CN104344887A - High-speed large dynamic photoelectric detection device - Google Patents

High-speed large dynamic photoelectric detection device Download PDF

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Publication number
CN104344887A
CN104344887A CN201410593975.XA CN201410593975A CN104344887A CN 104344887 A CN104344887 A CN 104344887A CN 201410593975 A CN201410593975 A CN 201410593975A CN 104344887 A CN104344887 A CN 104344887A
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input
output terminal
comparer
amplifier
module
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CN104344887B (en
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罗志祥
孙伟
柯昌剑
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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Abstract

The invention discloses a high-speed large dynamic photoelectric detection device, comprising a photoelectric detector, an array jumper resistor, a multiplexer switch, an amplifier module, a combined logic module and a preliminary judgment module, wherein an input end of the amplifier module is connected to an output end of the photoelectric detector; the input end of the preliminary judgment module is connected to the output end of the amplifier module; the input end of the combined logic module is connected to the output end of the preliminary judgment module; a control end of the multiplexer switch is connected to the output end of the combined logic module; the input end of the multiplexer switch is connected with the connected end of the photoelectric detector and the amplifier module through the array jumper resistor; the output end of the multiplexer switch is connected to the output end of the amplifier module; a weak optical signal is converted into a corresponding current signal through a high-speed photoelectric detector; a corresponding voltage signal is output from the current signal through the amplifier module and the array jumper resistor; the voltage signal is processed by the preliminary judgment module; a digital signal is output to the combined logic module; the high-speed multiplexer switch is switched into corresponding range at a time after logic selection of the combined logic module.

Description

A kind of high speed Larger Dynamic photoelectric detection system
Technical field
The invention belongs to technical field of photoelectricity test, more specifically, relate to a kind of photoelectric detection system.
Background technology
Photoelectric detecting technology is the cutting edge technology in China's sciemtifec and technical sphere, has been deep into numerous scientific domain.The progress of any scientific domain none be not depend on the measurement to studied object, the fast development of fiber optic communication field is no exception, so also increase fast the demand of photoelectricity test instrument.As the representative of sensed light signal power---light power meter, it is a kind of optical gauge of precision, be widely used in numerous high-technology fields such as optical communication, Experiments of Optics, biomedicine, especially, in fiber optic communication field, it is test light power, the requisite surveying instrument of light decrement.
But present domestic required light power meter is mostly from import, and external light power meter is expensive, and also have this series products although domestic, some index can not meet demand.The 843-R power meter that Newport company produces, dynamic range, from a few nW to 2W, reaches 90dB, but speed can only reach 15 times/second, and price but reaches several thousand dollars; The dynamic range of the high-speed power meter PM-1600 that EXFO company produces can to about 90dB, but its speed also can only arrive ms magnitude.
Prior art provides a kind of light power meter, is to utilize micro-control unit (as single-chip microcomputer) to control program control range switch circuit, thus controls the enlargement factor of pre-amplification circuit, obtain Larger Dynamic effect, but speed is slow.
Usually, the switching of range, by to the light signal after front-end processing, first carry out analog to digital conversion, output digit signals passes to digital processing element or microprocessing unit, then by comparing with the data that in house software is arranged, just can be switched to corresponding range, what have perhaps will carry out repeatedly analog to digital conversion, comparison and switching, so be difficult to reach high effect.
Summary of the invention
For the defect of prior art, the object of the present invention is to provide a kind of photoelectric detection system, be intended to solve prior art and cause reaching problem at a high speed owing to adopting the mode of software to compare and switching.
The invention provides a kind of photoelectric detection system, comprise photodetector, array cross-over connection resistance, multidiameter option switch, amplification module, combinational logic module and pre-determination module; The input end of described amplification module is connected to the output terminal of described photodetector, the input end of described pre-determination module is connected to the output terminal of described amplification module, the input end of described combinational logic module is connected to the output terminal of described pre-determination module, the control end of described multidiameter option switch is connected to the output terminal of described combinational logic module, and the input end of described multidiameter option switch is connected to by described array cross-over connection resistance the link that described photodetector is connected with described amplification module; The output terminal of described multidiameter option switch is connected to the output terminal of described amplification module; Described pre-determination module is used for directly judging the voltage that amplification module exports, and for controlling, multidiameter option switch is disposable is switched to corresponding range to output digit signals; Described combinational logic module, after 4 position digital signals exported by pre-determination module carry out combinational logic selection, is converted into 3 position digital signals, and for controlling, multidiameter option switch is disposable is switched to corresponding range.
