CN109959623A - A kind of sampling system and its method of sampling of CRDS gas concentration detector - Google Patents
A kind of sampling system and its method of sampling of CRDS gas concentration detector Download PDFInfo
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- 238000005070 sampling Methods 0.000 title claims abstract description 64
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Abstract
The present invention relates to a kind of sampling system and its method of sampling based on CRDS gas concentration detector, the system include state converter, ADC sampler, laser, data buffer and signal processor；State converter is separately connected ADC sampler, laser, interconnects between signal processor and data buffer and ADC sampler and data buffer, interconnects between data buffer and signal processor；The sampling AD value and oneself state that state converter is sent according to threshold value, the ADC sampler determine according to the state starting or closing, the starting or stoping of ADC sampler, the processing of the caching of data and data of laser come transition status.Sampling system and the method for sampling proposed by the present invention can generate to decline well swings signal, acquisition valid data and quick and precisely calculates ring-down time, eliminates special laser cut-out circuit.
Description
Technical field
The invention belongs to gas concentration detection fields, and in particular to a kind of sampling system of CRDS gas concentration detector and
Its method of sampling.
Background technique
Gas detection method is broadly divided into chemical measure and spectrum detection method two major classes.The essence of spectrum detection method is object
The absorption and transmitting of confrontation electromagnetic wave, cavity ring down spectroscopy technology (CRDS technology) is the one kind developed rapidly in recent years
Absorption spectrum detection technique.CRDS technology measures light in the ring-down time swung in chamber that declines, which only swings resonant reflec-tors with declining
Reflectivity is related with the absorption of swinging intracavitary medium of declining, and unrelated with the size of incident intensity, therefore measurement result is not swashed by pulse
The weak influence of light intensity has the advantages that high sensitivity, signal-to-noise ratio height, strong antijamming capability.
CRDS gas concentration detector is the detection device that gas concentration analysis is carried out based on CRDS technology.Detector utilizes
Laser issues the laser of certain wavelength, and light swings intracavitary roundtrip declining, and declining, to swing in chamber be tested gas, declines to swing and adopt outside chamber
The transmitance of the output intensity changed over time with detector monitors, output intensity and reflecting mirror, absorptivity of intracavitary substance etc.
It is related.For the light of specific wavelength, the absorption coefficient of medium be it is certain, by measurement there are absorbing medium and there is no absorb
Ring-down time when medium can calculate the concentration of tested gas.
The sampling system of CRDS gas concentration detector swings optical cavity progress signal sampling for declining, and generally comprises to decline and swings letter
Number generation, sampling and sampled data processing.Concern often excessive sampling itself in existing system, such as the speed sampled
Degree, and ignoring sampling ought must closely link together with the control of laser, the caching of data just like it, therefore existing
System often encounters some problems in practice: 1) without machine at the beginning of the good laser cut-out of control, so that being difficult to height
Frequency acquisition swings signal and causes sample frequency low to declining, or capture signal signal-to-noise ratio it is not high, it is big to calculate deviation；2) do not have
The end opportunity of the good laser cut-out of control, so that the data of sampling are very little, it is difficult to calculate ring-down time, or too many, meter
It is too big to calculate time-consuming or deviation；3) without the caching opportunity of the good data of control, so that the data that caching is invalid, waste is cached, if
Operation is participated in be also possible to directly contribute mistake.
Summary of the invention
The sampling system of gas concentration detector includes the generation, sampling and data processing of signal, is to realize detection function
Significant components.Based on existing detector sampling system there are the problem of, propose a kind of need of CRDS gas concentration detector
A kind of sampling system asked and designed.
The invention is realized by the following technical scheme:
A kind of sampling system based on CRDS gas concentration detector, the system include state converter, ADC sampler,
Laser, data buffer and signal processor；
State converter is separately connected ADC sampler, laser, signal processor and data buffer and ADC sampling
It interconnects between device and data buffer, is interconnected between data buffer and signal processor；
State converter according to threshold value, the ADC sampler send sampling AD value and oneself state come transition status, and
Starting or closing, the starting or stoping of ADC sampler, the place of the caching of data and data of laser are determined according to the state
Reason.
