CN107272485A - A kind of pulse signal acquisition device and method based on low speed ADC - Google Patents
A kind of pulse signal acquisition device and method based on low speed ADC Download PDFInfo
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- CN107272485A CN107272485A CN201710456886.4A CN201710456886A CN107272485A CN 107272485 A CN107272485 A CN 107272485A CN 201710456886 A CN201710456886 A CN 201710456886A CN 107272485 A CN107272485 A CN 107272485A
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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Abstract
The invention discloses a kind of pulse signal acquisition device based on low speed ADC, it includes：Circuit is widened in one pulse, and its input is used to access pulse signal, and circuit is widened in the pulse to be used to widen the impulse level in pulse signal；One ADC units, analog-to-digital conversion is carried out for the pulse signal after to widening；One signal processing unit, is connected to the output end of ADC units, and the signal processing unit is used for the data signal for receiving the output of ADC units.The present invention realizes the low speed ADC samplings of pulse signal, and then saves circuit cost, reduce garbage signal, be easy to data post to handle.
Description
Technical field
Adopted the present invention relates to the signal pickup assembly of flicker xenon lamp, more particularly to a kind of pulse signal based on low speed ADC
Acquisition means.
Background technology
Flicker xenon lamp is pulse type light source, and its instantaneous luminous power will be significantly larger than common continuous luminous xenon lamp, using such
Light source can substantially reduce requirement to light source power in the case where ensureing signal to noise ratio, and can by light source lighting hours with
The signal acquisition time synchronizes, and reduces influence of the bleaching effect to measurement result.In actual applications, putting for xenon lamp is flashed
The electric time can be ns grades, and discharge frequency is 1KHz, generally carry out continuous acquisition, this collection dress using high-speed ADC or capture card
Put and not only result in the rising of equipment R＆D costs, and due to the sparse burst pulse characteristic of xenon lamp signal, in the data gathered
A large amount of hashes can be included, larger difficulty is brought to follow-up data handling procedure.
The content of the invention
The technical problem to be solved in the present invention is, is used to realize that pulse is believed in view of the shortcomings of the prior art there is provided one kind
Number low speed ADC sampling, and then save circuit cost, reduce garbage signal, be easy to data post handle signal pickup assembly.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that.
A kind of pulse signal acquisition device based on low speed ADC, it includes：Circuit is widened in one pulse, and its input is used
In access pulse signal, circuit is widened in the pulse to be used to widen the impulse level in pulse signal；One ADC units, are used for
Pulse signal after to widening carries out analog-to-digital conversion；One signal processing unit, is connected to the output end of ADC units, the signal
Processing unit is used for the data signal for receiving the output of ADC units.
Preferably, the pulse widens circuit and includes first resistor, second resistance, diode and electric capacity, described first
The front end of resistance and the front end of second resistance are widened after being connected with each other as pulse after the input of circuit, the first resistor
End is connected to the anode of diode, and the front end of the negative electrode of the diode, the rear end of second resistance and electric capacity is made after being connected with each other
The output end of circuit is widened for pulse, the rear end ground connection of the electric capacity, the resistance of the first resistor is less than the resistance of second resistance
Value.
Preferably, also include and be serially connected with pulse and widen sampling hold circuit between circuit and ADC units, the sampling
Holding circuit be used for circuit output is widened into pulse pulse signal level value is held in pulse duration range, transmit afterwards to
ADC units.
Preferably, the sampling hold circuit includes model AD684 sampling holder.
Preferably, the ADC units are the analog-digital converters that sample frequency is 1KHz.
Preferably, the signal processing unit includes single-chip microcomputer and its peripheral circuit.
A kind of pulse signal acquisition method based on low speed ADC, this method realizes that described device includes based on a device
Circuit, an ADC units and a signal processing unit are widened in one pulse, and methods described includes：Step S1, is that circuit is widened in pulse
Input accesses pulse signal；
Step S2, the pulse widens circuit and widens the impulse level in pulse signal；
Step S3, the ADC units to widening after pulse signal carry out analog-to-digital conversion；
Step S4, the ADC units are by the digital data transmission after analog-to-digital conversion to signal processing unit.
