CN202814843U - Gas particle concentration measurement device based on broadband linear frequency modulation ultrasounds - Google Patents
Gas particle concentration measurement device based on broadband linear frequency modulation ultrasounds Download PDFInfo
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- CN202814843U CN202814843U CN 201220493153 CN201220493153U CN202814843U CN 202814843 U CN202814843 U CN 202814843U CN 201220493153 CN201220493153 CN 201220493153 CN 201220493153 U CN201220493153 U CN 201220493153U CN 202814843 U CN202814843 U CN 202814843U
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Abstract
The utility model discloses a gas particle concentration measurement device based on broadband linear frequency modulation ultrasounds. The gas particle concentration measurement device comprises an operation module, a processing module, a transceiver module, an output module and a measurement cavity, wherein the operation module inputs corresponding parameters, and adjusts the distances among transceiver arrays; the processing module generates LFM (linear frequency modulation) signals of all sections according to the parameter information; a digital-to-analog converter converts the signals into emission signals, and transmits the emission signals to a transmitting transducer array; the transmitting transducer array emits the emission signals; a receiving transducer array receives measurement signals, and transmits the measurement signals to a processing module; an analog-digital converter in the processing module converts the received signals into digital signals and then transmits the digital signals to a digital processor; the digital processor carries out spectrum estimation on the received signals of each receiving transducer, eliminates signals outside the frequency range of each transducer through filtering, then measures the particle concentration, and finally transmits the measured value of the particle concentration to the output module; and the output module outputs the result. The gas particle concentration measurement device has the advantages of wide application range, high measurement precision, simple structure, low cost, convenience in use and the like.
Description
Technical field
The utility model relates to gas particles measurement of concetration technical field, is specifically related to based on the ultrasonic gas particles apparatus for measuring concentration of broadband linear frequency modulation.
Background technology
In recent years air pollution is day by day serious, and the poisonous and harmful substances of discharging is having a strong impact on air quality in the human being's production life.Simultaneously, human environmental consciousness increases, so people more and more pay attention to the monitoring to air quality, has also just proposed the demand that the gas middle particle concentration is measured.In addition, the gas particles measurement of concetration all is widely used to fields such as climate change research and volcano detections.Granule density measuring method commonly used has lingemann blackness method, sampling method, capacitance method, charge method, rays method, process tomographic imaging method, optical means, ultrasonic method etc. at present.Wherein lingemann blackness method and sampling method belong to the method for off-line monitoring, the lingemann blackness method refers to manual observation flue dust blackness and relatively determines dust concentration with the lingemann blackness table, this method can only provide the valuation of a relative size, precision is low, and is only applicable to the observational measurement of coal smoke discharging; Sampling method refers to extract according to the constant speed principle the representative flue gas of certain volume, and the solid particle that gathers is weighed, and draws concentration with weigh divided by gas volume, and the constant speed principle of the method often is difficult to realize, and can not carries out continuous measurement.In the method for real time on-line monitoring, capacitance method and charge method refer to utilize the correlativity of granule density and electric capacity and amount of electrostatic charge, thereby measure concentration by Detection capacitance amount and the quantity of electric charge, physical property and gas that these two kinds of methods are subject to particle transmit condition influence, and are that interfering type is measured; Rays method refers to measure concentration by the decay of the radiant rays that measure to see through medium, the danger that this method exists radioactive radiation to reveal, so equipment expensive, operating personnel are required height; The process tomographic imaging method refers to measure by the visual image that obtains the multicomponent mixture that transmits in the pipeline method of granule density distributed in three dimensions, and this method implements more complicated.
Optics rule comparatively commonly used is to utilize the decay of light and scattering to measure granule density in addition, specifically comprise nephelometry, light Fluctuation Method and scattering method etc., but optical device is meticulous, equipment cost is high, and the decay of light is very serious in high concentration particle is measured, and has therefore also limited the application of optical method in some scenes.Ultrasonic method is to utilize sound wave to propagate in gas, according to acoustic attenuation, particle the effects such as scattering of sound are measured granule density, the ultrasonic method penetrability is better than light, being suitable for high concentration particle measures, and equipment cost is also low than optical device, and have wider frequency range, so ultrasonic method there is its outstanding superiority.; although ultrasonic have a wider frequency range; but utilize at present in the method for ultrasonic measurement granule density major part to utilize simple signal or narrow pulse signal (CN201096703), although narrow pulse signal have broadband properties it and be not easy to produce, and be not frequency spectrum constant amplitude broadband signal; Even broadband signal is arranged in addition, present measurement mechanism major part is utilized a transducer, and the bandwidth of receiving and transmitting signal is subject to the transducer restriction.Therefore present ultrasonic measurement method and device are to be improved aspect the ultrasonic wideband of performance, are difficult to the concentration of various particles in the comparatively comprehensive measurement gas, comprehensively distribution of particles in the measurement gas.
