CN103472423B - Designated parameter positive exponent pulsed optical signals generation device and method - Google Patents
Designated parameter positive exponent pulsed optical signals generation device and method Download PDFInfo
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Abstract
The generation device of designated parameter positive exponent pulsed optical signals and method, comprise positive exponent signal generator module, electrooptic conversion module, output optical signal monitoring modular and power module, positive exponent electric signal is produced by resistive transmission cable network method, and adopt the mode of pulse current prebias and the summation of positive exponent current signal, P-I Linearity is driven to be less than 1%, the lumination of light emitting diode that the range of linearity is greater than 100 times, realize the linear transformation between electric signal and light signal, finally solve the problem that positive exponent pulsed optical signals produces difficulty, and according to system drive principle, give a kind of feasible method of on-line monitoring output optical signal feature.The present invention can produce positive exponent PARAMETER ALPHA and be greater than 20 μ s
-1, the index characteristic hold in range positive exponent pulsed optical signals that is greater than 100 times, and possess the ability that output optical signal is monitored at line features, can be the research work such as the Laboratory Calibration of the photoeletric measuring system of exponential signal measurement object, debugging, calibration and examination and analog optical signal source is provided.
Description
Technical field
The present invention relates to a kind of Laboratory Calibration and debugging light source of the photoeletric measuring system for index signal measurement object, in particular to a kind of positive exponent pulsed optical signals that can produce designated parameter, and the method for real time on-line monitoring output optical pulse signal characteristic.Specifically, the method can produce strength time spectrum meet positive exponent elevational relationship pulsed optical signals and the index characteristic of output optical signal is evaluated.
Background technology
In nuclear reactor or large-scale nuclear reaction device operational diagnostics process, need running status or the design performance of being diagnosed nuclear device by ranging pulse neutron or gamma time intensity spectrum, this kind of time intensity spectrum has exponential increase rule usually, i.e. pulse strength Ф and time t (μ s) index of coincidence elevational relationship, its typical mathematical model is Φ=K*exp (α * t), and in formula, K is scale factor; α > 0, is called as positive exponent characteristic parameter, μ s
-1.When implementing this kind of measurement, first-selected detector has the scintillation detector that sensitivity adjustable range is large, structural design is compact, be easy to the advantages such as shielding.For scintillation detector, as long as the particle (photon) that the unit interval enters scintillator counts the maximum dose rate linear response upper limit being less than this scintillator, the performance of the photoelectric device that the reliability of this detector output data just uses primarily of detector determined, namely the performance index of photoelectric device are one of key factors determining scintillation detector performance.Therefore, according to different measurement target, before formation scintillation detector, need to debug the performance parameter of photoelectric device in laboratory and examine.The corresponding photoelectric device being used for index signal measurement object, needs a kind of light-source system can simulating positive exponent pulse signal feature, makes analog light source with this, complete the debugging to photoelectric device, calibration, examination and comparison.
Can the common light sources of transponder pulse light signal primarily of following three classes: a class is the relatively-stationary light source of light signal shape.The shape of this kind of light source output optical signal is determined by light source physical mechanism, is generally the bell or similar trigonometric form pulse of class, can not produces positive exponent pulsed optical signals, such as pulse xenon lamp.Equations of The Second Kind is external modulation light source, and this kind of light source is modulated input beam by electrooptical effect, magneto-optic effect and acoustooptic effect, and then provides the output optical signal with modulation signal change.The adjustment curve of this kind of light source shows as non-linear, cannot produce the pulsed optical signals of index of coincidence feature.3rd class is the internal modulation light source of based semiconductor luminescent device, and this kind of light source is mainly used in optical communication field, and modulation signal is just being generally (remaining) string signal, directly can not produce the pulsed optical signals of index of coincidence feature.
Simultaneously, the modulator approach of internal modulation light source is generally and superposes continuous print modulation signal on direct current biasing, this modulation system has two major defects to generation positive exponent pulsed optical signals, first: direct current biasing causes light emitting semiconductor device Chang Liang, and then cause low-light-level measurement photo multiplier device to be measured to produce cathode fatigue effect, and cisco unity malfunction, being unfavorable for producing can the actual positive exponent pulsed optical signals used; Secondly, the use of direct current biasing also can the dynamic range of restriction system greatly.In addition, conventional voltage driven and triode cascode electric current drive all to be existed larger non-linear, cannot realize the linear transformation between positive exponent electric signal and light signal.
Summary of the invention
The present invention is according to the feature of positive exponent pulsed optical signals, design gives a set of complete method comprising electric signal generation, electro-optical signal conversion and output optical signal feature and monitor, specifically comprise positive exponent signal generator module U1, electro-optical signal conversion module U2, output optical signal monitoring modular U3 and power module U4 tetra-parts, as shown in Figure 1.
