CN210243723U - Oscilloscope for light sampling - Google Patents
Oscilloscope for light sampling Download PDFInfo
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- CN210243723U CN210243723U CN201920842406.2U CN201920842406U CN210243723U CN 210243723 U CN210243723 U CN 210243723U CN 201920842406 U CN201920842406 U CN 201920842406U CN 210243723 U CN210243723 U CN 210243723U
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Abstract
The utility model discloses an oscilloscope for light sampling, including power strip, photoelectric converter, sampling clock board and digital control board are connected with the power strip respectively, photoelectric converter is connected with the sampling clock board, the sampling clock board is connected with the digital control board electricity, the sampling clock board further includes first radio frequency connector, second radio frequency connector, sampling holder, analog-to-digital converter, buffer memory unit and clock processing circuit, it has a sampling resistor to establish ties on the photoelectric converter, and this sampling resistor one end is connected with photoelectric converter, and the other end is connected with a first switch, a second switch and sampling resistor and first switch parallel connection. The utility model discloses can all detect after going up the electricity at every turn, eliminate the influence that dark current brought, reduce at every turn because the error that other noises brought between the test when guaranteeing the measuring accuracy, further improve sampling oscilloscope's detection precision.
Description
Technical Field
The utility model relates to an oscilloscope belongs to communication equipment technical field.
Background
The oscilloscope is an electronic measuring instrument with wide application. It can convert the invisible electric signal into visible image, and is convenient for people to research the change process of various electric phenomena. The photodiode used in the oscilloscope operates under the action of reverse voltage, reverse current can be rapidly increased when the oscilloscope is illuminated, and weak dark current can be generated when the oscilloscope is not illuminated. The dark current range is probably in the nA level, and detection of such current levels has been difficult, especially in situations where cost is limited and external calibration is inconvenient. The current method used in the industry is to test the device by adding extra output circuits and then compensate in software. The method of compensating by adding additional equipment brings additional equipment requirements, is inconvenient for field use, and the relevant parameters can have certain drift along with the aging of the detection circuit.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an oscilloscope for light sampling, it can all detect after going up the electricity at every turn, eliminates the influence that dark current brought, reduces the error because other noises bring between the test at every turn when guaranteeing the measuring accuracy, further improves the measuring accuracy of sampling oscilloscope.
In order to achieve the above purpose, the utility model adopts the technical scheme that: an oscilloscope for optical sampling comprises a power panel, a photoelectric converter, a sampling clock panel and a digital control panel, wherein the photoelectric converter, the sampling clock panel and the digital control panel are respectively connected with the power panel;
the sampling clock board further comprises a first radio frequency connector, a second radio frequency connector, a sampling holder, an analog-to-digital converter, a cache unit and a clock processing circuit, wherein the clock processing circuit is respectively connected with the sampling holder and the analog-to-digital converter, one end of the cache unit is connected with the analog-to-digital converter, and the other end of the cache unit is connected with the digital control board;
the first radio frequency connector is used for receiving an electric signal from the photoelectric converter, the first radio frequency connector is used for receiving a clock signal from the outside, the clock signal is transmitted to a splitter through a frequency divider, and the splitter splits the clock signal into a first clock signal transmitted to the clock processing circuit and a second clock signal transmitted to the digital control board;
the photoelectric converter is connected with a sampling resistor in series, one end of the sampling resistor is connected with the photoelectric converter, the other end of the sampling resistor is connected with a first switch, and a second switch is connected with the sampling resistor and the first switch in parallel;
the photoelectric converter, the sampling resistor and the first switch form a first loop, the photoelectric converter and the second switch form a second loop, two ends of the sampling resistor are respectively connected with a first analog-to-digital conversion module and a second analog-to-digital conversion module, and the first analog-to-digital conversion module and the second analog-to-digital conversion module are respectively connected with the digital control board.
The further improved scheme in the technical scheme is as follows:
1. in the above scheme, one end of the photoelectric converter is connected in series with a bias voltage module.
2. In the above scheme, an amplifier is respectively arranged between the first analog-to-digital conversion module, the second analog-to-digital conversion module and the sampling resistor.
Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:
1. the utility model relates to an oscilloscope used for light sampling, a sampling resistor is connected in series on a photoelectric converter, one end of the sampling resistor is connected with the photoelectric converter, the other end is connected with a first switch, a second switch is connected with the sampling resistor and the first switch in parallel, the photoelectric converter, the sampling resistor and the first switch form a first loop, the photoelectric converter and the second switch form a second loop, the two ends of the sampling resistor are respectively connected with a first analog-to-digital conversion module and a second analog-to-digital conversion module, the first analog-to-digital conversion module and the second analog-to-digital conversion module are respectively connected with a digital control panel, a simple and easy-to-use method for detecting the dark current of the photoelectric converter is provided, the influence of the dark current on the sampling oscilloscope is eliminated, the detection precision of the sampling oscilloscope when inputting low light power signals is improved, the operation is simple and easy-to use, the detection can be carried out after each time of electrifying and the, the influence brought by dark current is eliminated, the testing precision is ensured, meanwhile, the error caused by other noises between each testing is reduced, and the detection precision of the sampling oscilloscope is further improved.
2. The utility model relates to an oscilloscope for optical sampling, wherein a sampling clock board further comprises a first radio frequency connector, a second radio frequency connector, a sampling retainer, an analog-to-digital converter, a buffer memory unit and a clock processing circuit, the clock processing circuit is respectively connected with the sampling holder and the analog-to-digital converter, one end of the buffer unit is connected with the analog-to-digital converter, the other end of the buffer unit is connected with the digital control board, the first radio frequency connector is used for receiving an electric signal from the photoelectric converter, the first radio frequency connector is used for receiving a clock signal from the outside, the clock signal is transmitted to a splitter through a frequency divider, the splitter divides the clock signal into a first clock signal transmitted to the clock processing circuit and a second clock signal transmitted to the digital control board, and the detection precision of the sampling oscilloscope is further ensured by adopting an external clock signal.
Drawings
FIG. 1 is a schematic diagram of an oscilloscope used for light sampling according to the present invention;
figure 2 is the utility model discloses an oscilloscope partial structure electrical schematic for light sampling.
In the above drawings: 1. a power panel; 2. a photoelectric converter; 3. sampling a clock board; 301. a first radio frequency connector; 302. a second radio frequency connector; 303. a sample holder; 304. an analog-to-digital converter; 305. a buffer unit; 306. a clock processing circuit; 307. a frequency divider; 308. a splitter; 4. a digital control panel; 5. sampling a resistor; 6. a first switch; 7. a second switch; 8. a first analog-to-digital conversion module; 9. a second analog-to-digital conversion module; 10. a bias voltage module; 11. an amplifier.
Detailed Description
In order to further explain the technical solution of the patent, the patent is explained in detail by the following specific examples.
In the description of this patent, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the positional or orientational relationships illustrated in the drawings to facilitate the description of the patent and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the patent. In the description of this patent, unless otherwise indicated, "a plurality" means two or more.
Example 1: an oscilloscope for optical sampling comprises a power panel 1, a photoelectric converter 2, a sampling clock panel 3 and a digital control panel 4, wherein the photoelectric converter 2, the sampling clock panel 3 and the digital control panel 4 are respectively connected with the power panel 1, the photoelectric converter 2 is connected with the sampling clock panel 3, and the sampling clock panel 3 is electrically connected with the digital control panel 4;
the sampling clock board 3 further comprises a first radio frequency connector 301, a second radio frequency connector 302, a sampling holder 303, an analog-to-digital converter 304, a buffer unit 305 and a clock processing circuit 306, wherein the clock processing circuit 306 is respectively connected with the sampling holder 303 and the analog-to-digital converter 304, one end of the buffer unit 305 is connected with the analog-to-digital converter 304, and the other end is connected with the digital control board 4;
the first rf connector 301 is used for receiving the electrical signal from the optical-to-electrical converter 2, the first rf connector 301 is used for receiving the clock signal from the outside, the clock signal is transmitted to a splitter 308 through a frequency divider 307, and the splitter 308 splits the clock signal into a first clock signal transmitted to the clock processing circuit 306 and a second clock signal transmitted to the digital control board 4;
a sampling resistor 5 is connected in series on the photoelectric converter 2, one end of the sampling resistor 5 is connected with the photoelectric converter 2, the other end of the sampling resistor 5 is connected with a first switch 6, and a second switch 7 is connected with the sampling resistor 5 and the first switch 6 in parallel;
the photoelectric converter 2, the sampling resistor 5 and the first switch 6 form a first loop, the photoelectric converter 2 and the second switch 7 form a second loop, two ends of the sampling resistor 5 are respectively connected with a first analog-to-digital conversion module 8 and a second analog-to-digital conversion module 9, and the first analog-to-digital conversion module 8 and the second analog-to-digital conversion module 9 are respectively connected with the digital control board 4.
