CN113358141A - Photoelectric sensor and signal processing method - Google Patents
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Abstract
The embodiment of the application provides a photoelectric sensor and a signal processing method. Because the first electric signal with a smaller duty ratio is generated on the light projecting side and is widened on the light receiving side, the light redundancy can be effectively improved under the same light emitting power, and the light emitting energy consumption can be effectively reduced under the same light redundancy. In addition, during the non-light emission period of the transmitted first optical signal, the second electrical signal received and converted is not amplified and the output of the second electrical signal is blocked, so that the influence of external disturbance light can be prevented, and the accuracy of the detection result detected by the output signal of the photoelectric sensor can be ensured.
Description
Technical Field
The present disclosure relates to the field of photoelectric detection, and more particularly, to a photoelectric sensor and a signal processing method.
Background
Photoelectric sensors are widely used in various fields. The photoelectric sensor comprises a light projecting part and a light receiving part, wherein the light projecting part emits a light signal according to a generated carrier signal with a certain duty ratio, and the light receiving part receives the light signal, converts the light signal into a receiving signal with the same duty ratio as the carrier signal, amplifies and shapes the receiving signal and outputs the receiving signal.
It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.
Disclosure of Invention
However, the inventors have found that the light emission power consumption of the light projecting section is large, and when the power consumption of the light source of the light projecting section, such as an LED light source, is limited, the increase of the light emission current is limited, so that the light redundancy is low; in addition, when the external disturbance light of the light projecting section cannot be received by the light receiving section, the external disturbance light received by the light receiving section is converted into an electric signal and output, and the detection result of the photosensor is easily adversely affected.
Embodiments of the present application provide a photoelectric sensor and a signal processing method, which can solve one or more of the above problems.
According to a first aspect of embodiments of the present application, there is provided a photosensor including: a signal generating section that generates a first electric signal having a first duty ratio; a light projecting unit that converts the first electrical signal generated by the signal generating unit into a first optical signal and transmits the first optical signal; a light receiving unit that receives a second optical signal and converts the second optical signal into a second electrical signal; a synchronous amplification unit that amplifies the second electrical signal received and converted by the light receiving unit and outputs the amplified second electrical signal during a light emission period of the first optical signal transmitted by the light projecting unit, and that does not amplify the second electrical signal received and converted by the light receiving unit and prevents the second electrical signal received and converted by the light receiving unit from being output during a non-light emission period of the first optical signal transmitted by the light projecting unit; and a widening section that widens the amplified second electric signal output by the synchronous amplification section and outputs a widened second electric signal, the widened second electric signal having a second duty ratio that is larger than the first duty ratio.
According to a second aspect of embodiments of the present application, wherein the synchronous amplifying section includes: a synchronization circuit that allows the second electric signal received and converted by the light receiving unit to pass therethrough during a light emission period of the first optical signal transmitted by the light projecting unit, and prevents the second electric signal received and converted by the light receiving unit from passing therethrough during a non-light emission period of the first optical signal transmitted by the light projecting unit; and an amplifying circuit that amplifies the second electric signal passing through the synchronization circuit.
According to a third aspect of embodiments herein, wherein the synchronization circuit comprises: a controllable gate circuit or electronic switch that outputs a low-level signal during a light emission period of the first optical signal transmitted from the light-emitting unit and outputs a high-level signal during a non-light emission period of the first optical signal transmitted from the light-emitting unit; a transistor connected to an output terminal of the controllable gate circuit or the electronic switch, and turned off when the controllable gate circuit or the electronic switch outputs a low level signal and turned on when the controllable gate circuit or the electronic switch outputs a high level signal; and a first resistor connected to the light receiving part and the transistor, wherein when the transistor is turned off, a second electric signal converted by the light receiving part is converted into a voltage by the first resistor and is input to the amplifying circuit, and when the transistor is turned on, the first resistor is short-circuited, and the second electric signal converted by the light receiving part cannot be converted into a voltage by the first resistor.
According to the fourth aspect of the embodiments of the present application, the widened portion includes a trigger circuit and a shaping circuit, and the trigger circuit triggers the shaping circuit to shape the amplified second electric signal into the second electric signal having the second duty ratio according to the amplified second electric signal output by the synchronous amplifying portion.
