectric correlation sensor capable of detecting fine position changes of an object.
Description
Technical Field
The application relates to the technical field of sensors, in particular to a photoelectric correlation sensor circuit and a photoelectric correlation sensor.
Background
The photoelectric correlation sensor is a sensor for detecting whether an object moves, and the detection principle is to convert an optical signal into an electrical signal to realize detection. One side of the photoelectric correlation sensor emits light, the other side receives light, and the detected object is placed between the light emitting side and the light receiving side. When the object is still between the light emitting side and the light receiving side, the detected object can block the light of the light emitting side, so that the light receiving side cannot receive the light emitted by the light emitting side. When the object moves, the light receiving side receives light, which indicates that the object to be detected moves.
In the related art, when the position of the object to be detected slightly changes, the response speed of the output signal of the general correlation type photoelectric sensor is slow, and high/low level frequent jitter occurs at a critical point, so that the slight position change of the object to be detected cannot be judged.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem, the present application provides a photo-electric correlation sensor circuit and a photo-electric correlation sensor capable of detecting a fine position change of an object.
To achieve the purpose, the embodiment of the application adopts the following technical scheme:
a photoelectric correlation sensor circuit comprises a light-emitting end module and a receiving end module, wherein the light-emitting end module can emit light rays, and the emitted light rays are received by the receiving end module; the receiving end module includes: the triode, the light receiving unit and the base voltage regulating unit; the base voltage adjusting unit is connected with the base of the triode and can adjust the base voltage of the triode; one end of the light receiving unit is connected with the base electrode of the triode, and the other end of the light receiving unit is connected with the collector electrode of the triode.
As an alternative to the above-mentioned photoelectric correlation sensor circuit, the base voltage adjusting unit is a first resistor or an adjustable regulated power supply.
As an alternative to the above-mentioned optical-electrical correlation sensor circuit, when the base voltage adjustment unit is a first resistor, the first resistor is an adjustable resistor.
As an alternative of the above-mentioned photoelectric correlation sensor circuit, when the base voltage adjustment unit is a first resistor, one end of the first resistor is connected to the emitter of the triode, and the other end of the first resistor is connected to the base of the triode.
As an alternative of the above-mentioned photoelectric correlation sensor circuit, when the base voltage adjusting unit is an adjustable regulated power supply, the OUT pin of the adjustable regulated power supply is connected to the base of the triode.
As an alternative to the above-mentioned optical-electrical correlation sensor circuit, the light receiving unit is a photosensitive receiving diode, a negative electrode of the photosensitive receiving diode is connected to the base of the triode, and a positive electrode of the photosensitive receiving diode is connected to the collector of the triode.
As an alternative to the above-mentioned photoelectric correlation sensor circuit, the receiving end module further includes an optical coupler; the input end of the optical coupler is connected with the emitting electrode of the triode, and the output end of the optical coupler is connected with a PLC (Programmable Logic Controller) Controller.
As an alternative of the above-mentioned photoelectric correlation sensor circuit, the receiving end module further includes a second resistor, one end of the second resistor is connected to the power supply voltage VCC, and the other end of the second resistor is connected to the input end of the optocoupler.
As an alternative to the above-mentioned photoelectric correlation sensor circuit, the light emitting terminal module includes: a third resistor and a light emitting diode; one end of the third resistor is connected with a power supply voltage VCC, the other end of the third resistor is connected with one end of the light-emitting diode, and the other end of the light-emitting diode is grounded.
The utility model provides a photoelectric correlation sensor, includes as above photoelectric correlation sensor circuit, still includes relative first fixing base and the second fixing base that sets up, the light emitting component of luminous end module is located on the first fixing base, the light receiving element of light receiving unit locates on the second fixing base.
The embodiment of the application has the advantages that: the base voltage adjusting unit is arranged and connected with the base of the triode, the base voltage of the triode can be adjusted, the base voltage is adjusted to a critical point of cut-off and conduction of the triode, when the detected object slightly moves, namely the light receiving unit receives any point of light emitted by the light emitting end module, the internal resistance value of the light receiving unit is reduced, and the triode can be conducted due to the fact that the base voltage of the triode is at the critical point. That is, the photoelectric correlation sensor circuit of the present application can detect any slight positional change of the detected object, even the positional change of the object of even 0.1 mm. The positional change includes a change in height as well as a change in position in other directions.
Drawings
FIG. 1 is a schematic diagram of a circuit of an optical-electrical correlation sensor according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a circuit of an optoelectronic correlation sensor according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an embodiment of a circuit of an optical-electrical correlation sensor;
fig. 4 is a schematic structural diagram of an optical-electrical correlation sensor according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
In the description of the present application, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
The technical scheme of the application is further explained by the specific implementation mode in combination with the attached drawings.