Wherein, on the decision method of range, adopt the pure hardware circuit of pre-determination module and combined logic block composition to realize, postpone little, the transmission time is short.
Wherein, described pre-determination module comprises: the first comparer, the second comparer, the first amplifier, the 3rd comparer, the second amplifier, the 4th comparer, the first single-pole single-throw (SPST) multidiameter option switch K1, the second single-pole single-throw (SPST) multidiameter option switch K2, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4; The first input end of described first comparer is connected to the output terminal of described amplification module, and second of described first comparer enters end for receiving the first voltage; The first input end of described second comparer is connected to the output terminal of described amplification module, and second of described second comparer enters end for receiving the second voltage; The normal phase input end of described first amplifier is connected to the first input end of described second comparer by described first single-pole single-throw (SPST) multidiameter option switch K1; The inverting input of described first amplifier is by described first resistance R1 ground connection, and the inverting input of described first amplifier is also connected to the output terminal of described first amplifier by described second resistance R2; The first input end of described 3rd comparer is connected to the output terminal of described first amplifier, and the second input end of described 3rd comparer is for receiving the second voltage; The normal phase input end of described second amplifier is connected to the output terminal of described first amplifier by described second single-pole single-throw (SPST) multidiameter option switch K2; The reverse input end of described second amplifier is by described 3rd resistance R3 ground connection, and the reverse input end of described second amplifier is also connected to the output terminal of described second amplifier by described 4th resistance R4; The first input end of described 4th comparer is connected to the output terminal of described second amplifier, and the second input end of described 4th comparer is for connecting described second voltage; The control end of described first single-pole single-throw (SPST) multidiameter option switch K1 is connected to the output terminal of described second comparer, and the control end of described second single-pole single-throw (SPST) multidiameter option switch K2 is connected to the output terminal of described 3rd comparer.
Wherein, the resistance of described second resistance R2 is 9 times of the resistance of described first resistance R1; The resistance of described 4th resistance R4 is 9 times of the resistance of described 3rd resistance R3.
Wherein, the value of described first voltage is 10 times of the value of the second voltage.
Wherein, described combinational logic module comprises not gate or door, first and door and second and door; Described first with the first input end of door for being connected the output terminal b of described second comparer, described first with the second input end of door for being connected the output terminal c of described 3rd comparer; Described first is connected to the first control end of multidiameter option switch with the output terminal of door; The output terminal b of described second comparer is connected to the second control end of multidiameter option switch; The input end of described not gate is for connecting the output terminal d of described 4th comparer, described second is connected to the output terminal of described not gate with the first input end of door, described second is connected to the output terminal b of described second comparer with the second input end of door, first input end that is described or door is connected to the output terminal of described second and door, and the second input end that is described or door is connected to the output terminal a of described first comparer; Output terminal that is described or door is connected to the 3rd control end of described multidiameter option switch.
Wherein, described array cross-over connection resistance comprises the resistance of multiple arranged in arrays, and the resistance of multiple resistance is successively according to 10 times of increasing or decreasings.
The present invention utilizes that the high speed of the pre-determination module of hardware is adjudicated, the logic of combinational logic module is selected, the high speed of high-speed, multi-path selector switch switches and array cross-over connection resistance, realizes high speed Larger Dynamic effect; Replace soft decision with hardware judgement, and the voltage signal after amplifying from current/voltage amplification module, directly enter the pre-determination module of hardware, do not need to carry out the switching that analog to digital conversion and comparison remove to control range.
Accompanying drawing explanation
Fig. 1 is the modular structure schematic diagram of the photoelectric detection system that the embodiment of the present invention provides;
Fig. 2 is the circuit diagram of the photoelectric detection system that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of high speed Larger Dynamic photoelectric detection system; Utilize that the high speed of the pre-determination module of hardware is adjudicated, the logic of combinational logic module is selected, the high speed of high-speed, multi-path selector switch switches and array cross-over connection resistance, realize high speed Larger Dynamic effect; Replace soft decision with hardware judgement, and the voltage signal after amplifying from current/voltage amplification module, directly enter the pre-determination module of hardware, do not need to carry out the switching that analog to digital conversion and comparison remove to control range.