According to a fifth aspect of the embodiments of the present application, the trigger circuit includes a first comparison circuit and a charge and discharge circuit, when the amplified second electrical signal output by the synchronous amplifying section input into the first comparison circuit is a rising edge and a voltage of the amplified second electrical signal exceeds a first reference voltage, the first comparison circuit outputs a low level, and the charge and discharge circuit performs charging; the shaping circuit includes a second comparison circuit that compares an output signal of the charge/discharge circuit with a second reference voltage and outputs a second electric signal having the second duty ratio, and the first comparison circuit outputs a high level when the amplified second electric signal output by the synchronous amplification section input to the first comparison circuit falls back to the first reference voltage, and the charge/discharge circuit discharges.
According to a sixth aspect of embodiments herein, the second reference voltage is adjustable according to the second duty cycle.
A seventh aspect according to embodiments of the present application, wherein the second duty cycle is N times the first duty cycle, the N being greater than or equal to 10.
According to an eighth aspect of the embodiments of the present application, wherein the photosensor is a photosensor having a main body having a groove, and the plurality of light projecting portions and the plurality of light receiving portions are provided on opposite sides of the groove in correspondence.
According to a ninth aspect of the embodiment of the present invention, the first electric signal generated by the signal generating unit includes a plurality of square wave pulse signals having the same first duty ratio and different phases, the plurality of light projecting units convert the plurality of square wave pulse signals into a plurality of first optical signals and transmit the plurality of first optical signals, the plurality of light receiving units receive a plurality of second optical signals and convert the plurality of second optical signals into a plurality of second electric signals, the plurality of synchronous amplifying units amplify the plurality of second electric signals, and the plurality of expanding units expand the plurality of amplified second electric signals and output the plurality of expanded second electric signals.
According to a tenth aspect of embodiments of the present application, there is provided a signal processing method of a photosensor, the method including: generating a first electrical signal having a first duty cycle; converting the generated first electrical signal into a first optical signal and transmitting the first optical signal; receiving a second optical signal and converting the second optical signal into a second electrical signal; amplifying the received and converted second electrical signal and outputting the amplified second electrical signal during a light emission period of the transmitted first optical signal, and not amplifying the received and converted electrical signal and preventing the received and converted second electrical signal from being output during a non-light emission period of the transmitted first optical signal; and broadening the output amplified second electric signal, and outputting the broadened second electric signal, wherein the broadened second electric signal has a second duty ratio, and the second duty ratio is greater than the first duty ratio.
The beneficial effects of the embodiment of the application are that: because the first electric signal with a smaller duty ratio is generated on the light projecting side and is widened on the light receiving side, the light redundancy can be effectively improved under the same light emitting power, and the light emitting energy consumption can be effectively reduced under the same light redundancy. In addition, during the non-light emission period of the transmitted first optical signal, the second electrical signal received and converted is not amplified and the output of the second electrical signal is blocked, so that the influence of external disturbance light can be prevented, and the accuracy of the detection result detected by the output signal of the photoelectric sensor can be ensured.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
The feature information described and illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with or instead of the feature information in the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
Many aspects of the disclosure can be better understood with reference to the following drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. For convenience in illustration and description, corresponding parts in the drawings may be exaggerated or minimized in order to facilitate illustration and description of some portions of the present application. Elements and feature information described in one drawing or one embodiment of the present application may be combined with elements and feature information shown in one or more other drawings or embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.
In the drawings:
fig. 1 is a schematic block diagram of a photosensor according to embodiment 1 of the present application;
fig. 2 is a circuit configuration diagram of the synchronous amplifying section 140 according to embodiment 1 of the present application;
fig. 3 is a circuit configuration diagram of the widened portion 150 according to embodiment 1 of the present application;
FIG. 4 is a schematic diagram of waveforms at some of the nodes in the circuit configuration shown in FIG. 3;
FIG. 5 is another modular schematic of the photosensor of embodiment 1 of the present application;
fig. 6 is a schematic diagram of a signal processing method of a photoelectric sensor according to embodiment 2 of the present application.
Detailed Description
Preferred embodiments of the present application will be described below with reference to the accompanying drawings.