Technical solution of the present invention is:
A kind of designated parameter positive exponent pulsed optical signals generation device, its special character is: comprise positive exponent signal generator module U1, electrooptic conversion module U2, output optical signal monitoring modular U3 and power module U4; Described positive exponent signal generator module U1 comprises fast rise time square-wave generator, power divider and resistive transmission cable network, described fast rise time square-wave generator is for generation of fast rise time square wave, described power divider is used for fast rise time square wave to be divided into two-way, and described resistive transmission cable network is used for positive exponent voltage pulse signal first via fast rise time square wave being converted to designated parameter; Described electrooptic conversion module U2 comprises pulse current biasing circuit, voltage-current converter circuit and semiconductor light emitting diode device; Wherein, described pulse current biasing circuit is for providing the minimum bias current needed for semiconductor light emitting diode device linear work; Described voltage-current converter circuit is used for positive exponent voltage pulse signal to be converted to positive exponent current pulse signal; Described light emitting semiconductor device is for realizing the linear transformation between positive exponent current pulse signal and light signal; Described output optical signal monitoring modular U3 comprises fast signal recording system and positive exponent signal characteristic parametric analysis system; Described fast signal recording system is oscillograph or the signal acquisition module with fast signal writing function, introduces positive exponent current pulse signal, for the current signal index characteristic of real time record semiconductor light-emitting-diode with tandem; Described positive exponent signal characteristic parametric analysis system combines the current signal index characteristic and light emitting semiconductor device modulating performance measured data of experiment that gather, the signal characteristic of comprehensive evaluation output optical signal; Described power module U4 powers to electrooptic conversion module U2.
Above-mentioned fast rise time square-wave generator is the signal source that rising edge ascending time is less than 5ns, the duration is greater than 2 μ s; Above-mentioned resistive transmission spider lines comprises the resistive transmission line unit of 8 groups of series connection, described resistive transmission line unit comprises resistance in parallel and transmission cable, in each resistive transmission line unit, resistance value is respectively: 1.6 Ω, 3.3 Ω, 6.9 Ω, 15.2 Ω, 37 Ω, 116 Ω, 636 Ω, 13.4k Ω, in each resistive transmission line unit, transmission cable electrical length is determined according to the value of designated parameter α, be specially: 3/64 α, 3/32 α, 3/16 α, 3/8 α, 3/4 α, 3/2 α, 3/ α, 6/ α, wherein the unit of α is μ s
-1.
All adopt band to be wider than 50MHz transmission cable between above-mentioned positive exponent signal generator module U1, electrooptic conversion module U2, output optical signal monitoring modular U3 to connect.
Based on the designated parameter positive exponent pulsed optical signals production method of said apparatus, comprise the following steps:
1] the fast rise time square-wave signal that rising edge ascending time is less than 5ns, the duration is greater than 2 μ s is produced;
2] use power divider that square-wave signal is divided into two-way, after first via signal delay 1 μ s, input resistance transmission circuit network, accesses OPA861 voltage-current converter circuit afterwards again; Second road is directly inputted into another road OPA861 and forms pulsed bias circuit;
3] first via signal is in parallel with the second road signal inputs light emitting semiconductor device;
4] input current signal of light emitting semiconductor device is accessed fast signal recording system by the mode of serial connection after driving light emitting semiconductor device, the drive current feature of Real-Time Monitoring light emitting semiconductor device, wave recording exports positive exponent signal characteristic parametric analysis system to, in conjunction with light emitting semiconductor device performance measurement data, comprehensive evaluation provides the characteristic parameter exporting positive exponent pulsed optical signals.
Above-mentioned electro-optic conversion adopts the mode of pulse current prebias and the summation of positive exponent current signal to drive lumination of light emitting diode; Described pulse current prebias and positive exponent current signal summation be that positive exponent current signal is suitably postponed, make the reference position of positive exponent signal greatly be later than the rising edge of square-wave pulse bias current, and in parallel with pulsed bias current signal after export again.
The advantage that the present invention has:
Common light-pulse generator all can not export designated parameter positive exponent pulsed optical signals, the present invention adopts resistive transmission cable network method to produce positive exponent signal, and adopt the mode of pulse current prebias and the summation of positive exponent current signal, drive the P-I linearity to be less than 1%, the range of linearity be greater than 100 times lumination of light emitting diode, realize the linear transformation between electric signal and light signal, and according to system drive principle, give a kind of feasible method of on-line monitoring output optical signal feature.This invention can produce positive exponent PARAMETER ALPHA and be greater than 20 μ s
-1, the positive exponent pulsed optical signals that index characteristic hold in range is greater than 100 times, can be applied to the laboratory debugging of the photoelectric device in exponential signal measuring system and demarcate.
