CN107966167B - Optical signal receiving device and photoelectric detection equipment - Google Patents
Optical signal receiving device and photoelectric detection equipment Download PDFInfo
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- CN107966167B CN107966167B CN201610910447.1A CN201610910447A CN107966167B CN 107966167 B CN107966167 B CN 107966167B CN 201610910447 A CN201610910447 A CN 201610910447A CN 107966167 B CN107966167 B CN 107966167B
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- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
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- G—PHYSICS
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Abstract
The invention provides an optical signal receiving device and a photoelectric detection device, wherein the optical signal receiving device comprises: the device comprises a current-voltage conversion unit, a filtering unit and a signal acquisition unit; the current-voltage conversion unit is used for receiving the optical signal and converting the received optical signal into a voltage signal; wherein the voltage signal comprises an alternating current component, a direct current component and a noise component; the filtering unit is connected with the output end of the current-voltage conversion unit and used for acquiring a direct current component and a noise component through low-pass filtering; the signal acquisition unit is respectively connected with the output end of the current-voltage conversion unit and the output end of the filtering unit, and differential operation is carried out on the voltage signal output by the current-voltage conversion unit and the direct current component and the noise component output by the filtering unit, so that the alternating current component is acquired. The invention has low cost and simple structure, increases the stability and reliability of output signals and improves the accuracy of photoelectric detection equipment.
Description
Technical Field
The invention relates to the field of photoelectric detection, in particular to an optical signal receiving device and photoelectric detection equipment.
Background
The photoelectric technology is a high and new technology which closely combines the traditional optical technology with the modern electronic technology and the computer technology, and is an important means for acquiring light information or extracting other information (such as force, temperature, sound, current, biology and the like) by means of light.
As is well known, the existing photodetection device includes a light emitting unit and a light receiving unit, and it is more common to use a laser transmitter and a laser receiver. The laser transmitter is used for transmitting a laser signal, and the transmitting intensity of the laser signal is controlled by the intensity of the electric signal; the laser receiver receives the laser signal from the laser transmitter, converts the laser signal into a corresponding electric signal according to the signal intensity of the laser signal, and calculates each detected parameter according to the intensity change of the electric signal at the laser transmitter side and the electric signal at the laser receiver side.
Photoelectric detection devices are widely applied to distance measurement and air dust quality detection. For distance measurement, a certain attenuation occurs through the transmission of laser in the air, and the attenuation is related to the distance of the laser transmission, so that the distance between the laser transmitter and the laser receiver is calculated. And the quality of the air dust is detected based on a light scattering method, laser is emitted into the dust-containing gas, and the dust-containing concentration of the gas is determined according to the change of the light intensity of the received laser signal. It can be seen that the laser signal received by the laser receiver directly affects the calculation of the detected parameters.
At present, the laser signal received by the laser receiver of the photoelectric detection device only considers the external environmental influence on the emitted laser signal in the transmission process, and processes the influence accordingly. However, at the laser transmitter, the laser itself may also be substantially noisy due to the effects of spontaneous emission or fluctuations in the radiation field. Although the basic noise ratio is small, it still interferes with the calculation of the final detected parameter, and affects the accuracy of the value of the detected parameter obtained by the final calculation.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide an optical signal receiving device and a photodetecting apparatus, which are used for solving the problem that the optical signal receiving device of the photodetecting apparatus in the prior art cannot reduce or remove the basic noise of the light itself.
To achieve the above and other related objects, the present invention provides an optical signal receiving apparatus, comprising: the device comprises a current-voltage conversion unit, a filtering unit and a signal acquisition unit; the current-voltage conversion unit is used for receiving an optical signal and converting the received optical signal into a voltage signal; wherein the optical signal comprises an optical signal alternating current component, an optical signal direct current component and an optical noise component; the voltage signal comprises an alternating current component corresponding to the alternating current component of the optical signal, a direct current component corresponding to the direct current component of the optical signal and a noise component corresponding to the optical noise component; the filtering unit is connected with the output end of the current-voltage conversion unit and is used for acquiring the direct current component and the noise component through low-pass filtering; the signal acquisition unit is respectively connected with the output end of the current-voltage conversion unit and the output end of the filtering unit, and differential operation is performed on the voltage signal output by the current-voltage conversion unit and the direct current component and the noise component output by the filtering unit, so that the alternating current component is acquired.