Example 1
The embodiment of the application provides a photoelectric sensor. Fig. 1 is a schematic block diagram of a photosensor according to embodiment 1 of the present application. As shown in fig. 1, the photosensor 100 includes:
a signal generating part 110 generating a first electric signal having a first duty ratio;
a light projecting unit 120 that converts the first electrical signal generated by the signal generating unit 100 into a first optical signal and transmits the first optical signal;
a light receiving part 130 that receives the second optical signal and converts the second optical signal into a second electrical signal;
a synchronous amplification unit 140 that amplifies the second electrical signal received and converted by the light receiving unit 130 and outputs the amplified second electrical signal during a light emission period of the first optical signal transmitted by the light projecting unit 120, and that does not amplify the second electrical signal received and converted by the light receiving unit 130 and prevents the second electrical signal received and converted by the light receiving unit 130 from being output during a non-light emission period of the first optical signal transmitted by the light projecting unit 120; and
and a widening section 150 that widens the amplified second electric signal output by the synchronous amplification section 140 and outputs a widened second electric signal having a second duty ratio that is larger than the first duty ratio.
In this way, since the first electrical signal having a small duty ratio is generated on the light emitting side and is spread on the light receiving side, the light redundancy can be effectively improved at the same light emission power, and the light emission power consumption can be effectively reduced at the same light redundancy. In addition, during the non-light emission period of the transmitted first optical signal, the second electrical signal received and converted is not amplified and the output of the second electrical signal is blocked, so that the influence of external disturbance light can be prevented, and the accuracy of the detection result detected by the output signal of the photoelectric sensor can be ensured.
In the embodiment of the present application, in order to distinguish between the electric signals on the light projecting side and the light receiving side, the first electric signal is used to represent the electric signal generated on the light projecting side, and the second electric signal is used to represent the electric signal into which the light receiving side receives and converts the light.
In order to distinguish between the optical signals on the light emitting side and the light receiving side, the first optical signal is used to represent the optical signal emitted from the light emitting side, and the second optical signal is used to represent the optical signal received by the light receiving side.
The first electrical signal generated by the signal generating unit 110 serves as a carrier signal of the first optical signal for detection, and in an alternative embodiment, the first electrical signal generated by the signal generating unit 110 is a square wave pulse signal, as shown in fig. 1, and the signal generating unit 110 generates a square wave pulse signal with a first duty ratio.
A specific method of generating the first electrical signal with the first duty ratio by the signal generating portion 110 may refer to the related art, and will not be described in detail here.
The light projecting unit 120 converts the first electrical signal generated by the signal generating unit 110 into a first optical signal for detection, and transmits the first optical signal.
The Light projecting section 120 may be various types of electro-optical conversion elements, for example, as shown in fig. 1, the Light projecting section 120 is a Light Emitting Diode (LED).
The light receiving unit 130 is disposed opposite to the light projecting unit 120 to receive the second optical signal and convert the second optical signal into a second electrical signal; the light receiving unit 130 may receive external disturbance light, such as sunlight or lamp light, in addition to the optical signal generated by the light projecting unit 120 after the first optical signal passes through the detection object.
The light receiving part 130 may be various types of photoelectric conversion elements, for example, as shown in fig. 1, the light receiving part 130 is a Photodiode (PD).
The synchronous amplifier 140 amplifies the second electrical signal received and converted by the light receiving unit 130 and outputs the amplified second electrical signal during the light emission period of the first optical signal transmitted by the light projecting unit 120, and does not amplify the second electrical signal received and converted by the light receiving unit 130 and prevents the output of the second electrical signal during the non-light emission period of the first optical signal transmitted by the light projecting unit 120.
In an alternative embodiment, the synchronization amplifying unit 140 is connected to the signal generating unit 110 to determine a light emission period and a non-light emission period of the first optical signal transmitted from the light projecting unit 120.
In an alternative embodiment, the light emission period of the first optical signal transmitted by the light projecting unit 120 corresponds to a period in which the first electrical signal generated by the signal generating unit 110 is at a high level, and the non-light emission period of the first optical signal transmitted by the light projecting unit 120 corresponds to a period in which the first electrical signal generated by the signal generating unit 110 is at a low level.
In an alternative embodiment, as shown in fig. 1, the synchronous amplifying section 140 includes:
a synchronization circuit 141 that allows the second electrical signal received and converted by the light receiving unit 130 to pass therethrough during a light emission period of the first optical signal transmitted by the light projecting unit 120, and prevents the second electrical signal received and converted by the light receiving unit 130 from passing therethrough during a non-light emission period of the first optical signal transmitted by the light projecting unit 120; and
and an amplification circuit 142 that amplifies the second electric signal passing through the synchronization circuit 141.
Hereinafter, a circuit configuration of the synchronous amplifying unit 140 will be described as an example.
Fig. 2 is a circuit configuration diagram of the synchronous amplifying unit 140 according to embodiment 1 of the present application. As shown in fig. 2, the synchronous amplifying section 140 includes a synchronous circuit 141 and an amplifying circuit 142.
