CN204556499U - The multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum - Google Patents
The multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum Download PDFInfo
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Abstract
The utility model relates to a kind of multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum, described system comprises: first and second laser instrument, first and second optical splitter, tested gas, reflector, the first ~ tetra-detector, laser instrument driver module, power management module, signal processing module, display module, A/D sampling and data processing module, host computer.First and second laser instrument sends the monochromatic light of two kinds of different wave lengths, and irradiates detected gas simultaneously.Original monochromatic light and convert electric signal to after the monochromatic light of detected gas delivers to detector simultaneously, tested gas concentration is obtained through signal transacting, A/D sampling and data processing, one tunnel send host computer to carry out analytic operation, and a road send display module to show gas concentration in real time.The utility model solves existing checkout equipment can only simultaneously to the problem that a kind of gas detects; Utilize simultaneously at a high speed, high precision Floating-point DSP solves the problems such as sampling rate is low, sampling precision is poor.
Description
Technical field
The utility model relates to tuning diode absorption spectroscopy techniques field, is specifically related to a kind of multi-channel high-speed data acquisition and processing system for tuning diode absorption spectrum.
Background technology
Traditional gas detection method is mainly based on chemical technology and snift experimental analysis.Emerge the analyser of many spot measurements in recent years, as taken metal oxide semiconductor as sensor and the electrochemical sensor of sensitive material.These sensors meet the needs of gas detect to a certain extent, but also have respective defect.First the scope of their measurements is less, can only measure the gas concentration near contact point.Secondly these methods are easily subject to the impact of the factors such as temperature, humidity, weather in the middle of testing process, and check point will change probe at set intervals.
Comparatively speaking, the gas content in absorption spectroscopy techniques measurement environment is utilized to have the incomparable advantage of other similar technique.The major advantage of tunable diode laser spectrum sensing technology for detection gas is adopted to have: sensing range is large, and adopt open path pattern, detecting distance can from several meters to a few km; Accuracy of detection is high, and gas concentration detection limit is lower than 1ppm (1ppm is 1,000,000/); Selectivity is high, selects suitable laser spectrum wave band, effectively can avoid the interference of other gas; A kind of online auto monitoring technology of Entirely contactless formula, relative to other technology safety and reliability; Fast response time, the response time is 0.05 second, can realize real-time detection to the change of gas concentration; The not easily impact of climate environment, does not need artificial nurse in real time.
But with regard to current domestic and international research, also nobody utilizes tunable diode absorption spectroscopy techniques to carry out the research of multichannel high-speed data acquisition and system for real-time signal processing simultaneously.This research will bring great convenience to environmental monitoring, can detect in real time dusty gas multiple in air simultaneously.
Summary of the invention
For the restriction that can only detect a kind of gas existed in prior art and the problem such as existing checkout equipment sampling rate is low, sampling precision is poor simultaneously, the utility model provides a kind of system simultaneously can carrying out multi-channel high-speed collection and real time signal processing.
For solving the problem, the invention provides a kind of multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum, this system utilizes 2 road laser instruments to launch monochromatic light simultaneously, realize detecting the concentration of two kinds of gas with various simultaneously, it is characterized in that, the system of stating comprises: the first laser instrument (1), second laser (2), first optical splitter (3), second optical splitter (4), tested gas (5), reflector (6), first detector (7), second detector (8), 3rd detector (9), 4th detector (10), laser instrument driver module (11), power management module (12), signal processing module (13), display module (14), A/D sampling and data processing module (15), host computer (16),
Laser instrument driver module (11) drive singal simultaneously produced needed for 2 road laser instruments delivers to the first laser instrument (1) and second laser (2) respectively; First laser instrument (1) and second laser (2) send the monochromatic light of two kinds of different wave lengths, deliver to the first optical splitter (3) and the second optical splitter (4) respectively, each optical splitter exports two paths of signals: lead up to after tested gas (5), project reflector (6), again back through tested gas (5) after reflection, and detected by the first detector (7) and the second detector (8); The 3rd detector (9) and the 4th detector (10) are directly delivered in one tunnel; Signal processing module (13) is delivered to after the laser signal of input is carried out opto-electronic conversion in the first ~ tetra-detector (7) ~ (10); Signal processing module (13) processes the signal that the first ~ tetra-detector (7) ~ (10) export, eliminate the undesired signal produced in signals transmission, obtain required harmonic signal simultaneously, and export A/D sampling and data processing module (15) to; A/D sampling and data processing module (15) convert the simulating signal that signal processing module (13) exports to digital signal and carry out densimeter calculation, one tunnel is sent to host computer (16) and carries out analytic operation, and a road send display module (14) to show in real time gas concentration; Power management module (12) according to the demand of each module to voltage signal, for disparate modules provides the voltage required for each normal operation.