In an embodiment of the invention, the current-voltage conversion unit includes a photosensor for receiving the optical signal, a first operational amplifier, a first resistor and a second resistor; the photoelectric sensor is used for receiving the optical signal and converting the optical signal into a current signal; the negative pole of the first operational amplifier is connected with the inverting input end of the first operational amplifier, and the positive pole of the first operational amplifier is grounded through a first resistor; the first operational amplifier is used for converting the current signal into the voltage signal; the non-inverting input end of the resistor is grounded through the first resistor; the output end of the first operational amplifier is used as the output end of the current-voltage conversion unit, and the output end of the first operational amplifier is further connected with the inverting input end of the first operational amplifier through the second resistor.
In an embodiment of the invention, the first resistor and the second resistor are matched.
In an embodiment of the invention, the filtering unit includes an RC circuit and a second operational amplifier; the RC circuit comprises a third resistor and a capacitor, one end of the third resistor is connected with the output end of the current-voltage conversion unit, and the other end of the third resistor is respectively connected with one end of the capacitor and the positive phase input end of the second operational amplifier; the other end of the capacitor is grounded; the output end of the second operational amplifier is used as the output end of the filtering unit, and the output end of the second operational amplifier is also connected with the inverting input end of the second operational amplifier.
In an embodiment of the invention, the third resistor and the capacitor are associated with the received optical signal.
In an embodiment of the present invention, the signal obtaining unit uses a differential amplifying circuit, and obtains the amplified alternating current component by performing differential amplification on the voltage signal output by the current-voltage converting unit and the direct current component and the noise component output by the filtering unit.
In an embodiment of the invention, the differential amplifying circuit includes a third operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor; the fourth resistor is connected between the inverting input end of the third operational amplifier and the output end of the filtering unit; one end of the fifth resistor is connected with the current-voltage conversion unit, and the other end of the fifth resistor is connected with one end of the sixth resistor and the positive phase input end of the third operational amplifier respectively; the other end of the sixth resistor is grounded; the seventh resistor is connected between the inverting input terminal and the output terminal of the third operational amplifier.
In an embodiment of the invention, the fourth resistor and the fifth resistor have the same resistance; the sixth resistor and the seventh resistor have the same resistance value.
In an embodiment of the invention, a positive power of the operational amplifier used in the optical signal receiving apparatus is connected to a working power source, and a negative power is grounded.
The invention also discloses photoelectric detection equipment which adopts the optical signal receiving device.
As described above, according to the optical signal receiving apparatus and the photoelectric detection device of the present invention, by performing filtering difference processing on the electrical signal converted from the optical signal, not only the dc component of the optical signal is removed, but also the basic noise of light is removed, and finally, the ac component of the voltage signal corresponding to the ac component of the optical signal is obtained stably and reliably, so that the detected value is further more accurate. The circuit of the invention has simple structure, low cost and easy realization, improves the stability and reliability of received optical signals and increases the accuracy of photoelectric detection.
Drawings
Fig. 1 is a schematic circuit diagram of an optical signal receiving apparatus according to an embodiment of the present invention.
Description of the element reference numerals
100 current-voltage conversion unit
200 filter unit
210 RC circuit
300 signal acquisition unit
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
Please refer to the attached drawings. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The invention provides an optical signal receiving device and a photoelectric detection device, which convert a received optical signal into a voltage signal through a simple circuit structure (an operational amplifier, a resistor, a low-pass filter circuit and a differential amplification circuit), remove a direct current component corresponding to a direct current component of the optical signal and a noise component corresponding to an optical noise component in the voltage signal, and enable a final signal provided for the photoelectric detection device to only comprise an alternating current component of the voltage signal corresponding to an alternating current component of the optical signal, thereby enabling a final detection result of the photoelectric detection device to be more accurate.