The invention also provides a kind of method of sampling based on CRDS gas concentration detector, which includes as follows
Work step:
1) " starting " signal that state converter receives that signal processor is sent determines state according to " starting " signal
Converter switches to " monitoring " from " stopping "；
2) when state converter enters " monitoring " state, state converter issues " starting " to laser and ADC sampler
Instruction, laser opens laser after receiving " starting " instruction, after ADC sampler receives " starting " instruction, to optical cavity signal
It is sampled, and the AD value of sampling is transferred to state converter and data buffer；
3) under " monitoring " state, when the AD value that discovery comes from ADC sampler is greater than the threshold of threshold adjustment module setting
When value, state becomes " waiting "；
4) when state converter enters " waiting " state, state converter issues " triggering " instruction to threshold adjustment module and uses
In the adjustment of threshold value, and the given threshold that threshold adjustment module is sent is received, meanwhile, state converter is issued to laser
" closing " instruction issues " stopping " instruction to ADC sampler, and state becomes " acquiring " after " waiting "；
5) when state converter enters " acquisition " state, state converter issues " starting " instruction, state to ADC sampler
Converter issues " preservation " instruction to data buffer；
6) under " acquisition " state, sent when state converter 1 receives data buffer " caching full " signal or
When itself discovery AD value is less than acquisition end value, that is, enter " stopping " state；
7) when state converter enters " stopping " state, state converter issues " stopping " instruction to ADC sampler；
8) under " stopping " state, signal processor reads the data that data buffer saves, and is analyzed, calculated,
After the completion of data processing, signal processor issues " starting " signal to state converter, into the sample cyclic of a new round.
The method of sampling the invention also provides another kind based on CRDS gas concentration detector, the method for sampling include such as
Lower work step:
A kind of method of sampling of CRDS gas concentration detector, work step are as follows:
1) when system starts, state converter enters original state " etc. after receiving the enabling signal that signal processor is sent
To "；
2) after waiting for a period of time, terms and conditions enters after meeting " monitoring " state；
3) when state converter enters " monitoring " state, state converter issues " starting " to laser and ADC sampler
Instruction, laser opens laser after receiving " starting " instruction, after ADC sampler receives " starting " instruction, to optical cavity signal
It is sampled, and the AD value of sampling is transferred to state converter and data buffer；
4) under " monitoring " state, when the AD value that discovery comes from ADC sampler is greater than the threshold of threshold adjustment module setting
When value, state becomes " dozing off "；
5) when state converter enters " dozing off " state, state converter issues " triggering " instruction to threshold adjustment module and uses
In the adjustment of threshold value, and the given threshold that threshold adjustment module is sent is received, meanwhile, state converter is issued to laser
" closing " instruction issues " stopping " instruction to ADC sampler, and state becomes " acquiring " after " dozing off "；
6) when state converter enters " acquisition " state, state converter issues " starting " instruction, state to ADC sampler
Converter issues " preservation " instruction to data buffer；
7) under " acquisition " state, sent when state converter receives data buffer " caching full " signal or from
When body finds that AD value is less than acquisition end value, that is, enter " waiting " state；
8) when state converter enters " waiting " state, state converter issues " stopping " instruction to ADC sampler；
9) under " waiting " state, signal processor reads the data that data buffer saves, and is analyzed, calculated,
Data processing, after " waiting " state, state converter enters " monitoring " state, into the sample cyclic of a new round.
The present invention can generate to decline well to swing signal, acquisition valid data and quick and precisely calculates ring-down time, precision height,
Speed is fast, and additional, which eliminates special laser cut-out circuit in some existing systems, simplifies structure, drops
Low cost.
Detailed description of the invention
Fig. 1 show the structural block diagram of CRDS gas concentration detector sampling system of the invention.
Fig. 2 show the sub- state transition graph of state converter of the embodiment of the present invention 1.