The utility model is based on broadband LFM(linear frequency modulation) gas particles concentration measuring method and the device of ultrasonic signal, can solve well the deficiency of present technology.Because the utility model utilizes the LFM signal as measuring-signal and utilizes the transducer array transmitting-receiving, therefore can realize the measuring-signal of approximate frequency spectrum constant amplitude wideband, and produce easily and transmitting-receiving.In addition, device of the present utility model utilizes acoustic absorbant, further improves the precision of measuring.
The utility model content
The purpose of this utility model is to overcome existing method and measurement mechanism based on ultrasonic method measurement gas granule density and is difficult to produce and the deficiency of receiving and dispatching broadband signal, provides based on broadband linear frequency modulation ultrasonic gas particles concentration measuring method and device.The method is utilized LFM ultrasonic signal structure measuring-signal, by carrying out to received signal analysis of spectrum, measures the granule density of various sizes in the gas according to attenuation spectrum.In addition, the utility model device utilizes acoustic absorbant to improve measuring accuracy.The utility model is achieved through the following technical solutions.
Based on the ultrasonic gas particles apparatus for measuring concentration of broadband linear frequency modulation, comprise operational module, processing module, transceiver module, output module and measurement chamber,
Operational module is connected with processing module, is mainly used in man-machine interaction, selects emissive power, isodisperse according to application scenarios
N, the number of times w of each transducer transmitted signal and each transducer transmit and receive the frequency range be responsible for and original frequency, coefficient of frequency modulation and the signal time length of corresponding band signal is respectively
,
With
Processing module and operational module, transceiver module, and output module links to each other, processing module is carried out data according to the instruction of operational module input and is processed, send and receive waveform and the data of measuring-signal by transceiver module, data analysis is processed the measurement result that draws granule density to received signal, and the result is transferred to output module output;
Transceiver module links to each other with processing module, is positioned to measure the chamber, and it comprises transmission transducer array and receiving transducer array, be responsible for obtaining the emission that transmits from digital to analog converter, and the reception signal is passed to the analog to digital converter conversion; The sending and receiving transducer array can be by slide adjusting the distance between the transmitting-receiving array, to adapt to different applicable cases, decays and shorten distance between them when strong and improve and receive signal amplitude, increases distance when decay is weak and improve measuring accuracy;
Output module links to each other with processing module, is used for the gas particles concentration results that the Graphics Processing module is measured, and perhaps testing result is given other system or equipment.
Further, described measurement chamber employing acoustic absorbant manufacturing.
Further, processing module mainly comprises digital processing unit, digital to analog converter and analog to digital converter, and wherein digital processing unit sends digital to analog converter to according to the LFM signal that the instruction of operational module produces each section; In addition, digital processing unit obtains the data that receive signal and composes estimation, filtering and granule density measurement from analog to digital converter; The result that then will measure sends output module output to; Digital to analog converter and analog to digital converter serve as the bridge of digital processing unit and transceiver module, and the transceiver module transmission is passed in the signal digital-to-analog conversion that digital processing unit produces, and carry out analog to digital conversion from transceiver module reception signal and pass to digital processor processes.
The groundwork flow process of said apparatus is as follows: the operator adjusts the distance L between the transmitting-receiving array by parameter corresponding to operational module input.Processing module produces each section LFM signal according to parameter information, and digital to analog converter converts to and transmits, and sends the transmitting transducer arrays emission to.Then receiving transducer array received measuring-signal sends processing module to.Analog to digital converter in the processing module will receive signal and convert digital signal to and pass to digital processing unit.Digital processing unit composes the reception signal of each receiving transducer to estimation, rejects each transducer by filtering and is responsible for the outer signal of frequency range, carries out granule density again and measures.Send the granule density value of measuring to the output module Output rusults at last.
Based on the ultrasonic gas particles concentration measuring method of broadband linear frequency modulation, comprise the steps: the first, utilize linear FM signal (LFM) structure measuring-signal, measuring-signal is carried out launching from the emission ultrasound transducer array after the digital-to-analog conversion; The second, receive ultrasound transducer array and detect ultrasonic signal, obtain receiving signal; The 3rd, carry out to received signal analog to digital conversion, and then compose to received signal estimation, obtain receiving the decay spectra of signal; The 4th, the decay spectra that obtains is analyzed, determine the dimension of corresponding particle from frequency, determine the concentration of corresponding dimension particle according to mathematical modeling or experimental formula from the spectrum amplitude of this frequency.