Examples
As shown in fig. 1, the optical signal receiving apparatus of the present embodiment includes: a current-voltage converting unit 100, a filtering unit 200, and a signal acquiring unit 300. The current-voltage conversion unit 100 is configured to receive an optical signal and convert the received optical signal into a voltage signal. The optical signal comprises an optical signal alternating current component, an optical signal direct current component and an optical noise component. The alternating current component of the optical signal is generated by the emitted optical signal passing through the detected substance; the direct current component of the optical signal is generated by scattering, reflection or refraction of the emitted optical signal; the optical noise component is the fundamental noise of the emitted optical signal. The voltage signal also includes an alternating current component, a direct current component, and a noise component, corresponding to the optical signal; the alternating current component corresponds to the alternating current component of the optical signal; the direct current component corresponds to the optical signal direct current component; the noise component corresponds to the optical noise component.
The filtering unit 200 is configured to obtain a dc component and a noise component in the voltage signal through low-pass filtering; the signal acquisition unit 300 is configured to acquire an alternating current component of the voltage signal by performing a difference process on a direct current component and a noise component of the voltage signal output by the filtering unit 200 and the voltage signal output by the current-voltage conversion unit 100.
The current-voltage conversion unit 100 includes a photosensor D1, a first operational amplifier U1, a first resistor R1, and a second resistor R2. The photoelectric sensor D1 is configured to receive an optical signal and convert the optical signal into a current signal I, and has a negative electrode connected to the inverting input terminal of the first operational amplifier U1 and a positive electrode connected to ground through the first resistor R1. The first operational amplifier U1 is used to convert the current signal into a voltage signal P _ OUT1, which has a non-inverting input terminal also connected to ground through a first resistor R1 and an output terminal fed back to the inverting input terminal of the first operational amplifier U1 through a second resistor R2. In this embodiment, the positive power supply of the first operational amplifier U1 is connected to the operating voltage Vcc, and the negative power supply is directly connected to the GND. Wherein, the first resistor R1 and the second resistor R2 are matched with each other.
Further, in an ideal case, the potential V1 at the non-inverting input terminal 1 and the potential V2 at the inverting input terminal of the first operational amplifier U1 are equal: v1 is equal to V2, and thus, the current signal I generated by the photosensor D1 can be converted into the voltage signal P _ OUT1, and P _ OUT1 is equal to I (R1+ R2), according to the circuit of the current-voltage conversion unit 100. Moreover, since the optical signal received by the photosensor D1 includes an optical signal dc component, an optical signal ac component and an optical noise component, the voltage signal P _ OUT1, which is output after being processed by the first operational amplifier U1 and the current signal I obtained by conversion by the photosensor D1, also includes: an alternating current component of the voltage signal representing an alternating current component of the optical signal; a direct current component of the voltage signal representing a direct current component of the optical signal, and a noise component of the voltage signal representing an optical noise component.
The filtering unit 200 is configured to obtain a direct current component and a noise component of the voltage signal P _ OUT1 through low-pass filtering. In the present embodiment, as shown in fig. 1, the filtering unit 200 includes an RC circuit and a second operational amplifier.
The RC circuit 210 includes a resistor R3 and a capacitor C1, one end of the resistor R3 is connected to the output terminal of the first operational amplifier U1 (the output terminal of the current-voltage conversion unit 100), and the other end is connected to one end of the capacitor C1 and the non-inverting input terminal of the second operational amplifier U2; the other terminal of the capacitor C1 is directly connected to ground. The inverting input terminal of the second operational amplifier U2 is connected to the output terminal thereof, and the output terminal of the second operational amplifier U2 serves as the output terminal of the filtering unit 200. The positive power supply of the second operational amplifier U2 is connected to the operating voltage Vcc, and the negative power supply is directly connected to the GND.