Preferably, the pulse widens circuit and includes first resistor, second resistance, diode and electric capacity, described first
The front end of resistance and the front end of second resistance are widened after being connected with each other as pulse after the input of circuit, the first resistor
End is connected to the anode of diode, and the front end of the negative electrode of the diode, the rear end of second resistance and electric capacity is made after being connected with each other
The output end of circuit is widened for pulse, the rear end ground connection of the electric capacity, the resistance of the first resistor is less than the resistance of second resistance
Value；In the step S2, when the input that circuit is widened in the pulse accesses impulse level, the diode current flow is to make electricity
Capacity charge, while the output end that circuit is widened in pulse produces impulse level, when the pulse electricity of circuit input end is widened in the pulse
During flat disappearance, the diode cut-off, the electric capacity is discharged by second resistance, and the pulse of circuit output end is widened in the pulse
Level duration extends with the discharge process of electric capacity.
Preferably, the pulse is widened and sampling hold circuit is serially connected between circuit and ADC units, performs the step S3
Before, the pulse signal for pulse first being widened into circuit output using the sampling hold circuit is held in level in pulse duration range
Value, is transmitted to ADC units afterwards.
Preferably, the sampling hold circuit includes model AD684 sampling holder, and the ADC units are to adopt
Sample frequency is 1KHz analog-digital converter, and the signal processing unit includes single-chip microcomputer and its peripheral circuit.
In pulse signal acquisition device disclosed by the invention based on low speed ADC, its course of work, when circuit is widened in pulse
Input access pulse signal when, widen circuit by the pulse and widen the impulse level in pulse signal, recycle ADC
Unit to widening after pulse signal carry out analog-to-digital conversion, afterwards by digital data transmission to signal processing unit, the present invention profit
Widened with pulse after circuit widens to narrow pulse signal, extend the duration of impulse level, based on the characteristic, only
It is the collection and conversion that pulse signals can be achieved using low speed ADC so that ADC units can select low speed ADC converters, nothing
The higher high-speed ADC of call for bids lattice, meanwhile, the impulse level after widening will cover some useless spikings, compared to existing
For the circuit that high-speed ADC is used in technology, present invention substantially reduces garbage signal, improve in later stage signal processing
Accuracy and reliability.
Brief description of the drawings
Fig. 1 is the circuit diagram of pulse signal acquisition device of the present invention.
Fig. 2 is the signal waveforms that circuit input side and outlet side are widened in pulse.
Fig. 3 is the signal waveforms of sampling hold circuit input side and outlet side.
Fig. 4 is the signal timing diagram at each node in pulse signal acquisition device of the present invention.
Embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples.
The invention discloses a kind of pulse signal acquisition device based on low speed ADC, as shown in figure 1, it includes an arteries and veins
Circuit 1, an ADC units 2 and a signal processing unit 3 are widened in punching, wherein：
The input that circuit 1 is widened in the pulse is used to access pulse signal, and circuit 1 is widened in the pulse to be used for pulse
Impulse level in signal is widened；
Pulse signal after the ADC units 2 are used for widening carries out analog-to-digital conversion；
The signal processing unit 3 is connected to the output end of ADC units 2, and the signal processing unit 3 is used to receive ADC
The data signal that unit 2 is exported.
Said apparatus in the course of the work, when pulse widen circuit 1 input access pulse signal when, by the pulse
Widen circuit 1 to widen the impulse level in pulse signal, the pulse signal after 2 pairs of recycling ADC units are widened carries out modulus
Conversion, afterwards by digital data transmission to signal processing unit 3, the present invention widens circuit 1 using pulse and narrow pulse signal is entered
After row is widened, the duration of impulse level is extended, is that can be achieved to believe pulse merely with low speed ADC based on the characteristic
Number collection and conversion so that ADC units 2 can select low speed ADC converters, the high-speed ADC higher without price, meanwhile,
Impulse level after widening will cover some useless spikings, compared with prior art the circuit of middle use high-speed ADC and
Speech, present invention substantially reduces garbage signal, improves the accuracy and reliability in later stage signal processing.