Optionally, described first laser instrument (1) and second laser (2) all adopt and can produce live width receives line width Distributed Feedback Laser much smaller than tested gas (5) single suction.
Optionally, 32 high performance float-point DSP TMS320F28335 of what the main control chip of described A/D sampling and data processing module (15) adopted is TI, can sample to 4 road detector signals simultaneously simultaneously, and complete gas concentration and calculate.
Optionally, the sampling precision of described A/D sampling and data processing module (15) is 12, and the highest sample frequency is 12.5MHz;
Described A/D sampling module (15) has two kinds of sample modes: built-in AD sampling and external AD sample.
Optionally, described A/D sampling and data processing module (15) have wider sample range: built-in AD supports that sample range is 0 ~ 3V, and external AD sample range is-10V ~ 10V.
Optionally, the monochromatic original light intensity signal that described 3rd detector (9) the 4th and detector (10) send for detecting laser, the light intensity signal of monochromatic light after tested gas (5) that device (8) sends for detecting laser is surveyed in the first detector (7) and spy second; The light intensity signal that this No. 4 detector obtains obtains the concentration of tested gas (5) after signal and data processing.
Optionally, described 4 detector (7) ~ (10) PIN photodiode of all adopting service band corresponding with described laser instrument emission band.
Optionally, described laser instrument driver module (11) selects AT89C52 chip; This chip can produce the sawtooth wave of 5Hz and the sine wave signal of 5KHz; Described sawtooth signal is for driving first and second laser instrument (1), (2), and described sine wave signal is used for carrying out wavelength-modulated to first and second laser instrument (1), (2); First and second laser instrument (1), (2) are exported to after described sine wave and sawtooth wave superposition.
Optionally, described signal processing module (13) is made up of pre-amplification circuit, low-pass filter circuit, bandwidth-limited circuit and lock-in amplify circuit; First low-pass filtering and enlarge leadingly are carried out to input signal, the undesired signal that erasure signal produces in transmitting procedure, carry out bandpass filtering subsequently and obtain first harmonic and second harmonic signal, and lock-in amplify is carried out to second harmonic signal obtain DC component; Finally export the DC component of first harmonic and second harmonic, and deliver to A/D sampling and data processing module (15).
Optionally, described power management module (12) adopts 4 XZR05D12 power modules, for system provides required ± 12V, ± 5V and 3.3V voltage.
Compared with prior art, the utility model has the following advantages:
The utility model provides a kind of multi-channel high-speed collection for tuning diode absorption spectrum and real time signal processing system, and solving existing checkout equipment can only simultaneously to the problem that a kind of gas detects; Utilize the high speed of TI simultaneously, high precision Floating-point DSP solves the problems such as existing checkout equipment sampling rate is low, sampling precision is poor.
Accompanying drawing explanation
Fig. 1 is the block diagram of system described in the utility model, in figure: 1 is the first laser instrument, and 2 is second laser, 3 is the first optical splitter, and 4 is the second optical splitter, and 5 is tested gas, 6 is reflector, and 7 is the first detector, and 8 is the second detector, 9 is the 3rd detector, and 10 is the 4th detector, and 11 is laser instrument driver module, 12 is power management module, and 13 is signal processing module, and 14 is display module, 15 is A/D sampling and data processing module, and 16 is upper computer module.
Embodiment
The ultimate principle that the utility model carries out gas concentration measurement is, according to Lambert-Beer law, intensity is I
0(ν), frequency is the monochromatic light of ν, become by light intensity after absorbing gas:
I(ν)≈I
0(ν)(1-σ(ν)CL)
Namely through absorbing the light intensity after gas and gas concentration and to absorb light path linear.Above in formula σ (ν) for frequency be the absorption coefficient of ν place gas, C is gas concentration, and L is the length absorbing path.