The embodiment of the application provides a photoelectric correlation sensor circuit. Referring to fig. 1 to 3, the optical-electrical correlation sensor circuit includes a light-emitting end module 100 and a receiving end module 200, wherein the light-emitting end module 100 can emit light after being powered on. The light emitted from the light-emitting end module 100 is received by the receiving end module 200. During detection, an object to be detected is placed between the light-emitting end module 100 and the receiving end module 200, light emitted by the light-emitting end module 100 is blocked, and the receiving end module 200 cannot receive the light emitted by the light-emitting end module 100; after the detected object moves, the detected object cannot block the light emitted from the light-emitting end module 100, so that part or all of the light irradiates the receiving end module 200, and the receiving end module 200 detects the light emitted from the light-emitting end module 100, thereby determining that the detected object moves. The movement of the detected object may be a change in height, a change in position in the horizontal direction, or a change in position in another direction. The light-emitting terminal module 100 and the receiving terminal module 200 may be arranged at intervals in a direction perpendicular to the detection direction, as needed.
Referring to fig. 1 to fig. 3, in the present application, the receiving end module 200 includes a transistor Q, a light receiving unit 210 and a base voltage adjusting unit 220. The triode Q can adopt a PNP type triode, and the type can be 2 TY. The triode Q comprises an emitter, a collector and a base. The base voltage adjusting unit 220 is connected to the base of the transistor Q, and the emitter of the transistor Q may be connected to the power supply voltage VCC, where the connection to the power supply voltage VCC may refer to connection through an intermediate element, for example, as shown in fig. 1 to 3, and the emitter of the transistor Q is connected to the power supply voltage VCC through another element. One end of the light receiving unit 200 is connected to the base of the transistor Q, and the other end of the light receiving unit 210 is connected to the collector of the transistor Q.
In this application, the detection principle of photoelectricity correlation sensor circuit does, when being taken place to remove by the detection object, light that light receiving unit 210 received light that light-emitting end module 100 sent, and the inside resistance of light receiving unit 210 descends, and the voltage change of triode Q base reaches triode Q's conduction voltage, and triode Q is switched on, and the circuit circular telegram just can judge that the object has taken place to remove.
In the embodiment of the present application, the base voltage of the transistor Q can be adjusted by the base voltage adjusting unit 220, so that the base voltage of the transistor Q can be adjusted to a cut-off and conduction critical point through the base voltage adjusting unit 220, and thus, when any point of a detected object slightly moves, the transistor Q can be conducted, so that the photoelectric correlation sensor circuit of the embodiment of the present application can detect any slight position change of the detected object. For example, a slight positional change of 0.1mm of the object to be detected can be detected.
In specific implementation, the base voltage adjusting unit 220 may be selected in many ways as long as the base voltage of the transistor Q can be adjusted. As shown in fig. 2, the base voltage adjusting unit 220 may employ a first resistor R1, such as an adjustable resistor; as also shown in fig. 3, the base voltage regulation unit 220 may employ an adjustable voltage regulator module.
As shown in fig. 2, when the base voltage adjusting unit 220 employs the first resistor R1, one end of the first resistor R1 is connected to the emitter of the transistor Q, and the other end of the first resistor R1 is connected to the base of the transistor Q. The first resistor R1 is preferably a precision adjustable resistor to achieve a continuously adjustable resistance, so that the base voltage of the transistor Q can be continuously adjusted until a critical value is reached. In other embodiments, the first resistor R1 may also be a fixed resistor, and the first resistor R1 with a proper resistance value may be selected by calculating the resistance value of the first resistor R1 required to adjust the base voltage of the transistor Q to a critical value. When the first resistor R1 is a precision adjustable resistor, the model of the precision adjustable resistor may be W503, and the maximum resistance value is 50K Ω, that is, the resistance value may be continuously adjusted between 0K Ω and 50K Ω.
As shown in fig. 3, when the base voltage adjusting unit 220 employs an adjustable regulated power supply, an OUT pin of the adjustable regulated power supply is connected to a base of the transistor Q. The adjustable regulated power supply shares three pins, and as shown in fig. 3, the three pins of the adjustable regulated power supply are respectively connected to the power supply voltage VCC, the ground GND and the base of the triode Q. The base voltage of the triode Q can be continuously regulated by the adjustable voltage-stabilized source until the base voltage is regulated to a critical value.