Pulse signal acquisition device of the present invention can be used for the ns levels that collection flicker xenon lamp or other short-pulse light sources are sent
Pulse signal, with larger dynamic range and higher acquisition precision, the pulse signal acquisition device and flicker xenon lamp height
Coordinate, in gatherer process, flicker xenon lamp exposure is synchronous with signal acquisition to be carried out.Based on low speed ADC Acquisition Circuit, by by xenon
After lamp narrow pulse signal is widened, peak signal is acquired, Acquisition Circuit is enormously simplify, research and development are effectively reduced
Cost, reduces the complexity of signal transacting, has on for flicker xenon lamp or the collection of similar light sources narrow pulse signal bigger
Superiority.
In the present embodiment, the pulse widens circuit 1 and includes first resistor R1, second resistance R2, diode D and electric capacity
The input of circuit 1 is widened in C, the first resistor R1 front end and second resistance R2 front end as pulse after being connected with each other,
The rear end of the first resistor R1 is connected to diode D anode, the negative electrode of the diode D, second resistance R2 rear end and
The output end of circuit 1, the rear end ground connection of the electric capacity C, first electricity are widened after being connected with each other as pulse in electric capacity C front end
The resistance for hindering R1 is less than second resistance R2 resistance.
The operation principle that circuit 1 is widened in above-mentioned pulse is：Second resistance R2 and electric capacity C constitutes RC circuits, when the pulse
When widening the input access impulse level of circuit 1, the diode D, which is turned on, causes electric capacity C chargings, while the pulse is widened
The output end of circuit 1 produces impulse level therewith, described when the impulse level that the input of circuit 1 is widened in the pulse disappears
Diode D ends, and the electric capacity C is discharged by second resistance R2, and the impulse level that the output end of circuit 1 is widened in the pulse continues
Time extends with electric capacity C discharge process, until the impulse level that the input of circuit 1 is widened in pulse arrives again.
Fig. 2 is refer to, solid line is the waveform before impulse level is widened, and dotted line is the waveform after impulse level is widened, actual
In, resistance of the resistance much smaller than second resistance R2 of the first resistor R1, the electric discharge duration to extend electric capacity C, this
Outside, by setting first resistor R1 and second resistance R2 resistance, electric capacity C electric discharge duration can suitably be adjusted.
As a kind of preferred embodiment, the present embodiment, which also includes, to be serially connected with pulse and widens between circuit 1 and ADC units 2
Sampling hold circuit 4, the sampling hold circuit 4 is used to pulse widening pulse signal that circuit 1 exports in pulse duration range
Level value is held in, is transmitted afterwards to ADC units 2.Further, the sampling hold circuit 4 includes model AD684's
Sampling holder.Sampling hold circuit 4 in the present embodiment is the circuit built based on SHA chips AD684, refer to Fig. 3, empty
Line is the waveform after impulse level is widened, and solid line is the waveform after the stabilization of sampling hold circuit 4, holding, according to front and rear ripple
Shape can be seen that sampling hold circuit 4 and can be maintained at the pulse signal after widening near peak value in its pulse duration range, from
And reduce ADC collection difficulty.
In the present embodiment, the ADC units 2 are the analog-digital converters that sample frequency is 1KHz.Wherein, ADC units 2 are adopted
Sample frequency is 1KHz, belongs to low speed ADC, and it is close with the frequency of exposure for flashing xenon lamp 1KHz, can be stablized, efficiently to sampling
The signal that holding circuit 4 is exported carries out analog-to-digital conversion.
On signal processing, the signal processing unit 3 includes single-chip microcomputer and its peripheral circuit.The signal transacting
During unit 3 is control using single-chip microcomputer as core, processing unit, practical application, the signal processing unit 3 can be used for regulation and control and dodge
The result of bright xenon lamp excitation signal, sampling hold circuit collection signal and compensation ADC collections.
In order to preferably describe technical scheme, invention additionally discloses a kind of pulse signal based on low speed ADC
Acquisition method, this method realizes that described device includes a pulse and widens circuit 1, an ADC units 2 and a letter based on a device
Number processing unit 3, methods described includes：
Step S1, is the input access pulse signal that circuit 1 is widened in pulse；
Step S2, the pulse widens circuit 1 and widens the impulse level in pulse signal；
Step S3, the pulse signal after 2 pairs of the ADC units are widened carries out analog-to-digital conversion；
Step S4, the ADC units 2 are by the digital data transmission after analog-to-digital conversion to signal processing unit 3.
