CN102847686A - Signal processing circuit based on laser foreign matter sorting system - Google Patents
Signal processing circuit based on laser foreign matter sorting system Download PDFInfo
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- CN102847686A CN102847686A CN2012102694361A CN201210269436A CN102847686A CN 102847686 A CN102847686 A CN 102847686A CN 2012102694361 A CN2012102694361 A CN 2012102694361A CN 201210269436 A CN201210269436 A CN 201210269436A CN 102847686 A CN102847686 A CN 102847686A
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Abstract
本发明公开了一种基于激光异物分拣系统的信号处理电路，包括激光扫描系统、光电倍增管、电流电压转换电路、n级串联的电压放大电路、积分电路、相加器和缓冲电路；所述激光扫描系统把光投射到被扫描的物体上，散射的激光被三个以上光电倍增管接收；所述电流电压转换电路输入端与光电倍增管连接，输出端依序与n级串联的电压放大电路、积分电路串接；多路所述积分电路信号传送给相加器，再把相加器信号输出到缓冲电路，然后把信号输出。本发明具有扫描精度高，宽带、建立时间短、转换速度高、低噪声、超低的增益误差等性能。
The invention discloses a signal processing circuit based on a laser foreign matter sorting system, including a laser scanning system, a photomultiplier tube, a current-voltage conversion circuit, n-stage series voltage amplification circuits, an integrating circuit, an adder and a buffer circuit; The laser scanning system projects light onto the object to be scanned, and the scattered laser light is received by more than three photomultiplier tubes; the input end of the current-voltage conversion circuit is connected to the photomultiplier tube, and the output end is sequentially connected to n-stage voltage The amplifying circuit and the integrating circuit are connected in series; multiple signals of the integrating circuit are transmitted to the adder, and then the signal of the adder is output to the buffer circuit, and then the signal is output. The invention has the properties of high scanning precision, wide band, short settling time, high conversion speed, low noise, ultra-low gain error and the like.
Description
Technical field
The present invention relates to a kind of signal processing circuit based on laser scanning, especially for being applied to the tobacco leaf sorting system, also be applicable to the needs that other detect occasion.
Background technology
General is fluorescent lamp for industrial scanning system light source, and with the CCD camera signal is received, owing to fluorescent lamp stability can not be in along with the prolongation of time a stable level, and will be larger for the prolongation error that detects along with the time.Laser is along with the prolongation of time has very high stability.The dynamic range of CCD is not enough wide, and is good not as photomultiplier (PMT) in accurate detection material.PMT has higher advantage in high accuracy detects.
Summary of the invention
The object of the invention is to address the above problem, provide a kind of scanning accuracy for industrial detection high, broadband, Time Created are short, the scanning system of the high and low noise of conversion speed, ultralow gain error and preamplifier and signal thereof are processed.
The technical solution used in the present invention is: a kind of signal processing circuit based on laser foreign matter sorting system comprises voltage amplifier circuit, integrating circuit, adder and buffer circuit that laser scanning system, photomultiplier, current-to-voltage converting circuit, n level are connected;
Described laser scanning system projects light on the object that is scanned, and the laser of scattering is received by three above photomultipliers;
Described current-to-voltage converting circuit input is connected with photomultiplier, the voltage amplifier circuit that output is sequentially connected with the n level, integrating circuit serial connection;
The described integrating circuit signal of multichannel sends adder to, again the adder signal is outputed to buffer circuit, then signal is exported.
As preferably, the laser instrument of described laser scanning system is the continuous type laser instrument, is the light source of laser scanning system, and spectrum is visible light and infrared ray.
As preferably, the laser instrument of described laser scanning system is more than three, selects red laser, blue laser, infrared laser or green laser.
As preferably, comprise amplifier A1, resistance R, capacitor C, analog switch SW1, analog switch SW2 and comparator C MP in the described integrating circuit;
Wherein amplifier A1, resistance R and capacitor C form integrating circuit, and resistance R is connected between the voltage amplifier circuit and analog switch SW2 of described n level series connection, and capacitor C is connected across between amplifier A1 input pin and the output pin; Comparator C MP exports two paths of signals, single spin-echo, the two-way output signal is used for control simulation interrupteur SW 1 and analog switch SW2, be connected on respectively on the control pin Vctrl of analog switch SW1 and analog switch SW2, the input signal homophase termination one control signal Vin of comparator C MP, be used for controlling the conducting of the dutycycle of output signal and control simulation switch and close, comparator C MP end of oppisite phase ground connection or connect reference voltage; Analog switch SW1 is connected in parallel on the capacitor C, and analog switch SW2 is connected between the anti-phase pin of resistance R and amplifier A1.
The light that photomultiplier of the present invention will receive is converted into the signal of telecommunication, and the receiving spectrum scope is visible light and infrared ray.Current-to-voltage converting circuit is converted into voltage signal with current signal.Integrating circuit carries out integration sampling to voltage signal, finishes the signal characteristic of scanned object within a period of time.Utilize adder that each signal is made up to the multichannel integrated signal, reflect on the whole the signal characteristic of scanned object.