System described in the utility model comprises: by first and second laser instrument, first and second optical splitter, tested gas, reflector, the optical system of the first ~ tetra-detector composition, laser instrument driver module, power management module, signal processing module, display module, A/D sampling and data processing module, host computer.Optical system sends the monochromatic light of two kinds of different wave lengths by first and second laser instrument, and two monochromic beams to irradiate after detected gas by mirror reflection to No. 2 detectors simultaneously; The Signal transmissions that detector receives is to signal processing module, signal processing module carries out low-pass filtering and enlarge leadingly to the received signal, carry out bandpass filtering subsequently and obtain first harmonic and second harmonic signal, then lock-in amplify is carried out to second harmonic signal obtain DC component.The DC component of first harmonic and second harmonic is exactly required signal; The DC component of the first harmonic that A/D sampling and data processing module export signal processing module and second harmonic is sampled, and calculate the concentration detecting gas, then a road is delivered to host computer and is carried out analytic operation, and a road send display module to show in real time gas concentration; Power management module is supplied to whole system and normally works required voltage.
Described system has strict demand to light source, and be necessary for strict monochromatic light, namely Light source line width is very narrow.And traditional infrared light supply live width generally has hundreds of GHz, because live width is very large, the absorption spectra obtained comprises the absorption line of tested gas and the absorption line of some other background gas usually simultaneously, can cause interference like this.First and second laser instrument have employed Distributed Feedback Laser for this reason, and this laser linewidth receives line width much smaller than tested gas single suction, fundamentally avoids the problem of gas cross interference.
The detection sensitivity stating system depends primarily on the selection at gas absorption peak.According to Lambert-Beer law, gas is directly proportional to the absorbance of gas to the absorption of light, and the absorbance of the gas of different frequency is different.Therefore, in order to obtain higher detection sensitivity, the frequency range of gas absorption peak height will be selected, and the interference of other gas in this frequency range will be avoided.
In described system, the light carrying gas concentration information sent by Distributed Feedback Laser, has to pass through photodetector and is converted into the concentration that electric signal could obtain gas.And the service band of photodetector correspondingly with laser instrument emission band must could obtain good Detection results.The photodetector that the utility model is selected is PIN photodiode.
In described system, the wavelength (frequency) of wavelength-modulation technique to laser instrument is adopted to modulate.Because the output wavelength of laser instrument is very responsive to the change of temperature, so the utility model adopts the working temperature of fixed laser to change the modulator approach of electric current.
In described system, that A/D sampling and data processing module adopt is the high precision of TI, the float-point DSP TMS320F28335 of two-forty.For processing sampled signal in real time, calculating the concentration etc. of gas.
Be described in detail as follows below in conjunction with drawings and Examples:
The composition of the multi-channel high-speed signal sampling and processing system for tuning diode absorption spectrum of the utility model embodiment as shown in Figure 1, described system comprises: the first laser instrument 1, second laser 2, first optical splitter 3, second optical splitter 4, tested gas 5, reflector 6, first detector 7, second detector the 8, three detector the 9, four detector 10, laser instrument driver module 11, power management module 12, signal processing module 13, display module 14, A/D sampling and data processing module 15, host computer 16.
Laser instrument driver module 11 drive singal simultaneously produced needed for 2 road laser instruments delivers to the first laser instrument 1 and second laser 2 respectively; First laser instrument 1 and second laser 2 send the monochromatic light of two kinds of different wave lengths, deliver to the first optical splitter 3 and the second optical splitter 4 respectively, each optical splitter exports two paths of signals: lead up to after tested gas 5, project reflector 6, again back through tested gas 5 after reflection, and detected by the first detector 7 and the second detector 8; The 3rd detector 9 and the 4th detector 10 are directly delivered in one tunnel; The first ~ tetra-detector 7 ~ 10 delivers to signal processing module 13 after the laser signal of input is carried out opto-electronic conversion; Signal processing module 13 processes the signal that the first ~ tetra-detector 7 ~ 10 exports, and eliminates the undesired signal produced in signals transmission, obtains required harmonic signal simultaneously, and exports A/D sampling and data processing module 15 to; A/D sampling and data processing module 15 convert the simulating signal that signal processing module 13 exports to digital signal and carry out densimeter calculation, and a road is sent to host computer 16 and carries out analytic operation, and a road send display module 14 pairs of gas concentrations to show in real time; Power management module 12 according to the demand of each module to voltage signal, for disparate modules provides the voltage required for each normal operation.Wherein,
First and second laser instrument 1,2: all adopt and can produce live width receives line width Distributed Feedback Laser much smaller than tested gas 5 single suction.
