CN103438996B - A kind of self-correcting testing circuit of utmost point faint optical signal - Google Patents
A kind of self-correcting testing circuit of utmost point faint optical signal Download PDFInfo
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- CN103438996B CN103438996B CN201310412597.6A CN201310412597A CN103438996B CN 103438996 B CN103438996 B CN 103438996B CN 201310412597 A CN201310412597 A CN 201310412597A CN 103438996 B CN103438996 B CN 103438996B
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Abstract
The present invention relates to a kind of self-correcting testing circuit of utmost point faint optical signal, it is characterized in that: comprise a controllable light source, one optical fiber, one photoelectric conversion unit, one amplifying unit and a central processing unit, described in described central processing unit control, after one scheduled time of controllable light source fluorescence excitation, close described controllable light source, described central processing unit receives the signal in described amplifying unit and itself and a preset value is compared to judge that whether described amplifying unit is in amplifier linear work district, if do not rejudge in amplifier linear work district changes the duty of described amplifying unit by described central processing unit after, if carry out sampled measurements fluorescence signal in amplifier linear work district. the present invention can realize the accurate measurement of utmost point faint optical signal, and has high s/n ratio, high accuracy, high bandwidth, low cost and steady operation and other merits.
Description
Technical field
The present invention relates to low current signal measuring technique, especially a kind of self-correcting testing circuit of utmost point faint optical signal.
Background technology
The research of fluorescence optical fiber temperature sensor technology existing three more than ten years history. Fluorescence signal itself is very faint, and its twilight sunset of fluorescent material used will disappear in 2ms left and right, measure glimmering light intensity in attenuation process, need to have the detection technique of utmost point faint optical signal. Traditional method can be strengthened optical signal to carry out opto-electronic conversion again by device such as photoelectric multiplier, and photomultiplier has very high sensitivity, and key issue is that it needs high-voltage DC power supply, and this causes volume large, and cost is also high. So, more usually semiconductor light sensing device, as phototriode, photodiode, they can be converted to the signal of telecommunication by optical signal, then process with circuit. Phototriode response speed is slower, and multiplication factor is relevant with the size of photoelectric current, and particularly under the low light level irradiates, multiplication factor declines more severely, causes non-linearly, is not suitable for optical radiation measurement. The photoelectric current of photodiode and light irradiation have good linear relationship, and the response time is short, and stable performance is applicable to the luminous intensity of precise measuring radiation. But, photodiode sensitivity is very low, differ from 1～2 order of magnitude with phototriode ratio, therefore, adopt photodiode to detect utmost point faint optical signal and just produce many technical problems: it needs high performance operational amplifier, and gain that will be very high, the operational amplifier of normal light-electricity conversion will be with even begohm feedback resistance of megaohm. The thing followed is, amplifier input resistance is very large, causes arithmetic eror, also has, and noise has been exaggerated, and is filtering noise, and circuit frequency band narrows, and produces the form change of larger hysteresis, decay of afterglow, causes measure error; In addition, also easy job insecurity of the amplifier of high-gain.
Summary of the invention
In view of this, the object of this invention is to provide a kind of self-correcting testing circuit of utmost point faint optical signal.
The present invention adopts following scheme to realize: a kind of self-correcting testing circuit of utmost point faint optical signal, it is characterized in that: comprise a controllable light source, one optical fiber, one photoelectric conversion unit, one amplifying unit and a central processing unit, described in described central processing unit control, after one scheduled time of controllable light source fluorescence excitation, close described controllable light source, described central processing unit receives the signal in described amplifying unit and itself and a preset value is compared to judge that whether described amplifying unit is in amplifier linear work district, if do not rejudge in amplifier linear work district changes the duty of described amplifying unit by described central processing unit after, if carry out sampled measurements fluorescence signal in amplifier linear work district.
In an embodiment of the present invention, described controllable light source is the LED light emitting diode with controlled drive circuit.
In an embodiment of the present invention, described photoelectric conversion unit comprises a PIN photodiode.
In an embodiment of the present invention, described amplifying unit is low input offset current operational amplifier.
In an embodiment of the present invention, described central processing unit is a single-chip microcomputer.
The present invention can realize the accurate measurement of utmost point faint optical signal, and has high s/n ratio, high accuracy, high bandwidth, low cost and steady operation and other merits.
Brief description of the drawings
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is control flow chart of the present invention.
Detailed description of the invention
For making object of the present invention, technical scheme and advantage clearer, below will, by specific embodiment and relevant drawings, the present invention be described in further detail.
As shown in Figure 1, the invention provides a kind of self-correcting testing circuit of utmost point faint optical signal, it is characterized in that: comprise a controllable light source, an optical fiber, a photoelectric conversion unit, an amplifying unit and a central processing unit, controllable light source and amplifying unit described in described central processing unit control, described controllable light source connects described optical fiber, described photoelectric conversion unit receives the light that described optical fiber sends, described photoelectric conversion unit connects described amplifying unit, and described amplifying unit connects described central processing unit; Preferably, described controllable light source is the LED light emitting diode with controlled drive circuit; Described photoelectric conversion unit comprises a PIN photodiode; Described amplifying unit is low input offset current operational amplifier; Described central processing unit is a single-chip microcomputer.