The invention solves fluorescent light source poor stability in industry scanning, receive signal with CCD, narrow dynamic range can not the high accuracy detection material.Laser scanning system is to object point by point scanning, and stability is high, and it is wide to receive dynamic range of signals with photomultiplier, can high-precision inspected object.Because some object is approximate to the scattered light of identical laser, it is very little to receive rear signal of telecommunication difference with photomultiplier, but different objects is just obvious to the differentiation of multiple various lasers, so use the multiple spectrum laser scans, then the signal of different current-to-voltage converting circuits carried out addition, and then distinguish object.
Beneficial effect: circuit system of the present invention converts optical signal to the signal of telecommunication, uses the wideband current voltage conversion circuit, can receive the circuit of high-velocity scanning system.The present invention has the scanning accuracy height, and broadband, Time Created are short, the high and low noise of conversion speed, ultralow performances such as gain error.The present invention is used for the high-rate laser scanning system, and the signal that photomultiplier is received amplifies, and signal is processed, and is used for the analysis to scanned object.
Description of drawings
Fig. 1 is the structured flowchart of circuit of the present invention.
Fig. 2 is the integrating circuit schematic diagram of circuit of the present invention.
The specific embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of signal processing circuit based on laser foreign matter sorting system comprises voltage amplifier circuit 4, integrating circuit 5, adder 6 and buffer circuit 7 that laser scanning system 1, photomultiplier 2, current-to-voltage converting circuit 3, n level are connected;
Described laser scanning system 1 projects light on the object that is scanned, and the laser of scattering is received by three above photomultipliers 2;
Described current-to-voltage converting circuit 3 inputs are connected with photomultiplier 2, the voltage amplifier circuit 4 that output is sequentially connected with the n level, integrating circuit 5 serial connections;
Described integrating circuit 5 signals of multichannel send adder 6 to, again adder 6 signals are outputed to buffer circuit 7, then signal are exported.
The laser instrument of described laser scanning system 1 is the continuous type laser instrument, is the light source of laser scanning system, and spectrum is visible light and infrared ray.The laser instrument of described laser scanning system 1 is more than three, selects red laser, blue laser, infrared laser or green laser.
Mentioned a kind of laser scanning system in the Chinese patent " a kind of laser material sorting device " (publication number 102069077A), this laser scanning system has comprised the laser instrument of different wave length, by the laser beam merging apparatus laser is gathered at a place, by rotating prism laser reflection to scanning object, the light of scattering receives to photomultiplier laser reflection by multifaceted prism and speculum successively to optical signal.
The light of the object reflection of the laser that the laser instrument in the laser scanning system 1 more than three sends through being scanned is received by the laser of 2 pairs of different colours of photomultiplier, and photomultiplier 2 windows have optical filter, and the laser that only particular laser is sent receives.Photomultiplier 2 changes into the signal of telecommunication to optical signal, through current-to-voltage converting circuit 3, the current signal of photomultiplier 2 outputs is converted into voltage signal, the voltage amplifier circuit 4 of n level series connection can continue the voltage signal of current-to-voltage converting circuit 3 outputs to amplify, integrating circuit 5 is used for the voltage signal of front is carried out integration, can be used to check the feature of scanned object within a period of time.Because some object is identical to the spectrum that scatters out of same laser, its signal of telecommunication is also identical, but not all laser instrument is identical to same article scattered signal, so available multiple laser instrument scans object, with different photomultipliers signal is received.So carry out addition with 6 pairs of signals of adder, and then reflect the feature of scanned object.Buffer circuit 7 can be used for isolating subsequent conditioning circuit and front integrating circuit 5, thereby can not interact.
As shown in Figure 2, comprise amplifier A1, resistance R, capacitor C, analog switch SW1, analog switch SW2 and comparator C MP in the described integrating circuit;
Wherein amplifier A1, resistance R and capacitor C form integrating circuit, and resistance R is connected between the voltage amplifier circuit and analog switch SW2 of described n level series connection, and capacitor C is connected across between amplifier A1 input pin 1 and the output pin 3; Comparator C MP exports two paths of signals, single spin-echo, the two-way output signal is used for control simulation interrupteur SW 1 and analog switch SW2, be connected on respectively on the control pin Vctrl of analog switch SW1 and analog switch SW2, the input signal homophase termination one control signal Vin of comparator C MP, be used for controlling the conducting of the dutycycle of output signal and control simulation switch and close, comparator C MP end of oppisite phase ground connection or connect reference voltage; Analog switch SW1 is connected in parallel on the capacitor C, and analog switch SW2 is connected between the anti-phase pin 1 of resistance R and amplifier A1.