Reverberator 6, for reflecting the monochromatic light through tested gas 5, reflecting and after tested gas, being directly detected device 7 and detector 8 detects.
The first ~ tetra-detector 7 ~ 10: the monochromatic original light intensity signal that third and fourth detector 9,10 sends for detecting laser, the light intensity signal of monochromatic light after tested gas that first and second detector 7 and detector 8 send for detecting laser.The light intensity signal obtained by this No. 4 detector can carry out processing, calculating, and obtains the concentration of tested gas.The PIN photodiode that 4 detectors all adopt service band corresponding with described laser instrument emission band.
Laser instrument driver module 11, that master chip adopts is AT89C52, can produce two kinds of signals: one is low frequency sawtooth signal, be mainly used in driving laser instrument; A kind of is high frequency sinusoidal signal for carrying out wavelength-modulated to sawtooth signal.These two kinds of signals are carried out superpose rear drive laser instrument will make the first laser instrument and second laser produce simultaneously two kinds of different wave lengths monochromatic light, and the monochromatic antijamming capability produced strengthens.
Power management module 12, will be supplied to whole system and normally to work required ± 12V, ± 5V and 3.3V voltage.
Signal processing module 13, the signal that the signal for detecting detector carries out enlarge leadingly, low-pass filtering, amplification, bandpass filtering, lock-in amplify will be surveyed to obtain us.Pre-amplification circuit realizes amplifying the feeble signal that detector detects, and next carries out low-pass filtering, gets rid of noise signal.By the first harmonic of bandpass filtering filtering required for us and second harmonic signal, subsequently lock-in amplify is carried out to second harmonic and obtain us and calculate signal required for gas concentration.
A/D sampling and data processing module 15: main control chip adopts 32 high performance float-point DSP TMS320F28335 of TI, can sample to 4 road detector signals simultaneously simultaneously, and complete gas concentration calculating.Its sampling precision is 12, and the highest sample frequency is 12.5MHz; There is built-in AD to sample and external AD samples two kinds of sample modes, and there is wider sample range: built-in AD support sample range is 0 ~ 3V, and external AD sample range is-10V ~ 10V.
Host computer 16, for the sampled signal of A/D sampling and data processing module 15 being stored, and processes and Algorithm Analysis the large data stored after long-time sampling.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (10)
1. the multi-channel high-speed data acquisition and processing system of a tuning diode absorption spectrum, this system utilizes 2 road laser instruments to launch monochromatic light simultaneously, realize detecting the concentration of two kinds of gas with various simultaneously, it is characterized in that, described system comprises: the first laser instrument (1), second laser (2), first optical splitter (3), second optical splitter (4), tested gas (5), reflector (6), first detector (7), second detector (8), 3rd detector (9), 4th detector (10), laser instrument driver module (11), power management module (12), signal processing module (13), display module (14), A/D sampling and data processing module (15), host computer (16),
Laser instrument driver module (11) drive singal simultaneously produced needed for 2 road laser instruments delivers to the first laser instrument (1) and second laser (2) respectively; First laser instrument (1) and second laser (2) send the monochromatic light of two kinds of different wave lengths, deliver to the first optical splitter (3) and the second optical splitter (4) respectively, each optical splitter exports two paths of signals: lead up to after tested gas (5), project reflector (6), again back through tested gas (5) after reflection, and detected by the first detector (7) and the second detector (8); The 3rd detector (9) and the 4th detector (10) are directly delivered in one tunnel; The first ~ tetra-detector (7 ~ 10) delivers to signal processing module (13) after the laser signal of input is carried out opto-electronic conversion; Signal processing module (13) processes the signal that the first ~ tetra-detector (7 ~ 10) exports, eliminate the undesired signal produced in signals transmission, obtain required harmonic signal simultaneously, and export A/D sampling and data processing module (15) to; A/D sampling and data processing module (15) convert the simulating signal that signal processing module (13) exports to digital signal and carry out densimeter calculation, one tunnel is sent to host computer (16) and carries out analytic operation, and a road send display module (14) to show in real time gas concentration; Power management module (12) according to the demand of each module to voltage signal, for disparate modules provides the voltage required for each normal operation.