The resistive transmission cable network method structure that the present invention adopts is simple, convenient and easy, and antijamming capability is strong, and long-time stability are good.
The present invention adopts tandem to monitor the current excitation signal of light emitting semiconductor device, and in conjunction with light emitting semiconductor device performance measurement data, can export the characteristic parameter of positive exponent pulsed optical signals by on-line evaluation.
The present invention adopts modular design, separate between each module, is connected during use by high bandwidth concentric cable, is convenient to adjustment, is applicable to overall in various experimental situation or the preposition use of part.
Accompanying drawing explanation
Fig. 1 is that positive exponent pulsed optical signals produces schematic diagram;
Fig. 2 is resistive transmission spider lines schematic diagram;
Fig. 3 is that resistive transmission spider lines produces positive exponent pulse signal schematic diagram.
Fig. 4 is the index characteristic of the output optical pulse that system produces.
Embodiment
The each module of apparatus of the present invention is as follows:
1) positive exponent signal generator module U1
The present invention adopts network synthesis to produce positive exponent pulse signal, concrete grammar is: resistive transmission spider lines step signal (fast rise time square wave) being inputed to a special ratios, as shown in Figure 2, square-wave signal is divided into 256 little steps by resistive transmission spider lines, and the delay of appropriate time is carried out through transmission line, other end superposition at resistance and transmission circuit network is formed positive exponent signal by the step after delay, as shown in Figure 3.In figure, each cell resistance value is respectively: 1.6 Ω, 3.3 Ω, 6.9 Ω, 15.2 Ω, 37 Ω, 116 Ω, 636 Ω, 13.4k Ω, cable transmission line length is determined according to the value of designated parameter α, be specially: 3/64 α, 3/32 α, 3/16 α, 3/8 α, 3/4 α, 3/2 α, 3/ α, 6/ α, the length changing each unit transmission cable in proportion just can produce the positive exponent pulse electrical signal of different designated parameter.
2) electro-optical signal conversion module U2
The present invention adopts the mode of pulse current prebias and the summation of positive exponent current signal, drives the good lumination of light emitting diode of modulating performance, realizes the linear transformation between electric signal and light signal.Specifically comprise potential pulse current biasing circuit, current converter circuit and semiconductor light emitting diode device.Described pulse current biasing circuit acceptance width is less than the square-wave signal of 100us and is converted to current signal, and model is OPA615.Described voltage-current converter circuit adopts transconductance type chip, and model is OPA861, the positive exponent voltage signal that this circuit input positive exponent signal generator module produces, and realizes the linear transformation function between positive exponent voltage signal and current signal.Positive exponent current signal is suitably postponed, the reference position of positive exponent signal is made greatly to be later than the rising edge of square-wave pulse bias current, and in parallelly with pulsed bias current signal inputting described semiconductor light emitting diode device, model is Mitel1A477, realizes the linear transformation of electric current to light signal.
3) output optical signal monitoring modular U3
The present invention adopts the drive current feature of Real-Time Monitoring light emitting semiconductor device, and in conjunction with light emitting semiconductor device performance measurement data, comprehensive evaluation exports the characteristic parameter of positive exponent pulsed optical signals, specifically comprises fast signal recording system and positive exponent signal characteristic parametric analysis system.Described fast signal recording system mainly refers to oscillograph or has the high-bandwidth signals acquisition module of fast signal writing function, is introduced the current signal driving light emitting semiconductor device, and carry out real time record by serial connection.When load voltage restriction in electro-optical signal conversion module U2 considered by needs, also need shunt before access signal collecting device; Described positive exponent signal characteristic parametric analysis system is for evaluating the signal characteristic of output optical signal, and concrete grammar is calculate the index characteristic providing monitoring current signal in real time, and carries out comprehensive evaluation in conjunction with light emitting semiconductor device modulating performance measured data of experiment.
4) power module
The present invention adopts the linear power supply of standard, does not repeat them here.
The specific embodiment of the invention:
Mercury cut-off is used to produce forward position square-wave signal, and use power divider to be divided into two-way, the first via inputs to length of cable value: the resistive transmission spider lines of 120.5m, 60.3m, 30.1m, 15.1m, 7.5m, 3.8m, 1.9m, 0.9m, accesses OPA861 voltage-current converter circuit more afterwards; Second road is directly inputted into another road OPA861 and forms pulsed bias circuit; Mitel1A477 light emitting diode is inputted by parallel with the second road signal after first via signal delay 1us, the parallel circuit that driving current signal accesses 2 Ω resistance and Tek4104 wide-band oscilloscope in the mode of serial connection is carried out record, and the index characteristic of calculating current waveform, in conjunction with luminescent device performance test test result, the index characteristic of comprehensive evaluation output optical pulse signal, as shown in Figure 4.