Integration amplifier A1 is that an offset voltage and offset current and bias current are little, and open-loop gain and gain bandwidth product are large, the integrated operational amplifier that input resistance is high.After constant τ=RC of the time of integration determines, because the input resistance R of anti-phase integrator
iTherefore=R often wishes that R is larger.Satisfy under the condition that input resistance requires in the value of R, generally select larger C value.Analog switch SW1, SW2 are a kind of enough bandwidth that has, and switch time is little, and Leakage Current is little, the analog switch that conducting resistance is little.Comparator C MP selects offset voltage little, and bias current is little, and time response is fast, the comparator that the output time-delay is little.R
PBe static balancing resistance, be used for compensating the imbalance that bias current produces, generally get R
P=R.
Should be pointed out that for those skilled in the art under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each part all available prior art realized.
Claims (4)
1. the signal processing circuit based on laser foreign matter sorting system is characterized in that: the voltage amplifier circuit, integrating circuit, adder and the buffer circuit that comprise laser scanning system, photomultiplier, current-to-voltage converting circuit, the series connection of n level;
Described laser scanning system projects light on the object that is scanned, and the laser of scattering is received by three above photomultipliers;
Described current-to-voltage converting circuit input is connected with photomultiplier, the voltage amplifier circuit that output is sequentially connected with the n level, integrating circuit serial connection;
The described integrating circuit signal of multichannel sends adder to, again the adder signal is outputed to buffer circuit, then signal is exported.
2. a kind of signal processing circuit based on laser foreign matter sorting system according to claim 1, it is characterized in that: the laser instrument of described laser scanning system is the continuous type laser instrument, is the light source of laser scanning system, spectrum is visible light and infrared ray.
3. a kind of signal processing circuit based on laser foreign matter sorting system according to claim 1, it is characterized in that: the laser instrument of described laser scanning system is more than three, selects red laser, blue laser, infrared laser or green laser.
4. a kind of signal processing circuit based on laser foreign matter sorting system according to claim 1 is characterized in that: comprise amplifier A1, resistance R, capacitor C, analog switch SW1, analog switch SW2 and comparator C MP in the described integrating circuit;
Wherein amplifier A1, resistance R and capacitor C form integrating circuit, and resistance R is connected between the voltage amplifier circuit and analog switch SW2 of described n level series connection, and capacitor C is connected across between amplifier A1 input pin and the output pin; Comparator C MP exports two paths of signals, single spin-echo, the two-way output signal is used for control simulation interrupteur SW 1 and analog switch SW2, be connected on respectively on the control pin Vctrl of analog switch SW1 and analog switch SW2, the input signal homophase termination one control signal Vin of comparator C MP, be used for controlling the conducting of the dutycycle of output signal and control simulation switch and close, comparator C MP end of oppisite phase ground connection or connect reference voltage; Analog switch SW1 is connected in parallel on the capacitor C, and analog switch SW2 is connected between the anti-phase pin of resistance R and amplifier A1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102694361A CN102847686A (en) | 2012-07-31 | 2012-07-31 | Signal processing circuit based on laser foreign matter sorting system |
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| CN2012102694361A CN102847686A (en) | 2012-07-31 | 2012-07-31 | Signal processing circuit based on laser foreign matter sorting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196873A (en) * | 2013-03-06 | 2013-07-10 | 东南大学 | Detection imaging system based on laser scanning |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6304472B1 (en) * | 1999-05-14 | 2001-10-16 | Hitachi, Ltd. | Electric power converting system with integrator providing output indicative of current |
| CN1347538A (en) * | 1999-05-11 | 2002-05-01 | 迪布尔特有限公司 | Double sheet detector for automated transaction machine |
| CN1426177A (en) * | 2001-12-12 | 2003-06-25 | 易河清 | Light receiving pre-amplifier |
| CN1653696A (en) * | 2002-05-09 | 2005-08-10 | 神经网路处理有限公司 | Digital-analog converter |
| CN102069077A (en) * | 2010-10-15 | 2011-05-25 | 合肥美亚光电技术有限责任公司 | Laser material sorting device |
-
2012
- 2012-07-31 CN CN2012102694361A patent/CN102847686A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1347538A (en) * | 1999-05-11 | 2002-05-01 | 迪布尔特有限公司 | Double sheet detector for automated transaction machine |
| US6304472B1 (en) * | 1999-05-14 | 2001-10-16 | Hitachi, Ltd. | Electric power converting system with integrator providing output indicative of current |
| CN1426177A (en) * | 2001-12-12 | 2003-06-25 | 易河清 | Light receiving pre-amplifier |
| CN1653696A (en) * | 2002-05-09 | 2005-08-10 | 神经网路处理有限公司 | Digital-analog converter |
| CN102069077A (en) * | 2010-10-15 | 2011-05-25 | 合肥美亚光电技术有限责任公司 | Laser material sorting device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196873A (en) * | 2013-03-06 | 2013-07-10 | 东南大学 | Detection imaging system based on laser scanning |
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Application publication date: 20130102 |