Fig. 3 show the sub- state transition graph of state converter of the embodiment of the present invention 2.
Specific embodiment
In order to illustrate the embodiments of the present invention more clearly, embodiment is briefly described with reference to the accompanying drawing, attached drawing is used
In illustrating basic principle, to only illustrate for aspect needed for understanding basic principle.Attached drawing is not drawn to scale.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without making creative work it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
Sampling system proposed by the present invention based on CRDS gas concentration detector include decline swing signal generation, sampling and
The processing of data.As shown in Figure 1, the sampling system of CRDS gas concentration detector of the invention includes: state converter 1, ADC
Sampler 2, threshold adjustment module 4, laser 3, data buffer 5 and signal processor 6；Wherein, state converter 1 is according to AD
Value, threshold value and the state of itself carry out transition status, determine starting, shutdown and the recovery of laser 3, while determination data is slow
It deposits；ADC sampler 2 is used to carry out optical cavity signal sampling under the control of state converter 1；Threshold adjustment module 4 is for adjusting
Trigger the data value of laser cut-out；Laser 3 is for modulating, turning off and restoring laser；Data buffer 5 is for data cached；
Signal processor 6 carries out the analysis and calculating of signal for obtaining data from data buffer.
Embodiment 1:
As depicted in figs. 1 and 2, in the sampling system according to an embodiment of the present invention based on CRDS gas concentration detector
In, state converter 1 sends to other modules according to oneself state and instructs, and switches shape according to the signal of other module feedbacks
State, specific connection relationship and function are as follows between modules:
State converter 1: respectively with ADC sampler 2, threshold adjustment module 4, laser 3, signal processor 6 and data
Buffer 5 connects；According to the state of state converter 1, cooperate between modules；The state converter 1 includes " prison
Depending on ", " acquisition " and " stopping " three sub- states, wherein " monitoring " refer to monitor whether occur be greater than threshold value AD value；" acquisition "
Refer to acquisition AD value；" stopping ", which refers to, stops ADC sampling；State converter 1 can receive " starting " that signal processor 6 is sent
Instruction, to determine whether state switching to " monitoring " by " stopping "；State converter 1 can send " touching to threshold adjustment module 4
Hair " signal is used for the adjustment of threshold value, and receives the given threshold that threshold adjustment module 4 is sent；State converter 1 can be to ADC
Sampler 2 sends " starting " or " stopping " instruction and starts to sample with order ADC sampler 2 or stop sampling, and receives sampling
The AD value that device 2 is sent judges whether to switch the sub- state of state converter 1 by " monitoring " by comparing AD value and threshold value
To " acquisition "；State converter 1 is sharp to start or stop to the transmission of laser 3 " starting " or " closing " instruction according to oneself state
Light emitting；State converter 1 is issued according to oneself state saves the instruction beginning storing data of designation date buffer 5, and receives
" caching is full " signal that data buffer 5 is sent, according to whether receiving " caching is full " signal or itself whether finding AD
Value is less than acquisition end value, and state converter 1 determines whether to switch to " stopping " by " acquisition "；
ADC sampler 2: connecting with state converter 1 and data buffer 5, and the work of the module is in state converter
Under the instruction of signal, optical cavity signal is sampled, and the AD value of sampling is transferred to state converter 1, and by sampling
AD value is cached to data buffer 5；
Laser 3: it is connect with state converter 1；It declines and swings the generation of signal and depend on the control of starting and shutdown to laser
System, the module are exactly that being switched on and off for laser is completed under the instruction of state converter.