As shown in Figure 2, controllable light source as described in closing after one scheduled time of controllable light source fluorescence excitation (as 2s) described in described central processing unit control, described central processing unit receive signal potential in described amplifying unit and itself and a preset value (as amplifier linear work function or a curve) are compared to judge as described in amplifying unit whether in amplifier linear work district, if do not rejudge in amplifier linear work district changes the duty of described amplifying unit by described central processing unit after, if carry out sampled measurements fluorescence signal in amplifier linear work district.
The present invention uses feedback of status technology, and automatic calibration circuit duty is optimized running environment, realizes fluorescence lifetime high-acruracy survey. Core scheme is: use the good photodiode of the linearity, and be designed to work under low reverse bias; Circuit uses single power supply to simplify circuit; It is only the operational amplifier of 10fA that V/I converter is selected maximum input bias current, and feedback resistance and filter network time constant are as far as possible little, and voltage amplifier ensures the required gain of measuring circuit; Use feedback of status technology, by single-chip microcomputer automatic calibration circuit, Optimization Work state.
The light intensity of controllable light source can be by software control, it produces specific optical signal, through optical fiber excitation fluorescent material, the faint light sending, photoelectric conversion unit receives with a photodiode, the weak current producing converts voltage signal to by high performance operational amplifier, delivers to single-chip microcomputer through amplifying, and software obtains measured temperature after processing. It is only the high performance Rail-to-rail operational amplifier of 10fA that circuit uses maximum bias electric current; Electro-optic detector adopts low gain design, the filter network of low time constant. Detect current signal with single-chip microcomputer, use the work of feedback technique control amplifier, optimize running status.
Above-listed preferred embodiment; the object, technical solutions and advantages of the present invention are further described; institute is understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. the self-correcting testing circuit of a utmost point faint optical signal, comprise a controllable light source, one optical fiber, one photoelectric conversion unit, one amplifying unit and a central processing unit, it is characterized in that: described in described central processing unit control, after one scheduled time of controllable light source fluorescence excitation, close described controllable light source, described central processing unit receives signal in described amplifying unit and itself and a default amplifier linear work function or default curve is compared to judge that whether described amplifying unit is in amplifier linear work district, if do not rejudge in amplifier linear work district changes the duty of described amplifying unit by described central processing unit after, if carry out sampled measurements fluorescence signal in amplifier linear work district.
2. the self-correcting testing circuit of a kind of utmost point faint optical signal according to claim 1, is characterized in that: described controllable light source is the LED light emitting diode with controlled drive circuit.
3. the self-correcting testing circuit of a kind of utmost point faint optical signal according to claim 1, is characterized in that: described photoelectric conversion unit comprises a PIN photodiode.
4. the self-correcting testing circuit of a kind of utmost point faint optical signal according to claim 1, is characterized in that: described amplifying unit is low input offset current operational amplifier.
5. the self-correcting testing circuit of a kind of utmost point faint optical signal according to claim 1, is characterized in that: described central processing unit is a single-chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310412597.6A CN103438996B (en) | 2013-05-28 | 2013-09-12 | A kind of self-correcting testing circuit of utmost point faint optical signal |
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| CN201310258149 | 2013-05-28 | ||
| CN201310258149.5 | 2013-05-28 | ||
| CN2013102581495 | 2013-05-28 | ||
| CN201310412597.6A CN103438996B (en) | 2013-05-28 | 2013-09-12 | A kind of self-correcting testing circuit of utmost point faint optical signal |
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| CN103438996A CN103438996A (en) | 2013-12-11 |
| CN103438996B true CN103438996B (en) | 2016-05-11 |
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| CN105203745B (en) * | 2015-10-16 | 2017-03-22 | 福州大学 | Analog front end detection circuit and detection method for immune strip reading instrument |
| CN111865296B (en) * | 2020-07-28 | 2023-09-26 | 哈尔滨工业大学 | Ultra-high voltage photoelectric coupler and digital signal system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818639A (en) * | 2012-08-03 | 2012-12-12 | 中国科学院上海技术物理研究所 | Weak signal reading-out analog signal link structure for short wave infrared detector |
| CN203011527U (en) * | 2012-12-06 | 2013-06-19 | 常州第二电子仪器有限公司 | Light radiation survey meter receiver tube |
| CN103185869A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Device and method of monitoring scrapping of light emitting diode (LED) light source on line |
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| JP4829848B2 (en) * | 2007-07-26 | 2011-12-07 | オンセミコンダクター・トレーディング・リミテッド | Receiver device, field strength meter characteristic correction method, program |
| JP5451485B2 (en) * | 2010-03-29 | 2014-03-26 | テルモ株式会社 | Optical coherence tomography apparatus and method for operating the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103185869A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Device and method of monitoring scrapping of light emitting diode (LED) light source on line |
| CN102818639A (en) * | 2012-08-03 | 2012-12-12 | 中国科学院上海技术物理研究所 | Weak signal reading-out analog signal link structure for short wave infrared detector |
| CN203011527U (en) * | 2012-12-06 | 2013-06-19 | 常州第二电子仪器有限公司 | Light radiation survey meter receiver tube |
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