Further, the RC circuit 210 plays a role of low-pass filtering in the filtering unit 200, for obtaining a direct-current component and a noise component of the voltage signal P _ OUT 1; the second operational amplifier U2 is used as a voltage follower for outputting a corresponding signal in real time according to the output value of the RC circuit 210. The values of the third resistor R3 and the capacitor C1 in the RC circuit 210 are both related to the optical signal.
In the present embodiment, the signal acquisition unit 300 is implemented using a differential amplification circuit. Since the value of the current signal I generated by the photo sensor D1 is small, the value of the voltage signal P _ OUT1 generated by the first operational amplifier U1 is correspondingly small, which is inconvenient for the subsequent detection of the photo detection device. Therefore, the signal obtaining unit 300 of the present embodiment differentially amplifies the direct current component and the noise component of the voltage signal P _ OUT1 output from the current-voltage converting unit 100 and the voltage signal P _ OUT1 output from the filtering unit 200 by the differential amplifying circuit, thereby obtaining the alternating current component of the amplified voltage signal P _ OUT 1.
Wherein, differential amplifier circuit includes: a third operational amplifier U3, a fourth resistor R4, a fifth resistor R4, a sixth resistor R6, and a seventh resistor R7.
One end of the fourth resistor R4 is connected to the output terminal of the second operational amplifier U2 (the output terminal of the filter unit 200), and the other end is connected to the inverting input terminal of the third operational amplifier U3 and one end of the seventh resistor R7, respectively. The other end of the seventh resistor R7 is connected to the output terminal of the third operational amplifier U3.
One end of the fifth resistor R5 is connected to the output terminal of the first operational amplifier U1 (the output terminal of the current-voltage conversion unit 100), the other end is connected to the non-inverting input terminal of the third operational amplifier U3 and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is directly grounded.
The output terminal of the third operational amplifier U3 is used as the output terminal of the whole optical signal receiving device, and the output signal thereof is P _ OUT 2. The positive power supply of the third operational amplifier U3 is connected to the operating voltage Vcc and the negative power supply is directly connected to GND.
The fourth resistor R4 and the fifth resistor R5 have the same resistance, and the sixth resistor R6 and the seventh resistor R7 have the same resistance.
By reasonably setting the resistance values of the fourth resistor R4, the fifth resistor R4, the sixth resistor R6 and the seventh resistor R7, the amplification factor of the differential amplification circuit can be adjusted, and the amplification factor of the differential amplification circuit of the embodiment is R5/R6 or R4/R7; a differential operation between the dc component and the noise component of the voltage signal P _ OUT1 output from the current-voltage conversion unit 100 and the voltage signal P _ OUT1 output from the filter unit 200 may be achieved by the third operational amplifier U3.
In addition, in order to highlight the innovative part of the present invention, a unit which is not so closely related to solve the technical problem proposed by the present invention is not introduced in the present embodiment, but this does not indicate that there is no other unit in the present embodiment.