Fig. 1 is the structural representation of the embodiment of the present invention, and it comprises high-speed photodetector 1, array cross-over connection resistance 2, high-speed, multi-path selector switch 3, current/voltage amplification module 4, pre-determination module 6 and combinational logic module 5; The input end of amplification module 4 is connected to the output terminal of photodetector 1, the input end of pre-determination module 6 is connected to the output terminal of amplification module 4, the input end of combinational logic module 5 is connected to the output terminal of pre-determination module 6, the control end of multidiameter option switch 3 is connected to the output terminal of combinational logic module 5, and the input end of multidiameter option switch 3 is connected to by array cross-over connection resistance 2 link that photodetector 1 is connected with amplification module 4; The output terminal of multidiameter option switch 3 is connected to the output terminal of amplification module 4.
Wherein faint optical signal is converted to corresponding current signal by high-speed photodetector 1, current signal is by current/voltage amplification module 4 and array cross-over connection resistance 2, export corresponding voltage signal, voltage signal is through pre-determination module 6, output digit signals is to combinational logic module 5, after combinational logic module 5 logic is selected, make that high-speed, multi-path selector switch 3 is disposable is switched to corresponding range.
In the embodiment of the present invention, voltage signal after current/voltage amplification module amplifies, directly through the pre-determination module process of hardware, the digital signal exported passes to combinational logic module fast, after combinational logic module logic is selected, make that high-speed, multi-path selector switch is disposable to be switched on corresponding array cross-over connection resistance, and do not carry out the switching that analog to digital conversion and comparison remove to control range, thus reach the effect of high speed Larger Dynamic.
As one embodiment of the present of invention, Electro-Optical Sensor Set also comprises the analog-to-digital conversion module of the output terminal being connected to amplification module 4, for the voltage signal after amplification is converted to digital signal, then does other subsequent treatment.
As one embodiment of the present of invention, multidiameter option switch 3 adopts high-speed, multi-path selector switch, and be multiselect one multiplexer, conducting resistance is little or be almost 0, and switching time is 10ns magnitude.Fig. 2 shows the physical circuit of the Electro-Optical Sensor Set that the embodiment of the present invention provides, and comprises high-speed photodetector 1, array cross-over connection resistance 2, high-speed, multi-path selector switch 3, amplification module 4, combinational logic module 5 and pre-determination module 6.
Pre-determination module 6 comprises: the first comparer 61, second comparer 62, first amplifier 63, the 3rd comparer 64, second amplifier 65, the 4th comparer 66, first single-pole single-throw (SPST) multidiameter option switch K1, the second single-pole single-throw (SPST) multidiameter option switch K2, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4; The first input end of the first comparer 61 is connected to the output terminal of amplification module 4, and second of the first comparer 61 enters end for receiving the first voltage; The first input end of described second comparer 62 is connected to the output terminal of described amplification module 4, and second of described second comparer 62 enters end for receiving the second voltage; The normal phase input end of described first amplifier 63 is connected to the first input end of described second comparer 62 by described first single-pole single-throw (SPST) multidiameter option switch K1; The inverting input of described first amplifier 63 is by described first resistance R1 ground connection, and the inverting input of described first amplifier 63 is also connected to the output terminal of described first amplifier 63 by described second resistance R2; The first input end of described 3rd comparer 64 is connected to the output terminal of described first amplifier 63, and the second input end of described 3rd comparer 64 is for receiving the second voltage; The positive 5 phase input ends of described second amplifier 6 are connected to the output terminal of described first amplifier 63 by described second single-pole single-throw (SPST) multidiameter option switch K2; The reverse input end of described second amplifier 65 is by described 3rd resistance R3 ground connection, and the reverse input end of described second amplifier 65 is also connected to the output terminal of described second amplifier 65 by described 4th resistance R4; The first input end of described 4th comparer 66 is connected to the output terminal of described second amplifier 65, and the second input end of described 4th comparer 66 is for connecting described second voltage; The control end of described first single-pole single-throw (SPST) multidiameter option switch K1 is connected to the output terminal of described second comparer 62, and the control end of described second single-pole single-throw (SPST) multidiameter option switch K2 is connected to the output terminal of described 3rd comparer 64.
Wherein, the resistance of the second resistance R2 is 9 times of the resistance of described first resistance R1; The resistance of described 4th resistance R4 is 9 times of the resistance of described 3rd resistance R3.The value of the first voltage is 10 times of the value of the second voltage.