Threshold adjustment module 4: it is connect with state converter 1；It is low that the AD value to come from optical cavity sampling has height to have, which uses
In a suitable threshold value is arranged for state converter 1, to determine when to trigger laser shutdown；In order to keep adjusting thresholds suitable
Value, in inside modules design there are two timer, " triggering " signal that the two timers are issued with state converter is
Input, a timer setting time is long, and a timer setting time is short；It is detected within its time when in timer in short-term
Signal effectively " is triggered ", then promotion threshold value；When chronistor, effective " triggering " signal is not detected in device within its time, then is reduced
Threshold value；
Data buffer 5: it is connect with state converter 1, ADC sampler 2, signal processor 6；Data it is a large amount of and quick
Acquisition make to be difficult to realize the real-time processing of data, while understanding to decline and swinging the initial data of signal and be also necessary, thus and
Provided with data buffer, the work of data buffer 5 is to adopt ADC after receiving state converter " preservation " instruction
The AD value that sample device 2 is sent saves, and reads to signal processor 6；
Signal processor 6: it is connect with state converter 1, data buffer 5；It declines and swings after signal acquired and saved, only
Have required for being read by it, being only us finally after analysis and calculating；After the completion of data processing, which converts to state
Device 1 issues " starting " signal, into the sample cyclic of a new round.
The specific work steps of according to embodiments of the present invention 1 sampling system based on CRDS gas concentration detector is such as
Under:
1) " starting " signal that state converter 1 receives that signal processor 6 is sent determines shape according to " starting " signal
State converter 1 switches to " monitoring " from " stopping "；
2) when state converter 1 enters " monitoring " state, state converter 1 " is opened to laser 3 and the sending of ADC sampler 2
It is dynamic " instruction, laser 3 opens laser after receiving " starting " instruction, after ADC sampler 2 receives " starting " instruction, to optical cavity
Signal is sampled, and the AD value of sampling is transferred to state converter 1 and data buffer 5；
3) under " monitoring " state, when the AD value that discovery comes from ADC sampler 2 is greater than what threshold adjustment module 4 was arranged
When threshold value, state becomes " acquiring "；
4) when state converter 1 enters " acquisition " state, state converter 1 issues " triggering " to threshold adjustment module 4 and refers to
Show the adjustment for threshold value, and receives the given threshold that threshold adjustment module 4 is sent, meanwhile, state converter 1 is slow to data
Storage 5 issues " preservation " instruction, issues " closing " instruction to laser 3；
5) under " acquisition " state, sent when state converter 1 receives data buffer 5 " caching full " signal or
When itself discovery AD value is less than acquisition end value, that is, enter " stopping " state；
6) when state converter 1 enters " stopping " state, state converter 1 issues " stopping " instruction to ADC sampler 2；
7) under " stopping " state, signal processor 6 reads the data that data buffer 5 saves, and is analyzed, counted
It calculates, after the completion of data processing, signal processor 6 issues " starting " signal to state converter 1, and the sampling into a new round follows
Ring.
Wherein, the adjusting thresholds mode of the threshold adjustment module in step 4) is that threshold adjustment module includes two timing
Device, a timer setting time is long, and a timer setting time is short, the triggering that two timers are issued with state converter
" triggering " signal of laser shutdown is input, when detecting effective " triggering " signal within its time in timer in short-term, then
Promotion threshold value；When chronistor, effective " triggering " signal is not detected in device within its time, then reduces threshold value.
Embodiment 2:
Difference from Example 1 is the setting of state converter, and specific works relevant to state converter
Step.As shown in figure 3, state converter 1 includes " monitoring ", " dozing off ", " acquisition " and " waiting " four sub- states.Wherein, " etc.
To " refer to that waiting laser restores normal；" monitoring " refers to the AD value for monitoring whether occur being greater than threshold value；" dozing off ", which refers to, is closing
After disconnected laser, it is necessary to wait a bit of time, this short time does not need ADC sampling；" acquisition " refers to that sampling declines and swings signal AD
Value, the data which is down sampled to are effective.
When conversion between four sub- states is such that system starting, state converter receives opening for signal processor
Enter original state " waiting " after dynamic signal, enter after waiting for a period of time " monitoring " state；Under " monitoring " state, work as discovery
When the AD value to come from ADC sampler is greater than the threshold value of threshold adjustment module setting, state becomes " dozing off "；Into " dozing off " shape
State issues " triggering " to threshold adjustment module and indicates, after " dozing off " state, state becomes " acquiring "；In " acquisition " state
Under, when data buffer sends the signal of " caching is full " or itself discovery AD value is less than acquisition end value, that is, enter " etc.