Process is widened on impulse level, the pulse widens circuit 1 and includes first resistor R1, second resistance R2, two
After the front end interconnection of pole pipe D and electric capacity C, the first resistor R1 front end and second resistance R2 circuit is widened as pulse
1 input, the rear end of the first resistor R1 is connected to diode D anode, the negative electrode of the diode D, second resistance
The output end of circuit 1 is widened in R2 rear end and electric capacity C front end as pulse after being connected with each other, the rear end of the electric capacity C is grounded,
The resistance of the first resistor R1 is less than second resistance R2 resistance；
In the step S2, when the input that circuit 1 is widened in the pulse accesses impulse level, the diode D is led
Pass to and make electric capacity C charge, while the output end that circuit 1 is widened in pulse produces impulse level, widen circuit 1 when the pulse and input
When the impulse level at end disappears, the diode D cut-offs, the electric capacity C is discharged by second resistance R2, and electricity is widened in the pulse
The impulse level duration of the output end of road 1 extends with electric capacity C discharge process.
In the present embodiment, the pulse is widened and sampling hold circuit 4 is serially connected between circuit 1 and ADC units 2, performs institute
Before stating step S3, pulse is first widened into pulse signal that circuit 1 exports in pulse duration range using the sampling hold circuit 4
Level value is held in, is transmitted afterwards to ADC units 2.
When entering line flicker xenon lamp signal acquisition using the above method, refer to Fig. 4, from signal processing unit to flicker xenon lamp
Xenon lamp excitation signal is exported, flicker xenon lamp is received after xenon lamp excitation signal, xenon lamp exposure is adopted using default detector afterwards
Collect xenon lamp pulse signal, input a signal into and widen circuit to pulse and widen pulse signal, the pulse signal after widening input to
Sampling hold circuit, peak value is maintained using sampling hold circuit by pulse signal, so that low speed ADC is gathered, when ADC units are adopted
After the completion of collection, result is stored to signal processing unit, after signal processing unit compensates the result, obtains flashing xenon lamp
Light intensity value is exposed, the purpose with low speed ADC collection flicker xenon lamp burst pulses is reached.Test process is：It is 1us's to gather pulsewidth
Flicker xenon lamp excites the fluorescence signal of fluorescent samples, changes fluorescent samples concentration, tests collection result under different fluorescence intensities, tests
The linearity for demonstrate,proving present apparatus collection is more than 0.9998.
Pulse signal acquisition device and acquisition method disclosed by the invention based on low speed ADC, can be achieved to flicker xenon lamp
The collection of pulse signal, with higher precision, can not only reduce requirement of the Acquisition Circuit to ADC, additionally it is possible to simplify collection system
System and reduction design cost.
Simply preferred embodiments of the present invention described above, are not intended to limit the invention, all technology models in the present invention
Interior done modification, equivalent substitution or improvement etc. are enclosed, be should be included in the range of of the invention protect.
Claims (10)
1. a kind of pulse signal acquisition device based on low speed ADC, it is characterised in that include：
Circuit (1) is widened in one pulse, and its input is used to access pulse signal, and circuit (1) is widened in the pulse to be used for pulse
Impulse level in signal is widened；
One ADC units (2), analog-to-digital conversion is carried out for the pulse signal after to widening；
One signal processing unit (3), is connected to the output end of ADC units (2), and the signal processing unit (3) is used to receive ADC
The data signal of unit (2) output.
2. the pulse signal acquisition device as claimed in claim 1 based on low speed ADC, it is characterised in that the pulse is widened
Circuit (1) includes first resistor (R1), second resistance (R2), diode (D) and electric capacity (C), the first resistor (R1)
The input of circuit (1), the first resistor are widened in front end and the front end of second resistance (R2) as pulse after being connected with each other
(R1) rear end is connected to diode (D) anode, negative electrode, the rear end of second resistance (R2) and the electric capacity of the diode (D)
(C) output end of circuit (1), the rear end ground connection of the electric capacity (C), described first are widened after being connected with each other as pulse in front end
The resistance of resistance (R1) is less than the resistance of second resistance (R2).