One end of the photoelectric converter 2 is connected in series with a bias voltage module 10.
Example 2: an oscilloscope for optical sampling comprises a power panel 1, a photoelectric converter 2, a sampling clock panel 3 and a digital control panel 4, wherein the photoelectric converter 2, the sampling clock panel 3 and the digital control panel 4 are respectively connected with the power panel 1, the photoelectric converter 2 is connected with the sampling clock panel 3, the sampling clock panel 3 is electrically connected with the digital control panel 4, the photoelectric converter 2 receives an external optical signal to be tested, converts the optical signal into an electrical signal and sends the electrical signal to a first radio frequency connector 301;
the sampling clock board 3 further comprises a first radio frequency connector 301, a second radio frequency connector 302, a sampling holder 303, an analog-to-digital converter 304, a buffer unit 305 and a clock processing circuit 306, wherein the clock processing circuit 306 is respectively connected with the sampling holder 303 and the analog-to-digital converter 304, one end of the buffer unit 305 is connected with the analog-to-digital converter 304, and the other end is connected with the digital control board 4;
the first rf connector 301 is used for receiving the electrical signal from the optical-to-electrical converter 2, the first rf connector 301 is used for receiving the clock signal from the outside, the clock signal is transmitted to a splitter 308 through a frequency divider 307, and the splitter 308 splits the clock signal into a first clock signal transmitted to the clock processing circuit 306 and a second clock signal transmitted to the digital control board 4;
a sampling resistor 5 is connected in series on the photoelectric converter 2, one end of the sampling resistor 5 is connected with the photoelectric converter 2, the other end of the sampling resistor 5 is connected with a first switch 6, and a second switch 7 is connected with the sampling resistor 5 and the first switch 6 in parallel;
the photoelectric converter 2, the sampling resistor 5 and the first switch 6 form a first loop, the photoelectric converter 2 and the second switch 7 form a second loop, two ends of the sampling resistor 5 are respectively connected with a first analog-to-digital conversion module 8 and a second analog-to-digital conversion module 9, and the first analog-to-digital conversion module 8 and the second analog-to-digital conversion module 9 are respectively connected with the digital control board 4.
An amplifier 11 is respectively arranged between the first analog-to-digital conversion module 8, the second analog-to-digital conversion module 9 and the sampling resistor 5.
When the oscilloscope for optical sampling is adopted, the method for detecting the dark current of the photoelectric converter is simple and easy to use, the influence of the dark current on the sampling oscilloscope is eliminated, the detection precision of the sampling oscilloscope when a low-light-power signal is input is improved, the operation is simple and easy to use, the detection can be carried out after each power-on, the difference value is compensated, the influence caused by the dark current is eliminated, the testing precision is ensured, meanwhile, the error caused by other noises between each test is reduced, and the detection precision of the sampling oscilloscope is further improved;
in addition, an external clock signal is adopted, so that the detection precision of the sampling oscilloscope is further ensured.