To " state；Into after " waiting " state, state converter does not need to receive the order of signal processor, continues according to actual conditions
Into " monitoring " state, in cycles until detection terminates.While state is converted, state converter issues phase to other modules
The instruction answered.Indicate that other states give " stopping " indicating to ADC sampling module " starting " in " monitoring " or " acquisition " state；
" triggering " instruction is issued to threshold adjustment module into " dozing off " state；It is issued into " acquisition " state to data buffer
" preservation " instruction；" shutdown " instruction is issued to laser module in " dozing off ", " acquisition " and " waiting " state, is given in " monitoring " state
Laser module issues " starting " instruction.
Specific connection relationship and function between remaining module is substantially the same manner as Example 1, repeats no more.
The specific work steps of according to embodiments of the present invention 2 sampling system based on CRDS gas concentration detector is such as
Under:
1) when system starts, state converter 1 enters original state after receiving the enabling signal that signal processor 6 is sent
" waiting "；
2) after waiting for a period of time, terms and conditions enters after meeting " monitoring " state；
3) when state converter 1 enters " monitoring " state, state converter 1 " is opened to laser 3 and the sending of ADC sampler 2
It is dynamic " instruction, laser 3 opens laser after receiving " starting " instruction, after ADC sampler 2 receives " starting " instruction, to optical cavity
Signal is sampled, and the AD value of sampling is transferred to state converter 1 and data buffer 5；
4) under " monitoring " state, when the AD value that discovery comes from ADC sampler 2 is greater than what threshold adjustment module 4 was arranged
When threshold value, state becomes " dozing off "；
5) when state converter 1 enters " dozing off " state, state converter 1 issues " triggering " to threshold adjustment module 4 and refers to
Show the adjustment for threshold value, and receives the given threshold that threshold adjustment module 4 is sent, meanwhile, state converter 1 gives laser
3 issue " closing " instruction, issue " stopping " instruction to ADC sampler 2, state becomes " acquiring " after " dozing off "；
6) when state converter 1 enters " acquisition " state, state converter 1 issues " starting " instruction to ADC sampler 2,
State converter 1 issues " preservation " instruction to data buffer 5；
7) under " acquisition " state, sent when state converter 1 receives data buffer 5 " caching full " signal or
When itself discovery AD value is less than acquisition end value, that is, enter " waiting " state；
8) when state converter 1 enters " waiting " state, state converter 1 issues " stopping " instruction to ADC sampler 2；
9) under " waiting " state, signal processor 6 reads the data that data buffer 5 saves, and is analyzed, counted
It calculates, data processing, after " waiting " state, state converter 1 enters " monitoring " state, and the sampling into a new round follows
Ring.
Claims (9)
1. a kind of sampling system based on CRDS gas concentration detector, which includes state converter, ADC sampler, swashs
Light device, data buffer and signal processor；
State converter be separately connected ADC sampler, laser, signal processor and data buffer and ADC sampler and
It interconnects between data buffer, is interconnected between data buffer and signal processor；
State converter according to threshold value, the ADC sampler send sampling AD value and oneself state come transition status, and according to
The state determines the starting or closing, the starting or stoping of ADC sampler, the processing of the caching of data and data of laser.
2. the sampling system according to claim 1 based on CRDS gas concentration detector, it is characterised in that:
AD value for carrying out optical cavity signal sampling AD value, and is sent to state converter and data buffer storage by the ADC sampler
Device；
The laser, for modulating, turning off and restoring laser；
The data buffer, for data cached；
The signal processor carries out the processing of signal for obtaining data from data buffer.
3. the sampling system according to claim 1 based on CRDS gas concentration detector, it is characterised in that:
The system further includes threshold adjustment module, and the threshold adjustment module is connected with state converter, is swashed for adjusting triggering
The threshold value of light shutdown.