Described linear FM signal (LFM) signal can be expressed as:
In the formula, A is the amplitude of signal,
Be original frequency, b is coefficient of frequency modulation, and T is the time span of signal, wherein
, b and T determined that the frequency range of linear FM signal is:
According to the frequency range of parameter control transmitted signal, by configuration parameter, the generation frequency range [
,
] the LFM signal as measuring-signal.
Above-mentioned based in the ultrasonic gas particles concentration measuring method of broadband linear frequency modulation, further, with frequency range [
,
] the LFM signal be divided into the multistage frequency [
,
), [
,
) ... [
,
] the LFM signal configuration, different probes are sent out the LFM signal of different frequency scopes; Determined initial frequency and the highest frequency of each frequency range section, thereby the LFM signal that definite each transducer sends
, b and T.
Above-mentioned based in the ultrasonic gas particles concentration measuring method of broadband linear frequency modulation, further, each probe is sent out set point number w with the LFM signal of same frequency band, supposes that original frequency, coefficient of frequency modulation and the signal time length of i transducer is respectively
,
With
, namely [0,
) send out once the LFM measuring-signal of the frequency band that this transducer is responsible for, [
,
) again send out once again, rule is sent w time successively.
Above-mentioned based in the ultrasonic gas particles concentration measuring method of broadband linear frequency modulation, further, described receiving transducer array received is corresponding to send the signal that transducer array sends, and correspondence refers to that receiving transducer i receives the signal that sends transducer i emission, the frequency range of this signal be [
,
); With the receiving transducer array received to the signal of each band frequency scope do respectively analog to digital conversion and spectrum is estimated, obtain the decay spectrogram of each band frequency.If receiving transducer receives the signal of being responsible for beyond the frequency range and then filters with digital filter, with the decay chart adding of each band frequency obtain a frequency range for [
,
] the decay spectrogram.
Above-mentioned based in the ultrasonic gas particles concentration measuring method of broadband linear frequency modulation, further, receive in the decay spectra of signal,
BFor receiving the amplitude peak of signal, set constant
N, with frequency band [
,
] be divided into
NEqual portions, the distance of every portion is
Wherein
jThe frequency range of equal portions be [
,
+
],
Satisfy
=
+
The particle dimension that this band frequency is corresponding is
=
/
, the attenuation amplitude that detects this equal portions frequency according to decay spectra for (
-
), converse the granule density of corresponding dimension by attenuation amplitude or attenuation slope
, finally draw [
/
,
/
] concentration of various particles in the dimension scope.
Compared with prior art, the utility model is applied widely, and measuring accuracy is high, and device is simple, and is with low cost, easy to use.
First, the utility model has overcome existing ultrasonic method and has measured the deficiency that the granule density technology is difficult to produce and launch broadband signal, adopt LFM signal configuration measuring-signal, utilize the transmitting-receiving transducer array that measuring-signal is transmitted and received, make measuring-signal that the amplitude versus frequency characte of approximate constant amplitude and the characteristics of super wideband be arranged, just can draw the concentration of the sizable various particles of dimension scope by one-shot measurement.
The second, the utility model is subjected to the restriction of particle properties and environmental parameter little.Therefore the utility model can measure the particle of various chemical constitutions based on the basic measurement gas particles concentration of ultrasonic method, and the measurement of applicable various environmental parameters.
The 3rd, it is wide that the utility model can be measured the concentration range of particle.Because ultrasonic penetrability is good, and therefore transmitting-receiving transducer array column pitch of the present utility model can measure the high concentrations of gas particle from adjusting, and remedied the deficiency that optical means is difficult to measure high concentration particle.
The 4th, the utility model measuring accuracy is high.Along with the digital signal processing maturation of spectrum estimation, filtering technique particularly, granule density of the present utility model is measured can reach higher precision.In addition, acoustic absorbant is used in measurement of the present utility model chamber, has lowered the multipath reflection sound ray and has arrived the receiving transducer array to the impact of measurement result, further improves precision.
The 5th, the utility model is with low cost, feasibility is strong.The required parts of the utility model device all are easy to obtain, and with respect to the optical device that optical means adopts, this installation cost is cheap.In addition, the measuring-signal LFM signal that the utility model adopts produces easily, can produce with software by DSP, also can produce by hardware.