2. the multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum according to claim 1, it is characterized in that, described first laser instrument (1) and second laser (2) all adopt and can produce live width receives line width Distributed Feedback Laser much smaller than tested gas (5) single suction.
3. the multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum according to claim 1, it is characterized in that, 32 high performance float-point DSP TMS320F28335 of what the main control chip of described A/D sampling and data processing module (15) adopted is TI, can sample to 4 road detector signals simultaneously simultaneously, and complete gas concentration calculating.
4. the multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum according to claim 3, is characterized in that, the sampling precision of described A/D sampling and data processing module (15) is 12, and the highest sample frequency is 12.5MHz;
Described A/D sampling module (15) has two kinds of sample modes: built-in AD sampling and external AD sample.
5. the multi-channel high-speed data acquisition and processing system of the tuning diode absorption spectrum according to claim 1,3,4 any one, it is characterized in that, described A/D sampling and data processing module (15) have wider sample range: built-in AD supports that sample range is 0 ~ 3V, and external AD sample range is-10V ~ 10V.
6. the multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum according to claim 1, it is characterized in that, the monochromatic original light intensity signal that described 3rd detector (9) the 4th and detector (10) send for detecting laser, the light intensity signal of monochromatic light after tested gas (5) that device (8) sends for detecting laser is surveyed in the first detector (7) and spy second; The light intensity signal that this No. 4 detector obtains obtains the concentration of tested gas (5) after signal and data processing.
7. the multi-channel high-speed data acquisition and processing system of the tuning diode absorption spectrum according to claim 1 or 6, it is characterized in that, the PIN photodiode that described 4 detectors (7 ~ 10) all adopt service band corresponding with described laser instrument emission band.
8. the multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum according to claim 1, is characterized in that, described laser instrument driver module (11) selects AT89C52 chip; This chip can produce the sawtooth wave of 5Hz and the sine wave signal of 5KHz; Described sawtooth signal is for driving first and second laser instrument (1,2), and described sine wave signal is used for carrying out wavelength-modulated to first and second laser instrument (1,2); First and second laser instrument (1,2) is exported to after described sine wave and sawtooth wave superposition.
9. the multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum according to claim 1, it is characterized in that, described signal processing module (13) is made up of pre-amplification circuit, low-pass filter circuit, bandwidth-limited circuit and lock-in amplify circuit; First low-pass filtering and enlarge leadingly are carried out to input signal, the undesired signal that erasure signal produces in transmitting procedure, carry out bandpass filtering subsequently and obtain first harmonic and second harmonic signal, and lock-in amplify is carried out to second harmonic signal obtain DC component; Finally export the DC component of first harmonic and second harmonic, and deliver to A/D sampling and data processing module (15).
10. the multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum according to claim 1, it is characterized in that, described power management module (12) adopts 4 XZR05D12 power modules, for system provides required ± 12V, ± 5V and 3.3V voltage.
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| CN105203485A (en) * | 2015-11-09 | 2015-12-30 | 上海禾赛光电科技有限公司 | Detection device and method for indoor gas |
| CN107305184A (en) * | 2016-04-19 | 2017-10-31 | 卡斯卡德技术控股有限公司 | Laser detection system and method |
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| CN108318427A (en) * | 2018-05-09 | 2018-07-24 | 杭州纳清光电科技有限公司 | Surrounding air detection device |
| CN110715906A (en) * | 2018-07-13 | 2020-01-21 | 横河电机株式会社 | Spectrum measuring apparatus and spectrum measuring method |
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