As shown in fig. 2, the synchronization circuit 141 includes:
a controllable gate circuit U1 that outputs a low-level signal during a light emission period of the first optical signal transmitted by the light-emitting unit 120, that is, during a period when the first electrical signal is at a high level, and outputs a high-level signal during a non-light emission period of the first optical signal transmitted by the light-emitting unit 120, that is, during a period when the first electrical signal is at a low level;
a transistor T1 connected to the output terminal of the controllable gate circuit U1, and the transistor T1 is turned off when the controllable gate circuit U1 outputs a low-level signal and turned on when the controllable gate circuit U1 outputs a high-level signal; and
a first resistor R1 connected to the light receiving part 130 and the transistor T1,
when the transistor T1 is turned off, the second electric signal converted by the light receiving unit 130 is converted into a voltage by the first resistor R1 and is input to the amplifier circuit 142, and when the transistor T1 is turned on, the first resistor R1 is short-circuited, and the second electric signal converted by the light receiving unit 130 cannot be converted into a voltage by the first resistor R1.
In an alternative embodiment, the first electrical signal generated by the signal generating section 110 is input to the controllable gate circuit U1, and a signal VG synchronized and inverted with the first electrical signal is generated.
In this way, during the light emission period of the first optical signal transmitted from the light emitter 120, the controllable gate circuit U1 outputs a low-level signal, the transistor T1 is turned off, and the second electrical signal converted by the light receiver 130 is converted into a voltage by the first resistor R1 and is input to the amplifier circuit 142; in the non-emission period of the first optical signal transmitted from the light emitter 120, the controllable gate circuit U1 outputs a high-level signal, the transistor T1 is turned on, the first resistor R1 is short-circuited, and the second electrical signal converted by the light receiver 130 is not converted into a voltage by the first resistor R1. Thereby, it is possible to effectively prevent the influence of external disturbance light during non-light emission.
In an alternative embodiment, the controllable gate U1 may be replaced with an electronic switch to achieve a similar function.
In an alternative embodiment, the transistor T1 is, for example, an NMOS transistor, and the resistance of the first resistor R1 can be set according to actual needs.
As shown in fig. 2, the amplifying circuit 142 may include a second resistor R2, a third resistor R3, and an amplifier AMP, a negative input terminal of which is input with the output signal of the synchronizing circuit 141 via the second resistor R2, and a positive input terminal of which is input with the reference voltage VREF. The amplified second electrical signal output from the amplifying circuit 142 is input to the widening section 150 to be widened.
The widening section 150 widens the amplified second electric signal output by the synchronous amplifying section 140, and outputs a widened second electric signal having a second duty ratio that is larger than the first duty ratio.
The second duty cycle is a greater duty cycle than the first duty cycle, and in an alternative embodiment, the second duty cycle is substantially greater than the first duty cycle.
In an alternative embodiment, the second duty cycle is N times the first duty cycle, e.g., the N is greater than or equal to 10. Thus, the light emission power consumption can be further reduced.
As shown in fig. 1, the widened portion 150 may include a trigger circuit 151 and a shaping circuit 152.
The flip-flop circuit 151, based on the amplified second electric signal output from the synchronous amplifying unit 140, flip-flop the shaping circuit 152 to shape the amplified second electric signal into a second electric signal having a second duty ratio.
Hereinafter, a circuit configuration of the widened portion 150 will be described as an example.
Fig. 3 is a circuit configuration diagram of the widened portion 150 according to embodiment 1 of the present application.
As shown in fig. 3, the widened portion 150 includes a trigger circuit 151 and a shaping circuit 152,
the flip-flop circuit 151 includes a first comparison circuit 153 and a charge/discharge circuit 154, and when the amplified second electrical signal output from the synchronous amplifying section 140 input to the first comparison circuit 153 is a rising edge and the voltage of the amplified second electrical signal exceeds the first reference voltage VREF1, the first comparison circuit 153 outputs a low level and the charge/discharge circuit 154 charges; when the amplified second electric signal output from the synchronous amplifying section 140 input to the first comparison circuit 153 falls back to the first reference voltage VREF1, the first comparison circuit 153 outputs a high level, and the charge/discharge circuit 154 discharges.
The first comparison circuit 153 includes a fourth resistor R4, a first comparator CMP1, and a fifth resistor R5, the charging/discharging circuit 154 includes a fifth resistor R6 and a capacitor C1 to form a resistance-capacitance discharge, a path 1 in fig. 3 is a charging path, and a path 2 is a discharging path.