In embodiments of the present invention, combinational logic module 5 comprises not gate or door, first and door and second and door; Described first with the first input end of door for being connected the output terminal b of described second comparer 62, described first with the second input end of door for being connected the output terminal c of the 3rd comparer 64; First is connected to the first control end of multidiameter option switch with the output terminal of door; The output terminal b of the second comparer 62 is connected to the second control end of multidiameter option switch; The input end of not gate is for connecting the output terminal d of the 4th comparer 66, second is connected to the output terminal of not gate with the first input end of door, second is connected to the output terminal b of the second comparer 62 with the second input end of door, or the first input end of door is connected to the output terminal of second and door, or the second input end of door is connected to the output terminal a of the first comparer 61; Or the output terminal of door is connected to the 3rd control end of multidiameter option switch.
In embodiments of the present invention, the first comparer 61, second comparer 62, the 3rd comparer 64 and the 4th comparer 66 all adopt high-speed comparator, and output delay time is ns level.
As one embodiment of the present of invention, array cross-over connection resistance 2 comprises 5 road resistance, and range increases progressively, from 1K to 10M by 10 times; Pre-determination module 6 is made up of 4 high-speed comparators, 2 single-pole single-throw (SPST) multidiameter option switchs, 2 amplifiers and 4 resistance; Combinational logic module comprise 1 not gate, 2 with door and 1 or.In pre-determination module 6, "+" end of high-speed comparator 1, "-" end of high-speed comparator 2 and single-pole single-throw (SPST) multidiameter option switch 1 left end connect the output terminal of amplification module; "-" termination 1V reference voltage of high-speed comparator 1, "+" termination 0.1V of high-speed comparator 2; The output terminal of high-speed comparator 1 directly exports as digital signal a; High-speed comparator 2 output terminal, exports as digital signal b on the one hand, on the other hand as the control end of single-pole single-throw (SPST) multidiameter option switch 1; The right-hand member of single-pole single-throw (SPST) multidiameter option switch 1 connects "+" end of amplifier 1, as the positive input of amplifier 1; "-" terminating resistor R of amplifier 1 and resistance 9R, the output terminal of amplifier 1, connect "-" end of high-speed comparator 3 on the one hand, the left end of order single-pole single-throw multidiameter option switch 2, simultaneously connecting resistance 9R, realize 10 times of amplifications of forward input on the other hand; "+" termination reference voltage 0.1V of high-speed comparator 3, its output terminal, on the one hand as digital signal c, on the other hand as the control end of single-pole single-throw (SPST) multidiameter option switch 2, control amplifier 1 output voltage receives "+" end of amplifier 2; "-" terminating resistor R of amplifier 2 and resistance 9R, it exports "-" end and the resistance 9R of termination high-speed comparator 4, and function is with amplifier 1; "+" termination reference voltage 0.1V of high-speed comparator 4, it exports as digital signal d.In combinational logic module, digital signal b and digital signal c by with door 1 after, output digit signals A is to high-speed, multi-path selector switch; Digital signal b directly outputs to high-speed, multi-path selector switch as an independent road; Digital signal d exports through a not gate, then with digital signal b through and door 2, then with digital signal a through one or, output digit signals C is to high-speed, multi-path selector switch.
In the embodiment of the present invention, the electric current that high-speed photodetector 1 exports is from nA level to mA level, under original state, high-speed, multi-path selector switch 3 connects 10K shelves, now after amplification module amplifies, the voltage range obtained is from tens uV to tens V, but the supply voltage of amplifier only has 5V, so voltage range narrows down to tens uV to 5V; Voltage after amplification module amplifies, export analog-to-digital conversion module and pre-determination module to, the switching time of analog-to-digital conversion module is at tens more than ns, and in pre-determination module, the high-speed comparator processing time only has a few ns (as MAX9012 only has 5ns), single-pole single-throw (SPST) multidiameter option switch (as ADG901) switching time and amplifier need the time also to only have a few ns, so whole pre-determination module needs the time to be less than the time of analog-to-digital conversion module; In pre-determination module, input voltage is often through a high-speed comparator, capital exports a digital signal to combinational logic module, label is a, b, c, d successively, combinational logic module controls high-speed, multi-path selector switch by abcd 4-digit number signal, realizes disposablely being switched to corresponding range.Following table is the best cross-over connection resistance that anticipation corresponding to different range ability is determined module results and high-speed, multi-path selector switch and needed to be switched to.