As shown in fig. 2, the light receiving unit 210 may employ a photo-sensitive receiving diode D. The negative pole of the photosensitive receiving diode D is connected with the base electrode of the triode Q, and the positive pole of the photosensitive receiving diode D is connected with the collector electrode of the triode Q. In other embodiments, the light receiving unit 210 may also employ other types of light receiving elements, such as a photosensitive triode, and the like, without limitation. In this application, a black photo receiver diode D is used. Referring to fig. 2, the collector of the transistor Q is grounded to GND.
As shown in fig. 2, the receiving end module 200 further includes an optical coupler IC. The input end of the optical coupling IC is connected with the emitting electrode of the triode Q, and the output end of the optical coupling IC is connected with a PLC (Programmable Logic Controller) Controller. Meanwhile, the input end of the optocoupler IC is connected to a power supply voltage VCC so as to realize conduction and electrification of the triode Q. It can be understood that the input end of the optical coupler IC refers to one end of the optical coupler IC where the light emitting diode is disposed, and the output end of the optical coupler IC refers to one end of the optical coupler IC where the photosensitive triode is disposed. When the triode Q is conducted, current passes through a light emitting diode in the optical coupler IC to emit light, and the photosensitive triode in the optical coupler IC serves as a photosensitive element and generates current after being illuminated, so that signals are transmitted to the PLC controller, and the PLC controller can judge that the detected object moves. The optocoupler IC can adopt an optocoupler IC with the model number MOC 3041. As shown IN fig. 2, the output end of the optical coupler IC is connected to the PLC controller, specifically, the output end of the optical coupler IC is connected to an input terminal PLC-IN1 of the PLC controller, and the input terminal PLC-IN1 is at a high level when no signal is received.
With continued reference to fig. 2, the receiver module 200 further includes a second resistor R2. One end of the second resistor R2 is connected with a power supply voltage VCC, and the other end of the second resistor R2 is connected with the input end of the optical coupler IC. The second resistor R2 is provided to control the current in the loop, ensuring that the current is within a safe range. The power supply voltage VCC may be DC24V or DC48V, and in the embodiment of the present application, the power supply voltage VCC is a DC24V switching power supply. The second resistor R2 may use a color circle resistance of 2.2K Ω, 1/4W.
As shown in fig. 2, the light emitting terminal module includes a third resistor R3 and a light emitting diode LED. One end of the third resistor R3 is connected with the power supply voltage VCC, the other end of the third resistor R3 is connected with one end of the light-emitting diode LED, and the other end of the light-emitting diode LED is grounded GND. After the light-emitting end module is powered on, as shown by the hollow dotted arrow in fig. 2, a current loop VCC → R3 → LED → GND is formed, so that the light-emitting diode LED emits light. In one embodiment, the third resistor R3 is a color wheel resistor of 3.9K Ω and 1/4W. The LED is an infrared LED with a diameter of 3mm or 5mm and a wavelength of 940 nm.
In the embodiment of the application, all electronic devices can adopt a patch type or a plug-in type.
The working principle of the photoelectric correlation sensor circuit is as follows (refer to fig. 2):
after the power supply voltage VCC is switched on, the light emitting diode LED is powered on, and the light emitting diode LED emits infrared light with the wavelength of 940 nm;
under the condition that the detected object or other shelters are not placed, the photosensitive receiving diode D can receive infrared light emitted by the light emitting diode LED; the resistance value of the photosensitive receiving diode D is reduced after the photosensitive receiving diode D receives the infrared light;
because one end of the photosensitive receiving diode D is connected with the base electrode of the triode Q, and the other end of the photosensitive receiving diode D is connected with the ground GND, when the resistance value of the photosensitive receiving diode D is reduced, the voltage of the base electrode of the triode Q is also pulled down; when the emitter and the collector of the transistor Q are conductive, as indicated by the hollow dashed arrows in fig. 2, the following current loop is formed,
VCC→R2→IC→Q→GND；
when current flows through a light emitting diode in the optocoupler IC, the light emitting diode emits light, and a photosensitive triode at the output end of the IC is conducted after receiving the light; when the photosensitive triode is conducted, the input terminal PLC-IN1 of the PLC controller receives a signal, so that whether a detected object exists or not can be judged through the PLC;
referring to fig. 4, the light emitting diode LED of the light emitting end module 100 and the photosensitive receiving diode D of the receiving end module 200 are oppositely arranged, the detected object is placed between the light emitting diode LED and the photosensitive receiving diode D, and the base voltage of the transistor Q can be adjusted to the cut-off and conduction critical point by setting the adjustable precision resistor R1 to pull up the base voltage of the transistor Q;
when the detected object generates a small movement of 0.1mm, the PLC-IN1 can immediately detect and make a judgment.