3. the pulse signal acquisition device as claimed in claim 1 based on low speed ADC, it is characterised in that also include concatenation
The sampling hold circuit (4) between circuit (1) and ADC units (2) is widened in pulse, the sampling hold circuit (4) is used for will
The pulse signal that circuit (1) output is widened in pulse is held in level value in pulse duration range, transmits afterwards to ADC units (2).
4. the pulse signal acquisition device as claimed in claim 3 based on low speed ADC, it is characterised in that the sampling is kept
Circuit (4) includes model AD684 sampling holder.
5. the pulse signal acquisition device as claimed in claim 1 based on low speed ADC, it is characterised in that the ADC units
(2) be sample frequency be 1KHz analog-digital converter.
6. the pulse signal acquisition device as claimed in claim 1 based on low speed ADC, it is characterised in that the signal transacting
Unit (3) includes single-chip microcomputer and its peripheral circuit.
7. a kind of pulse signal acquisition method based on low speed ADC, it is characterised in that this method is realized based on a device, described
Device includes a pulse and widens circuit (1), an ADC units (2) and a signal processing unit (3), and methods described includes：
Step S1, is the input access pulse signal that circuit (1) is widened in pulse；
Step S2, the pulse widens circuit (1) and widens the impulse level in pulse signal；
Step S3, the ADC units (2) to widening after pulse signal carry out analog-to-digital conversion；
Step S4, the ADC units (2) are by the digital data transmission after analog-to-digital conversion to signal processing unit (3).
8. the pulse signal acquisition method as claimed in claim 7 based on low speed ADC, it is characterised in that the pulse is widened
Circuit (1) includes first resistor (R1), second resistance (R2), diode (D) and electric capacity (C), the first resistor (R1)
The input of circuit (1), the first resistor are widened in front end and the front end of second resistance (R2) as pulse after being connected with each other
(R1) rear end is connected to diode (D) anode, negative electrode, the rear end of second resistance (R2) and the electric capacity of the diode (D)
(C) output end of circuit (1), the rear end ground connection of the electric capacity (C), described first are widened after being connected with each other as pulse in front end
The resistance of resistance (R1) is less than the resistance of second resistance (R2)；
In the step S2, when the input that circuit (1) is widened in the pulse accesses impulse level, the diode (D) is led
Pass to and make electric capacity (C) charge, while the output end that circuit (1) is widened in pulse produces impulse level, when circuit is widened in the pulse
(1) when the impulse level of input disappears, diode (D) cut-off, the electric capacity (C) is discharged by second resistance (R2),
The impulse level duration that circuit (1) output end is widened in the pulse extends with the discharge process of electric capacity (C).
9. the pulse signal acquisition method as claimed in claim 7 based on low speed ADC, it is characterised in that the pulse is widened
Sampling hold circuit (4) is serially connected between circuit (1) and ADC units (2), performs before the step S3, utilizes the sampling
The pulse signal that pulse is first widened circuit (1) output by holding circuit (4) is held in level value in pulse duration range, transmits afterwards
To ADC units (2).
10. the pulse signal acquisition method as claimed in claim 9 based on low speed ADC, it is characterised in that the sampling is kept
Circuit (4) includes model AD684 sampling holder, and the ADC units (2) are the analog-to-digital conversions that sample frequency is 1KHz
Device, the signal processing unit (3) includes single-chip microcomputer and its peripheral circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710456886.4A CN107272485A (en) | 2017-06-16 | 2017-06-16 | A kind of pulse signal acquisition device and method based on low speed ADC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710456886.4A CN107272485A (en) | 2017-06-16 | 2017-06-16 | A kind of pulse signal acquisition device and method based on low speed ADC |
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| CN201710456886.4A Pending CN107272485A (en) | 2017-06-16 | 2017-06-16 | A kind of pulse signal acquisition device and method based on low speed ADC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112383311A (en) * | 2020-11-19 | 2021-02-19 | 珠海零边界集成电路有限公司 | Successive approximation type analog-digital converter and data conversion method thereof |
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| CN101061549A (en) * | 2002-12-02 | 2007-10-24 | 爱特梅尔股份有限公司 | System and method for expanding a pulse width |
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