In summary, according to the optical signal receiving apparatus and the photoelectric detection device of the present invention, the electrical signal converted from the optical signal is filtered and differentially processed, so that not only the dc component of the optical signal is removed, but also the basic noise of the light is removed, and finally the stable and reliable ac component of the voltage signal corresponding to the ac component of the optical signal is obtained, so as to further make the detected value more accurate. The circuit of the invention has simple structure, low cost and easy realization, improves the stability and reliability of received optical signals and increases the accuracy of photoelectric detection. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. An optical signal receiving apparatus, comprising: the device comprises a current-voltage conversion unit, a filtering unit and a signal acquisition unit;
the current-voltage conversion unit is used for receiving an optical signal and converting the received optical signal into a voltage signal;
wherein the optical signal comprises an optical signal alternating current component, an optical signal direct current component and an optical noise component; the voltage signal comprises an alternating current component corresponding to the alternating current component of the optical signal, a direct current component corresponding to the direct current component of the optical signal and a noise component corresponding to the optical noise component;
the filtering unit is connected with the output end of the current-voltage conversion unit and is used for acquiring the direct current component and the noise component through low-pass filtering;
the signal acquisition unit is respectively connected with the output end of the current-voltage conversion unit and the output end of the filtering unit, and the voltage signal output by the current-voltage conversion unit and the direct current component and the noise component output by the filtering unit are subjected to differential operation to acquire the alternating current component; the signal acquisition unit adopts a differential amplification circuit, and acquires the amplified alternating current component by differentially amplifying the voltage signal output by the current-voltage conversion unit and the direct current component and the noise component output by the filtering unit.
2. The optical signal receiving apparatus according to claim 1, wherein: the current-voltage conversion unit comprises a photoelectric sensor for receiving the optical signal, a first operational amplifier, a first resistor and a second resistor;
the photoelectric sensor is used for receiving the optical signal and converting the optical signal into a current signal; the negative pole of the first operational amplifier is connected with the inverting input end of the first operational amplifier, and the positive pole of the first operational amplifier is grounded through a first resistor;
the first operational amplifier is used for converting the current signal into the voltage signal; the non-inverting input end of the resistor is grounded through the first resistor; the output end of the first operational amplifier is used as the output end of the current-voltage conversion unit, and the output end of the first operational amplifier is further connected with the inverting input end of the first operational amplifier through the second resistor.
3. The optical signal receiving apparatus according to claim 2, wherein: the first resistor and the second resistor are matched.
4. The optical signal receiving apparatus according to claim 1, wherein: the filtering unit comprises an RC circuit and a second operational amplifier;
the RC circuit comprises a third resistor and a capacitor, one end of the third resistor is connected with the output end of the current-voltage conversion unit, and the other end of the third resistor is respectively connected with one end of the capacitor and the positive phase input end of the second operational amplifier; the other end of the capacitor is grounded;
the output end of the second operational amplifier is used as the output end of the filtering unit, and the output end of the second operational amplifier is also connected with the inverting input end of the second operational amplifier.
5. The optical signal receiving apparatus according to claim 4, wherein: the third resistance and the capacitance are associated with the received optical signal.
6. The optical signal receiving apparatus according to claim 1, wherein: the differential amplification circuit comprises a third operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;
the fourth resistor is connected between the inverting input end of the third operational amplifier and the output end of the filtering unit;
one end of the fifth resistor is connected with the current-voltage conversion unit, and the other end of the fifth resistor is connected with one end of the sixth resistor and the positive phase input end of the third operational amplifier respectively; the other end of the sixth resistor is grounded;
the seventh resistor is connected between the inverting input terminal and the output terminal of the third operational amplifier.
7. The optical signal receiving apparatus according to claim 6, wherein: the fourth resistor and the fifth resistor have the same resistance value; the sixth resistor and the seventh resistor have the same resistance value.
8. The optical signal receiving apparatus according to claim 1, wherein: the operational amplifier adopted in the optical signal receiving device has a positive power supply connected with a working power supply and a negative power supply grounded.
9. A photodetecting device characterized in that: the photoelectric detection device adopts the optical signal receiving device as claimed in any one of claims 1 to 8.
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| CN110515490B (en) * | 2019-08-27 | 2023-05-05 | 广州华欣电子科技有限公司 | Signal processing circuit |
| CN111510112A (en) * | 2020-04-26 | 2020-08-07 | 南京理工大学 | Optical pulse receiving circuit capable of resisting strong light interference |
| CN113670345B (en) * | 2021-08-10 | 2023-09-15 | 之江实验室 | Low-noise photoelectric detection device for photoelectric current signal decomposition |
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