4. the sampling system according to claim 3 based on CRDS gas concentration detector, it is characterised in that:
Threshold adjustment module includes two timers, and a timer setting time is long, and a timer setting time is short, state
The signal that converter is sent to threshold adjustment module is the trigger signal for triggering laser shutdown.
5. the sampling system according to claim 3 or 4 based on CRDS gas concentration detector, it is characterised in that:
State converter includes " monitoring ", " acquisition " and " stopping " three sub- states, according to the state of state converter, Ge Gemo
It cooperates between block；
State converter can receive the instruction that signal processor is sent, to determine whether to switch to sub- state by " stopping "
" monitoring "；State converter can send " starting " or " stopping " instruction to ADC sampler and laser, and receive sampler transmission
The AD value come judges whether the sub- state of state converter switching to " acquisition " by " monitoring " by comparing AD value and threshold value；
State converter, which issues to save according to sub- state, instructs designation date buffer to start storing data, and receives data buffer hair
" caching is full " signal sent, according to whether receiving " caching is full " signal or whether itself finding that AD value is less than acquisition and terminates
Value, state converter determine whether to switch to " stopping " by " acquisition "；State converter can be sent to threshold adjustment module to be believed
It number is used for the adjustment of threshold value, and receives the given threshold that threshold adjustment module is sent.
6. the sampling system according to claim 3 or 4 based on CRDS gas concentration detector, it is characterised in that:
State converter include " monitoring ", " dozing off ", " acquisition ", " waiting " four sub- states, foundation state converter state,
It cooperates between modules；
When system starts, state converter can receive the enabling signal of signal processor, to determine whether to enter original state " etc.
To "；Into after " waiting " sub- state, enter after waiting for a period of time " monitoring " state；State converter receives sampler and sends
The AD value come judges whether the sub- state of state converter switching to " dozing off " by " monitoring " by comparing AD value and threshold value；
" triggering ", which is issued, to threshold adjustment module into " dozing off " state indicates and receive the setting threshold that threshold adjustment module is sent
It is worth, after " dozing off " state, state becomes " acquiring "；State converter, which issues to save according to sub- state, instructs designation date slow
Storage starts storing data, and receives " caching is full " signal that data buffer is sent, according to whether receiving " caching is full "
Whether signal itself finds that AD value is less than acquisition end value, and state converter determines whether to switch to " etc. by " acquisition "
To ".
7. a kind of method of sampling of CRDS gas concentration detector, work step are as follows:
1) state converter receives " starting " signal that signal processor is sent, and according to " starting " signal, determines that state is converted
Device switches to " monitoring " from " stopping "；
2) when state converter enters " monitoring " state, state converter issues " starting " instruction to laser and ADC sampler,
Laser opens laser after receiving " starting " instruction, and ADC sampler receives after " starting " instruct, and adopts to optical cavity signal
Sample, and the AD value of sampling is transferred to state converter and data buffer；
3) under " monitoring " state, when the AD value that discovery comes from ADC sampler is greater than the threshold value of threshold adjustment module setting,
State becomes " acquiring "；
4) when state converter enters " acquisition " state, state converter issues " triggering " instruction to threshold adjustment module and is used for threshold
The adjustment of value, and the given threshold that threshold adjustment module is sent is received, meanwhile, state converter is issued to data buffer
" preservation " instruction issues " closing " instruction to laser；
5) under " acquisition " state, the signal or itself hair of " caching is full " are sent when state converter receives data buffer
When existing AD value is less than acquisition end value, that is, enter " stopping " state；
6) when state converter enters " stopping " state, state converter issues " stopping " instruction to ADC sampler；
7) under " stopping " state, signal processor reads the data that data buffer saves, and is analyzed, calculated, data
After the completion of processing, signal processor issues " starting " signal to state converter, into the sample cyclic of a new round.