The shaping circuit 152 includes a second comparator CMP2, which is a second comparison circuit, and the second comparator CMP2 compares the output signal of the charge and discharge circuit 154 with a second reference voltage VREF2 and outputs a second electrical signal having a second duty ratio.
In an alternative embodiment, the second reference voltage is determined according to the magnitude of the second duty cycle. In this way, different requirements for the second duty cycle can be met.
Fig. 4 is a schematic diagram of waveforms at some nodes in the circuit configuration shown in fig. 3. As shown in fig. 4, which shows waveforms at nodes a, b, c in the circuit configuration shown in fig. 3.
As shown in fig. 3 and 4, as shown by the waveform at the node a, the amplified second electrical signal output by the synchronous amplifying section 140 is input, which has a small duty ratio, the charging and discharging circuit 154 starts charging when the amplified second electrical signal is a rising edge and the voltage of the amplified electrical signal exceeds the first reference voltage VREF1, and the charging and discharging circuit 154 starts discharging when the amplified second electrical signal output by the synchronous amplifying section 140 input into the first comparing circuit 153 falls back to a low level. As shown by the waveform at the node b, T1 is a charge period, and T2 is a discharge period. As shown by the waveform at the node c, it is a second electrical signal after being stretched after passing through the second comparator CMP2, and has a larger second duty ratio, wherein, when the charging and discharging circuit 154 starts charging, the output voltage of the charging and discharging circuit 154, i.e., the voltage at the node b, is decreased from exceeding the second reference voltage VREF2 to being smaller than the second reference voltage VREF2, the second comparator CMP2 outputs a low level, and, in the process that the charging and discharging circuit 154 starts discharging after the charging is completed, the second comparator CMP2 outputs a high level when the output voltage of the charging and discharging circuit 154, i.e., the voltage at the node b, is increased from being smaller than the second reference voltage VREF2 to exceeding the second reference voltage VREF 2.
By the circuit structure, pulse widening can be reliably realized, and the size of the second reference voltage VREF2 can be adjusted according to the requirement of the duty ratio of the output signal.
In an alternative embodiment, as shown in fig. 1, the photoelectric sensor 100 may further include an output portion 160 that processes the signal output by the widened portion 150 into a positive-negative signal output. The specific structure of the output section 160 may refer to the related art and will not be described in detail here.
In an alternative embodiment, other structures of the photoelectric sensor 100 can be found in the related art, and are not described in detail herein.
In an alternative embodiment, the photosensor 100 has a body having a groove, and the plurality of light projecting portions 120 and the plurality of light receiving portions 130 are correspondingly disposed on opposite sides of the groove.
In an alternative embodiment, the first electrical signal generated by the signal generating unit 100 may include a plurality of square wave pulse signals, the square wave pulse signals have the same first duty ratio and have different phases, and the plurality of light projecting units respectively convert the square wave pulse signals into a plurality of first optical signals and respectively send the plurality of first optical signals, for example, the plurality of first optical signals are respectively a path, a path B, a path C, and a path Z.
The plurality of light receiving units 130 receive the plurality of second optical signals and convert the plurality of second optical signals into a plurality of second electrical signals, respectively, the plurality of synchronous amplifying units 140 amplify the plurality of second electrical signals, respectively, and the plurality of widening units 150 widen the plurality of amplified second electrical signals and output the plurality of widened second electrical signals, respectively. The output units 160 process the signals output from the broadening units 150 into positive and negative signals, respectively.
In an alternative embodiment, four paths of signals, i.e., a path, and a path Z, are taken as an example for explanation.
Fig. 5 is another schematic block diagram of the photoelectric sensor according to embodiment 1 of the present application. As shown in fig. 5, the photosensor 100' includes:
a signal generating unit 110 for generating 4 paths of square wave pulse signals, wherein the 4 paths of square wave pulse signals have the same first duty ratio and different phases, and the 4 paths of signals are respectively a path A, a path B, a path C and a path Z;
4 light-projecting parts 120 for converting the 4-path square wave pulse signals generated by the signal generating part 110 into first optical signals and transmitting the first optical signals;
4 light receiving units 130 that receive the second optical signals and convert the second optical signals into second electrical signals, respectively;
4 synchronous amplifying units 140 for amplifying the second electrical signals received and converted by the 4 light receiving units 130 and outputting the amplified second electrical signals during the light emission periods of the first optical signals transmitted by the 4 light emitting units 120, respectively, and for preventing the second electrical signals from being output without amplifying the second electrical signals received and converted by the 4 light receiving units 130 and outputting the second electrical signals during the non-light emission periods of the first optical signals transmitted by the 4 light emitting units 120, respectively;
4 widening sections 150 that widen the amplified second electric signals output from the 4 synchronous amplifying sections 140, respectively, and output widened second electric signals having a second duty ratio that is larger than the first duty ratio; and
and 4 output units 160 for processing the signals output from the 4 widening units 150 into positive and negative signals, respectively.