When the voltage difference calculation device is used, the second switch is closed, the first switch is disconnected, and numerical values ADC1 and ADC2 of the first analog-to-digital conversion module and the second analog-to-digital conversion module are respectively collected, and at the moment, no current passes through the sampling resistor, so that the voltage difference VD1 calculated by the difference value of the ADC1 and the ADC2 is the self-deviation of the system; then the second switch is disconnected, the first switch is closed, numerical values ADC1 and ADC2 of the first analog-to-digital conversion module and the second analog-to-digital conversion module are respectively collected, and a difference value between the ADC1 and the ADC2 is obtained to calculate a voltage deviation VD 2; subtracting VD1 from VD2 to obtain a voltage difference VD3 generated by the current actually passing through the sampling resistor; the dark current I = VD3/R of the photoelectric converter was obtained.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (3)
1. An oscilloscope for light sampling, comprising: the photoelectric sampling device comprises a power panel (1), a photoelectric converter (2), a sampling clock panel (3) and a digital control panel (4), wherein the photoelectric converter (2), the sampling clock panel (3) and the digital control panel (4) are respectively connected with the power panel (1), the photoelectric converter (2) is connected with the sampling clock panel (3), and the sampling clock panel (3) is electrically connected with the digital control panel (4);
the sampling clock board (3) further comprises a first radio frequency connector (301), a second radio frequency connector (302), a sampling holder (303), an analog-to-digital converter (304), a buffer unit (305) and a clock processing circuit (306), wherein the clock processing circuit (306) is respectively connected with the sampling holder (303) and the analog-to-digital converter (304), one end of the buffer unit (305) is connected with the analog-to-digital converter (304), and the other end of the buffer unit (305) is connected with the digital control board (4);
the first radio frequency connector (301) is used for receiving an electric signal from the photoelectric converter (2), the first radio frequency connector (301) is used for receiving a clock signal from the outside, the clock signal is transmitted to a splitter (308) through a frequency divider (307), and the splitter (308) splits the clock signal into a first clock signal transmitted to a clock processing circuit (306) and a second clock signal transmitted to a digital control board (4);
a sampling resistor (5) is connected in series on the photoelectric converter (2), one end of the sampling resistor (5) is connected with the photoelectric converter (2), the other end of the sampling resistor (5) is connected with a first switch (6), and a second switch (7) is connected with the sampling resistor (5) and the first switch (6) in parallel;
photoelectric converter (2) and sampling resistor (5), first switch (6) form first return circuit, photoelectric converter (2) and second switch (7) form the second return circuit, sampling resistor (5) both ends are connected with first analog-to-digital conversion module (8), second analog-to-digital conversion module (9) respectively, and this first analog-to-digital conversion module (8) and second analog-to-digital conversion module (9) are connected with digital control board (4) respectively.
2. The oscilloscope for light sampling according to claim 1, wherein: one end of the photoelectric converter (2) is connected with a bias voltage module (10) in series.
3. The oscilloscope for light sampling according to claim 1, wherein: an amplifier (11) is respectively arranged between the first analog-to-digital conversion module (8), the second analog-to-digital conversion module (9) and the sampling resistor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920842406.2U CN210243723U (en) | 2019-06-05 | 2019-06-05 | Oscilloscope for light sampling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920842406.2U CN210243723U (en) | 2019-06-05 | 2019-06-05 | Oscilloscope for light sampling |
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| CN210243723U true CN210243723U (en) | 2020-04-03 |
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| CN201920842406.2U Active CN210243723U (en) | 2019-06-05 | 2019-06-05 | Oscilloscope for light sampling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114624490A (en) * | 2022-03-11 | 2022-06-14 | 苏州联讯仪器有限公司 | Photoelectric conversion and sample hold direct current coupling interconnection device of optical sampling oscilloscope |
| CN115060947A (en) * | 2022-07-27 | 2022-09-16 | 苏州联讯仪器有限公司 | Sampling oscilloscope front end device and sampling oscilloscope |
-
2019
- 2019-06-05 CN CN201920842406.2U patent/CN210243723U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114624490A (en) * | 2022-03-11 | 2022-06-14 | 苏州联讯仪器有限公司 | Photoelectric conversion and sample hold direct current coupling interconnection device of optical sampling oscilloscope |
| CN114624490B (en) * | 2022-03-11 | 2022-11-15 | 苏州联讯仪器有限公司 | Photoelectric conversion and sample hold direct current coupling interconnection device of optical sampling oscilloscope |
| CN115060947A (en) * | 2022-07-27 | 2022-09-16 | 苏州联讯仪器有限公司 | Sampling oscilloscope front end device and sampling oscilloscope |
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Address after: Building 5, No. 1508, Xiangjiang Road, Suzhou High-tech Zone, Suzhou City, Jiangsu Province 215129 Patentee after: Suzhou Lianxun Instrument Co.,Ltd. Address before: Building 5, No. 1508, Xiangjiang Road, High-tech Zone, Suzhou City, Jiangsu Province, 215011 Patentee before: STELIGHT INSTRUMENT Inc. |