Claims (5)
1. a designated parameter positive exponent pulsed optical signals generation device, is characterized in that:
Comprise positive exponent signal generator module (U1), electrooptic conversion module (U2), output optical signal monitoring modular (U3) and power module (U4);
Described positive exponent signal generator module (U1) comprises fast rise time square-wave generator, power divider and resistive transmission cable network, described fast rise time square-wave generator is for generation of fast rise time square wave, described power divider is used for fast rise time square wave to be divided into two-way, and described resistive transmission cable network is used for positive exponent voltage pulse signal first via fast rise time square wave being converted to designated parameter;
Described electrooptic conversion module (U2) comprises pulse current biasing circuit, voltage-current converter circuit and semiconductor light emitting diode device; Second road fast rise time square wave provides the minimum bias current needed for semiconductor light emitting diode device linear work by pulse current biasing circuit; Described voltage-current converter circuit is used for positive exponent voltage pulse signal to be converted to positive exponent current pulse signal; Described light emitting semiconductor device is for realizing the linear transformation between positive exponent current pulse signal and light signal;
Described output optical signal monitoring modular (U3) comprises fast signal recording system and positive exponent signal characteristic parametric analysis system; Described fast signal recording system is oscillograph or the signal acquisition module with fast signal writing function, introduces positive exponent current pulse signal, for the current signal index characteristic of real time record semiconductor light-emitting-diode with tandem; Described positive exponent signal characteristic parametric analysis system combines the current signal index characteristic and light emitting semiconductor device modulating performance measured data of experiment that gather, the signal characteristic of comprehensive evaluation output optical signal;
Described power module (U4) is powered to electrooptic conversion module (U2).
2. designated parameter positive exponent pulsed optical signals generation device according to claim 1, is characterized in that: described fast rise time square-wave generator is the signal source that rising edge ascending time is less than 5ns, the duration is greater than 2 μ s; Described resistive transmission spider lines comprises the resistive transmission line unit of 8 groups of series connection, described resistive transmission line unit comprises resistance in parallel and transmission cable, in each resistive transmission line unit, resistance value is respectively: 1.6 Ω, 3.3 Ω, 6.9 Ω, 15.2 Ω, 37 Ω, 116 Ω, 636 Ω, 13.4k Ω, in each resistive transmission line unit, transmission cable electrical length is determined according to the value of designated parameter α, be specially: 3/64 α, 3/32 α, 3/16 α, 3/8 α, 3/4 α, 3/2 α, 3/ α, 6/ α, wherein the unit of α is μ s
-1.
3. designated parameter positive exponent pulsed optical signals generation device according to claim 1 and 2, is characterized in that: all adopt band to be wider than 50MHz transmission cable between described positive exponent signal generator module (U1), electrooptic conversion module (U2), output optical signal monitoring modular (U3) and connect.
4. based on claims 1 to 3 arbitrary claim described in the designated parameter positive exponent pulsed optical signals production method of device, it is characterized in that: comprise the following steps:
1] the fast rise time square-wave signal that rising edge ascending time is less than 5ns, the duration is greater than 2 μ s is produced;
2] use power divider that square-wave signal is divided into two-way, after first via signal delay 1 μ s, input resistance transmission circuit network, accesses OPA861 voltage-current converter circuit afterwards again; Second road is directly inputted into another road OPA861 and forms pulsed bias circuit;
3] first via signal is in parallel with the second road signal inputs light emitting semiconductor device;
4] input current signal of light emitting semiconductor device is accessed fast signal recording system by the mode of serial connection after driving light emitting semiconductor device, the drive current feature of Real-Time Monitoring light emitting semiconductor device, wave recording exports positive exponent signal characteristic parametric analysis system to, in conjunction with light emitting semiconductor device performance measurement data, comprehensive evaluation provides the characteristic parameter exporting positive exponent pulsed optical signals.
5. designated parameter positive exponent pulsed optical signals production method according to claim 4, is characterized in that: described electro-optic conversion adopts the mode of pulse current prebias and the summation of positive exponent current signal to drive lumination of light emitting diode;
Described pulse current prebias and positive exponent current signal summation be that positive exponent current signal is suitably postponed, make the reference position of positive exponent signal be later than the rising edge of square-wave pulse bias current, and in parallel with pulsed bias current signal after export again.
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| JP2000155052A (en) * | 1998-09-14 | 2000-06-06 | Agency Of Ind Science & Technol | Optical pulse input type high-speed josephson sampling measurement circuit |
| CN101605413A (en) * | 2009-07-06 | 2009-12-16 | 英飞特电子（杭州）有限公司 | Be applicable to the led drive circuit of controllable silicon light modulation |
| CN101909391A (en) * | 2010-08-10 | 2010-12-08 | 浙江大学 | Phase-controlled dimming LED drive and driving method thereof |
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