The signal generating unit 110, the light projecting unit 120, the light receiving unit 130, the synchronous amplifying unit 140, the widening unit 150, and the output unit 160 have the same configurations and functions as those of fig. 1, and a description thereof will not be repeated.
As is apparent from the above-described embodiments, since the first electrical signal having a small duty ratio is generated on the light emitting side and is spread on the light receiving side, the light redundancy can be effectively improved at the same light emission power, and the light emission power consumption can be effectively reduced at the same light redundancy. In addition, during the non-light emission period of the transmitted first optical signal, the second electrical signal received and converted is not amplified and the output of the second electrical signal is blocked, so that the influence of external disturbance light can be prevented, and the accuracy of the detection result detected by the output signal of the photoelectric sensor can be ensured.
Example 2
The embodiment of the present application further provides a signal processing method of a photoelectric sensor, where the photoelectric sensor may be the photoelectric sensor described in embodiment 1.
Fig. 6 is a schematic diagram of a signal processing method of a photoelectric sensor according to embodiment 2 of the present application. As shown in fig. 6, the method includes:
step 601: generating a first electrical signal having a first duty cycle;
step 602: converting the generated first electrical signal into a first optical signal and transmitting the first optical signal;
step 603: receiving a second optical signal and converting the second optical signal into a second electrical signal;
step 604: amplifying the received and converted second electrical signal and outputting the amplified second electrical signal during a light emitting period of the transmitted first optical signal, and not amplifying the received and converted second electrical signal and preventing the received and converted second electrical signal from being output during a non-light emitting period of the transmitted first optical signal; and
step 605: broadening the output amplified second electric signal, and outputting a broadened second electric signal, where the broadened second electric signal has a second duty cycle, and the second duty cycle is greater than the first duty cycle.
In an alternative embodiment, as shown in fig. 6, the method may further include:
step 606: and processing the second electric signal after widening into a positive path signal and a negative path signal for output.
In an alternative embodiment, the second duty cycle is N times the first duty cycle, the N being greater than or equal to 10.
The specific implementation method of each step can be referred to the description in embodiment 1, and the description is not repeated here.
As is apparent from the above-described embodiments, since the first electrical signal having a small duty ratio is generated on the light emitting side and is spread on the light receiving side, the light redundancy can be effectively improved at the same light emission power, and the light emission power consumption can be effectively reduced at the same light redundancy. In addition, during the non-light emission period of the transmitted first optical signal, the second electrical signal received and converted is not amplified and the output of the second electrical signal is blocked, so that the influence of external disturbance light can be prevented, and the accuracy of the detection result detected by the output signal of the photoelectric sensor can be ensured.
The above apparatus and method of the present application may be implemented by hardware, or may be implemented by hardware in combination with software. The present application relates to a computer-readable program which, when executed by a logic component, enables the logic component to implement the above apparatus or constituent components, or the logic component to implement the above various methods or steps.
The present application also relates to a storage medium such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like, for storing the above program.
The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.
Claims (10)
1. A photosensor, comprising:
a signal generating section that generates a first electric signal having a first duty ratio;
a light projecting unit that converts the first electrical signal generated by the signal generating unit into a first optical signal and transmits the first optical signal;
a light receiving unit that receives a second optical signal and converts the second optical signal into a second electrical signal;
a synchronous amplification unit that amplifies the second electrical signal received and converted by the light receiving unit and outputs the amplified second electrical signal during a light emission period of the first optical signal transmitted by the light projecting unit, and that does not amplify the second electrical signal received and converted by the light receiving unit and prevents the second electrical signal received and converted by the light receiving unit from being output during a non-light emission period of the first optical signal transmitted by the light projecting unit; and
and a widening section that widens the amplified second electric signal output by the synchronous amplification section and outputs a widened second electric signal, the widened second electric signal having a second duty ratio that is larger than the first duty ratio.