Note: 0 represents low level; 1 represents high level; X represents uncertain
Whole process is set forth below for 200uA and 20nA:
When high-speed photodetector output current is 200uA, because acquiescence selects 10K cross-over connection resistance, now after amplification module amplifies, voltage is 2V, preferentially enters pre-determination module, judge through high-speed comparator 1 and high-speed comparator 2, result is a=1, b=0, now, after combinational logic module logic is selected, high-speed, multi-path selector switch is switched to 1K shelves, output voltage is 0.2V, and this voltage after analog-to-digital conversion module conversion digital signal, then does subsequent treatment;
When high-speed photodetector output current is 20nA, after amplification module amplifies, voltage is 0.2mV, preferentially enter pre-determination module, judge through high-speed comparator 1 and high-speed comparator 2, result is a=0, b=1, now single-pole single-throw (SPST) multidiameter option switch 1 conducting, voltage transmission is to amplifier 1, after amplifying 10 times, voltage is 2mV, compare with high-speed comparator 3, result is c=1, now single-pole single-throw (SPST) multidiameter option switch 2 conducting, through amplifier 1 amplify voltage transmission to amplifier 2, after amplifying 10 times, voltage is 20mV, compare with high-speed comparator, result is d=1, now abcd 4-digit number signal is after the process of combinational logic module logic, high-speed, multi-path selector switch is made to be switched to 10M shelves fast, the voltage amplified through amplification module is 0.2V, this voltage is after analog-to-digital conversion module conversion digital signal, do subsequent treatment again.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (2)

1. a photoelectric detection system, it is characterized in that, comprise photodetector (1), array cross-over connection resistance (2), multidiameter option switch (3), amplification module (4), combinational logic module (5) and pre-determination module (6);
The input end of described amplification module (4) is connected to the output terminal of described photodetector (1), the input end of described pre-determination module (6) is connected to the output terminal of described amplification module (4), the input end of described combinational logic module (5) is connected to the output terminal of described pre-determination module (6), the control end of described multidiameter option switch (3) is connected to the output terminal of described combinational logic module (5), the input end of described multidiameter option switch (3) is connected to by described array cross-over connection resistance (2) link that described photodetector (1) is connected with described amplification module (4), the output terminal of described multidiameter option switch (3) is connected to the output terminal of described amplification module (4),
Described pre-determination module (6) is for directly judging the voltage that amplification module (4) exports, and for controlling, multidiameter option switch (3) is disposable is switched to corresponding range to output digit signals; Described combinational logic module (5), after 4 position digital signals exported by pre-determination module carry out combinational logic selection, is converted into 3 position digital signals, and for controlling, multidiameter option switch (3) is disposable is switched to corresponding range.
2. photoelectric detection system as claimed in claim 1, it is characterized in that, described pre-determination module (6) comprising: the first comparer (61), the second comparer (62), the first amplifier (63), the 3rd comparer (64), the second amplifier (65), the 4th comparer (66), the first single-pole single-throw (SPST) multidiameter option switch K1, the second single-pole single-throw (SPST) multidiameter option switch K2, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4;
The first input end of described first comparer (61) is connected to the output terminal of described amplification module (4), and second of described first comparer (61) enters end for receiving the first voltage;
The first input end of described second comparer (62) is connected to the output terminal of described amplification module (4), and second of described second comparer (62) enters end for receiving the second voltage;
The normal phase input end of described first amplifier (63) is connected to the first input end of described second comparer (62) by described first single-pole single-throw (SPST) multidiameter option switch K1; The inverting input of described first amplifier (63) is by described first resistance R1 ground connection, and the inverting input of described first amplifier (63) is also connected to the output terminal of described first amplifier (63) by described second resistance R2;
The first input end of described 3rd comparer (64) is connected to the output terminal of described first amplifier (63), and the second input end of described 3rd comparer (64) is for receiving the second voltage;
The normal phase input end of described second amplifier (65) is connected to the output terminal of described first amplifier (63) by described second single-pole single-throw (SPST) multidiameter option switch K2; The reverse input end of described second amplifier (65) is by described 3rd resistance R3 ground connection, and the reverse input end of described second amplifier (65) is also connected to the output terminal of described second amplifier (65) by described 4th resistance R4;
The first input end of described 4th comparer (66) is connected to the output terminal of described second amplifier (65), and the second input end of described 4th comparer (66) is for connecting described second voltage;
The control end of described first single-pole single-throw (SPST) multidiameter option switch K1 is connected to the output terminal of described second comparer (62), and the control end of described second single-pole single-throw (SPST) multidiameter option switch K2 is connected to the output terminal of described 3rd comparer (64).
CN201410593975.XA 2014-10-29 2014-10-29 A kind of high speed Larger Dynamic photoelectric detection system Active CN104344887B (en)

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