As shown in fig. 4, the present application also provides an optical-electrical correlation sensor. The photoelectric correlation sensor comprises the photoelectric correlation sensor circuit and further comprises a first fixed seat 101 and a second fixed seat 102 which are arranged oppositely. The light emitting element (i.e., the light emitting diode LED) of the light emitting end module 100 is mounted on the first fixing base 101, and the light receiving element (i.e., the light sensitive receiving diode D) of the light receiving unit 210 is mounted on the second fixing base 102. Through the arrangement of the first fixing seat 101 and the second fixing seat 102, the light emitting diode LED and the photosensitive receiving diode D can be fixed and arranged oppositely, so as to realize the emission and the reception of light.
In the embodiment shown in fig. 4, the photo-electric correlation sensor is used for detecting the height change of the detected object, and the light emitting diode LED and the photosensitive receiving diode D in fig. 4 are arranged oppositely left and right, and can be detected when the height of the detected object slightly changes. In other embodiments, the photoelectric correlation sensor can be used to detect movement of the detected object in other directions. For example, the light emitting diode LED and the light sensitive receiving diode D are arranged opposite to each other up and down, so that the position change of the object in the horizontal direction can be detected. The detection can be performed when the detected object has a slight displacement in the horizontal direction.
It should be understood that the above examples are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the present application. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims (10)
1. A photoelectric correlation sensor circuit is characterized by comprising a light-emitting end module and a receiving end module, wherein the light-emitting end module can emit light rays, and the emitted light rays are received by the receiving end module; the receiving end module includes: the triode, the light receiving unit and the base voltage regulating unit; the base voltage adjusting unit is connected with the base of the triode and can adjust the base voltage of the triode; one end of the light receiving unit is connected with the base electrode of the triode, and the other end of the light receiving unit is connected with the collector electrode of the triode.
2. The photoelectric correlation sensor circuit of claim 1, wherein the base voltage adjustment unit is a first resistor or an adjustable regulated power supply.
3. The photo-correlation sensor circuit according to claim 2, wherein when the base voltage adjustment unit is a first resistor, the first resistor is an adjustable resistor.
4. The photo-correlation sensor circuit as claimed in claim 2, wherein when the base voltage adjusting unit is a first resistor, one end of the first resistor is connected to the emitter of the transistor, and the other end of the first resistor is connected to the base of the transistor.
5. The photoelectric correlation sensor circuit of claim 2, wherein when the base voltage regulation unit is an adjustable regulated voltage supply, an OUT pin of the adjustable regulated voltage supply is connected with a base of the triode.
6. The photo-correlation sensor circuit of claim 1, wherein the light receiving unit is a photo-sensitive receiving diode, a cathode of the photo-sensitive receiving diode is connected to a base of the transistor, and an anode of the photo-sensitive receiving diode is connected to a collector of the transistor.
7. The photoelectric correlation sensor circuit of claim 1, wherein the receiving end module further comprises an optocoupler; the input end of the optical coupler is connected with the emitting electrode of the triode, and the output end of the optical coupler is connected with the PLC.
8. The photoelectric correlation sensor circuit of claim 7, wherein the receiving end module further comprises a second resistor, one end of the second resistor is connected to a power supply voltage VCC, and the other end of the second resistor is connected to an input end of the optocoupler.
9. The photo-correlation sensor circuit of claim 1, wherein the light emitting end module comprises: a third resistor and a light emitting diode; one end of the third resistor is connected with a power supply voltage VCC, the other end of the third resistor is connected with one end of the light-emitting diode, and the other end of the light-emitting diode is grounded.
10. An optoelectronic correlation sensor, comprising the optoelectronic correlation sensor circuit as claimed in any one of claims 1 to 9, further comprising a first fixing base and a second fixing base disposed oppositely, wherein the light emitting element of the light emitting end module is disposed on the first fixing base, and the light receiving element of the light receiving unit is disposed on the second fixing base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220510418.7U CN217442581U (en) | 2022-03-08 | 2022-03-08 | Photoelectric correlation sensor circuit and photoelectric correlation sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220510418.7U CN217442581U (en) | 2022-03-08 | 2022-03-08 | Photoelectric correlation sensor circuit and photoelectric correlation sensor |
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| Publication Number | Publication Date |
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| CN217442581U true CN217442581U (en) | 2022-09-16 |
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| CN202220510418.7U Active CN217442581U (en) | 2022-03-08 | 2022-03-08 | Photoelectric correlation sensor circuit and photoelectric correlation sensor |
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- 2022-03-08 CN CN202220510418.7U patent/CN217442581U/en active Active
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