2. The photosensor according to claim 1, wherein the synchronous amplifying section includes:
a synchronization circuit that allows the second electric signal received and converted by the light receiving unit to pass therethrough during a light emission period of the first optical signal transmitted by the light projecting unit, and prevents the second electric signal received and converted by the light receiving unit from passing therethrough during a non-light emission period of the first optical signal transmitted by the light projecting unit; and
and an amplifying circuit for amplifying the second electric signal passing through the synchronizing circuit.
3. The photosensor circuit of claim 2, wherein the synchronization circuit comprises:
a controllable gate circuit or electronic switch that outputs a low-level signal during a light emission period of the first optical signal transmitted from the light-emitting unit and outputs a high-level signal during a non-light emission period of the first optical signal transmitted from the light-emitting unit;
a transistor connected to an output terminal of the controllable gate circuit or the electronic switch, and turned off when the controllable gate circuit or the electronic switch outputs a low level signal and turned on when the controllable gate circuit or the electronic switch outputs a high level signal; and
a first resistor connected to the light receiving unit and the transistor,
when the transistor is turned off, the first resistor is short-circuited and the second electric signal converted by the light receiving unit is not converted into a voltage by the first resistor.
4. The photosensor according to claim 1,
the widened portion comprises a trigger circuit and a shaping circuit,
the trigger circuit triggers the shaping circuit to shape the amplified second electric signal into a second electric signal with the second duty ratio according to the amplified second electric signal output by the synchronous amplifying unit.
5. The photosensor according to claim 4,
the trigger circuit comprises a first comparison circuit and a charge and discharge circuit, when the amplified second electric signal output by the synchronous amplification part input into the first comparison circuit is a rising edge and the voltage of the amplified second electric signal exceeds a first reference voltage, the first comparison circuit outputs a low level, and the charge and discharge circuit carries out charging; the first comparison circuit outputs a high level when the amplified second electric signal output from the synchronous amplification section input to the first comparison circuit falls back to the first reference voltage, the charge/discharge circuit discharges,
the shaping circuit includes a second comparison circuit that compares an output signal of the charge and discharge circuit with a second reference voltage and outputs a second electric signal having the second duty ratio.
6. The photosensor according to claim 5,
the second reference voltage is determined according to a magnitude of the second duty cycle.
7. The photosensor according to claim 1,
the second duty cycle is N times the first duty cycle, the N being greater than or equal to 10.
8. The photosensor according to any one of claims 1 to 7,
the photosensor has a body with a recess,
the plurality of light projecting parts and the plurality of light receiving parts are correspondingly arranged on two opposite sides of the groove.
9. The photosensor according to claim 8,
the first electric signal generated by the signal generating part comprises a plurality of square wave pulse signals which have the same first duty ratio and different phases,
the plurality of light projecting sections convert the plurality of square wave pulse signals into a plurality of first optical signals and transmit the plurality of first optical signals, the plurality of light receiving sections receive a plurality of second optical signals and convert the plurality of second optical signals into a plurality of second electrical signals, the plurality of synchronous amplifying sections amplify the plurality of second electrical signals, and the plurality of widening sections widen the plurality of amplified second electrical signals and output the plurality of widened second electrical signals.