8. a kind of method of sampling of CRDS gas concentration detector, work step are as follows:
1) when system starts, state converter enters original state " waiting " after receiving the enabling signal that signal processor is sent；
2) after waiting for a period of time, terms and conditions enters after meeting " monitoring " state；
3) when state converter enters " monitoring " state, state converter issues " starting " instruction to laser and ADC sampler,
Laser opens laser after receiving " starting " instruction, and ADC sampler receives after " starting " instruct, and adopts to optical cavity signal
Sample, and the AD value of sampling is transferred to state converter and data buffer；
4) under " monitoring " state, when the AD value that discovery comes from ADC sampler is greater than the threshold value of threshold adjustment module setting,
State becomes " dozing off "；
5) when state converter enters " dozing off " state, state converter issues " triggering " instruction to threshold adjustment module and is used for threshold
The adjustment of value, and the given threshold that threshold adjustment module is sent is received, meanwhile, state converter issues " closing " to laser
Instruction issues " stopping " instruction to ADC sampler, and state becomes " acquiring " after " dozing off "；
6) when state converter enters " acquisition " state, state converter issues " starting " instruction, state conversion to ADC sampler
Device issues " preservation " instruction to data buffer；
7) under " acquisition " state, the signal or itself hair of " caching is full " are sent when state converter receives data buffer
When existing AD value is less than acquisition end value, that is, enter " waiting " state；
8) when state converter enters " waiting " state, state converter issues " stopping " instruction to ADC sampler；
9) under " waiting " state, signal processor reads the data that data buffer saves, and is analyzed, calculated, data
Processing, after " waiting " state, state converter enters " monitoring " state, into the sample cyclic of a new round.
9. the method for sampling according to claim 7 or 8, it is characterised in that: two timers of threshold adjustment module are with shape
" triggering " signal for the triggering laser shutdown that state converter issues is input, is detected within its time when in timer in short-term
Signal effectively " is triggered ", then promotion threshold value；When chronistor, effective " triggering " signal is not detected in device within its time, then is reduced
Threshold value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697733A (en) * | 2020-12-29 | 2021-04-23 | 浙江华电器材检测研究所有限公司 | Trace gas sampling device and method for cavity ring-down spectrometer |
| CN112903628A (en) * | 2021-01-25 | 2021-06-04 | 内蒙古光能科技有限公司 | Trace gas detection device in negative pressure state and detection method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130314715A1 (en) * | 2012-05-23 | 2013-11-28 | Honeywell International Inc. | Method and Apparatus for Correcting Bias Error in Ring-Down Spectroscopy |
| CN104515742A (en) * | 2014-12-17 | 2015-04-15 | 中国科学院长春光学精密机械与物理研究所 | Method for improving cavity ring-down time measurement accuracy |
| CN105043996A (en) * | 2014-04-29 | 2015-11-11 | 邓文平 | Spectral measurement method of spectrograph |
| CN208091906U (en) * | 2017-12-25 | 2018-11-13 | 内蒙古光能科技有限公司 | A kind of sampling system of CRDS gas concentration detectors |
-
2017
- 2017-12-25 CN CN201711423608.5A patent/CN109959623A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130314715A1 (en) * | 2012-05-23 | 2013-11-28 | Honeywell International Inc. | Method and Apparatus for Correcting Bias Error in Ring-Down Spectroscopy |
| CN105043996A (en) * | 2014-04-29 | 2015-11-11 | 邓文平 | Spectral measurement method of spectrograph |
| CN104515742A (en) * | 2014-12-17 | 2015-04-15 | 中国科学院长春光学精密机械与物理研究所 | Method for improving cavity ring-down time measurement accuracy |
| CN208091906U (en) * | 2017-12-25 | 2018-11-13 | 内蒙古光能科技有限公司 | A kind of sampling system of CRDS gas concentration detectors |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697733A (en) * | 2020-12-29 | 2021-04-23 | 浙江华电器材检测研究所有限公司 | Trace gas sampling device and method for cavity ring-down spectrometer |
| CN112903628A (en) * | 2021-01-25 | 2021-06-04 | 内蒙古光能科技有限公司 | Trace gas detection device in negative pressure state and detection method thereof |
| CN112903628B (en) * | 2021-01-25 | 2024-05-07 | 内蒙古光能科技有限公司 | Trace gas detection method under negative pressure state |
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