10. A method of signal processing for a photosensor, the method comprising:
generating a first electrical signal having a first duty cycle;
converting the generated first electrical signal into a first optical signal and transmitting the first optical signal;
receiving a second optical signal and converting the second optical signal into a second electrical signal;
amplifying the received and converted second electrical signal and outputting the amplified second electrical signal during a light emission period of the transmitted first optical signal, and not amplifying the received and converted second electrical signal and preventing the received and converted second electrical signal from being output during a non-light emission period of the transmitted first optical signal; and
broadening the output amplified second electric signal, and outputting the broadened second electric signal, where the broadened second electric signal has a second duty cycle, and the second duty cycle is greater than the first duty cycle.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200534A (en) * | 2021-12-09 | 2022-03-18 | 欧姆龙(上海)有限公司 | Photoelectric sensor and control method thereof |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06169248A (en) * | 1992-11-30 | 1994-06-14 | Sunx Ltd | Photoelectric switch |
| JPH09297184A (en) * | 1996-05-01 | 1997-11-18 | Takenaka Eng Kk | Detecting device of infrared system |
| JP2002217704A (en) * | 2001-01-22 | 2002-08-02 | Sunx Ltd | Photoelectric sensor |
| JP2003142997A (en) * | 2001-10-30 | 2003-05-16 | Sunx Ltd | Multi-optical axis photoelectric sensor |
| WO2008010347A1 (en) * | 2006-07-19 | 2008-01-24 | Masakatsu Kurita | Photoelectric sensor |
| CN101996004A (en) * | 2009-08-12 | 2011-03-30 | 索尼公司 | Detecting device, display device, and object proximity distance measuring method |
| CN102105817A (en) * | 2009-02-10 | 2011-06-22 | 株式会社恩尼怀尔 | Photoelectronic sensor and photoelectronic sensor system |
| CN203387515U (en) * | 2013-06-04 | 2014-01-08 | 青岛海信宽带多媒体技术有限公司 | An outburst reception control circuit and an outburst mode optical receiver |
| CN104483557A (en) * | 2014-12-24 | 2015-04-01 | 中国科学技术大学 | Pulse amplitude measurement circuit and method capable of reducing counting losses |
| CN105258794A (en) * | 2015-11-04 | 2016-01-20 | 中国电子科技集团公司第四十一研究所 | Minimum-duty-ratio semiconductor laser peak value optical power testing device and method |
| CN105259588A (en) * | 2015-11-04 | 2016-01-20 | 常州工学院 | Light curtain detection device without dedicated sync cable, and method therefor |
| CN107870372A (en) * | 2016-09-28 | 2018-04-03 | 欧姆龙株式会社 | Multi-beam photoelectric sensor |
| CN108259131A (en) * | 2017-12-30 | 2018-07-06 | 武汉灵途传感科技有限公司 | A kind of low-power consumption number transmission method, transmitting terminal and receiving terminal |
| CN110312342A (en) * | 2019-06-28 | 2019-10-08 | 上海索迪龙自动化有限公司 | The light projector of photoelectric sensor adjusts system |
-
2020
- 2020-03-06 CN CN202010151596.0A patent/CN113358141B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06169248A (en) * | 1992-11-30 | 1994-06-14 | Sunx Ltd | Photoelectric switch |
| JPH09297184A (en) * | 1996-05-01 | 1997-11-18 | Takenaka Eng Kk | Detecting device of infrared system |
| JP2002217704A (en) * | 2001-01-22 | 2002-08-02 | Sunx Ltd | Photoelectric sensor |
| JP2003142997A (en) * | 2001-10-30 | 2003-05-16 | Sunx Ltd | Multi-optical axis photoelectric sensor |
| WO2008010347A1 (en) * | 2006-07-19 | 2008-01-24 | Masakatsu Kurita | Photoelectric sensor |
| CN102105817A (en) * | 2009-02-10 | 2011-06-22 | 株式会社恩尼怀尔 | Photoelectronic sensor and photoelectronic sensor system |
| CN101996004A (en) * | 2009-08-12 | 2011-03-30 | 索尼公司 | Detecting device, display device, and object proximity distance measuring method |
| CN203387515U (en) * | 2013-06-04 | 2014-01-08 | 青岛海信宽带多媒体技术有限公司 | An outburst reception control circuit and an outburst mode optical receiver |
| CN104483557A (en) * | 2014-12-24 | 2015-04-01 | 中国科学技术大学 | Pulse amplitude measurement circuit and method capable of reducing counting losses |
| CN105258794A (en) * | 2015-11-04 | 2016-01-20 | 中国电子科技集团公司第四十一研究所 | Minimum-duty-ratio semiconductor laser peak value optical power testing device and method |
| CN105259588A (en) * | 2015-11-04 | 2016-01-20 | 常州工学院 | Light curtain detection device without dedicated sync cable, and method therefor |
| CN107870372A (en) * | 2016-09-28 | 2018-04-03 | 欧姆龙株式会社 | Multi-beam photoelectric sensor |
| CN108259131A (en) * | 2017-12-30 | 2018-07-06 | 武汉灵途传感科技有限公司 | A kind of low-power consumption number transmission method, transmitting terminal and receiving terminal |
| CN110312342A (en) * | 2019-06-28 | 2019-10-08 | 上海索迪龙自动化有限公司 | The light projector of photoelectric sensor adjusts system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200534A (en) * | 2021-12-09 | 2022-03-18 | 欧姆龙(上海)有限公司 | Photoelectric sensor and control method thereof |
| CN114200534B (en) * | 2021-12-09 | 2024-04-26 | 欧姆龙(上海)有限公司 | Photoelectric sensor and control method thereof |
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|---|---|
| CN113358141B (en) | 2023-05-09 |
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