Description of drawings
Device synoptic diagram when Fig. 1 is the utility model transceiver module employing wired connection mode;
Fig. 2 is that the utility model is measured the chamber front cross-sectional view of (comprising the transceiver module part of measuring in the chamber);
Device synoptic diagram when Fig. 3 is the utility model transceiver module employing wireless connections mode;
Fig. 4 is the time-frequency figure of emission measurement signal;
Fig. 5 is the spectrum diagram of emission measurement signal;
Fig. 6 is for receiving the decay spectra synoptic diagram of measuring-signal;
Fig. 7 is the workflow synoptic diagram of the utility model device.
Embodiment
Hereinafter by reference to the accompanying drawings embodiment of the present utility model (device is concrete to be consisted of and the job step of the utility model device) is further described, below only for for example, be not used in restriction protection domain of the present utility model.
Fig. 1 is for realizing the synoptic diagram of said apparatus wired connection, this device mainly comprises operational module 110, processing module 120, transceiver module 130, output module 140 and measures 150 5 modules in chamber, modules connects by the mode of Fig. 1, and transceiver module 130 places to be measured in the chamber 150.The digital processing unit 121 of processing module can be with realizations such as dsp chip or ARM; Digital to analog converter 122 and analog to digital converter 123 also can be realized with dsp chip.Transmitting transducer arrays 131 in the transceiver module can realize with several vertical ultrasonic transducers of putting with receiving transducer array 132, each ultrasonic transducer in the array can be received and dispatched the ultrasonic signal of different frequency section, and the number of ultrasonic transducer is decided according to the scope of application scenarios and measurement in the array.In addition, transceiver module with can adopt wired and wireless two kinds of connected modes being connected of processing module, when adopting the wireless connections mode, such as Fig. 3, can utilize the 2.4G radio-frequency (RF) receiving and transmission module to realize, one places and measures in the chamber 233, one outside the measurement chamber 224.
Based on the ultrasonic gas particles concentration measuring method of broadband linear frequency modulation, key step is as follows: the first, utilize linear FM signal (LFM) structure measuring-signal, and measuring-signal is carried out launching from the emission ultrasound transducer array after the digital-to-analog conversion; The second, receive ultrasound transducer array and detect ultrasonic signal, obtain receiving signal; The 3rd, carry out to received signal analog to digital conversion, and then compose to received signal estimation, obtain receiving the decay spectra of signal; The 4th, the decay spectra that obtains is analyzed, determine the dimension of corresponding particle from frequency, determine the concentration of corresponding dimension particle according to mathematical modeling or experimental formula from the spectrum amplitude of this frequency.
In the said method, described linear FM signal (LFM) signal can be expressed as:
(formula 1)
In the formula, A is the amplitude of signal,
Be original frequency, b is coefficient of frequency modulation, and T is the time span of signal, wherein
, b and T determined that the frequency range of linear FM signal is:
Described linear FM signal produces easily, can simply control according to parameter the frequency range of transmitted signal, and have approximate rectangular amplitude versus frequency characte, is suitable for very much the analysis of wideband receiving signal attenuation spectrogram.Therefore, by configuration parameter, be easy to produce frequency range [
,
] the LFM signal as measuring-signal.
But owing to a ultrasonic transducer can only send the ultrasonic signal of certain frequency scope and can not send very wide frequency range, measuring-signal that therefore will be very wide [
,
] be divided into the multistage frequency [
,
), [
,
) ... [
,
] the LFM signal configuration, different probes are sent out the LFM signal of different frequency scopes.As long as determined initial frequency and the highest frequency of each frequency range section, just can determine LFM signal that each transducer sends
, b and T.
In order to increase the precision of measurement, can send in short-term LFM signal of multistage, namely each probe is sent out the LFM signal of same frequency band w time, supposes that original frequency, coefficient of frequency modulation and the signal time length of i transducer is respectively
,
With
, namely [0,
) send out once the LFM measuring-signal of the frequency band that this transducer is responsible for, [
,
) again send out once again ... the time frequency analysis figure of the measuring-signal of constructing as shown in Figure 4.The frequency spectrum of described measuring-signal (stack of the spectrogram of each transducer) be have approximate rectangular amplitude versus frequency characte frequency range for [
,
] frequency spectrum, spectrogram is as shown in Figure 5.
In the said method, described receiving transducer array received is corresponding to send the signal that transducer array sends, and correspondence refers to that receiving transducer i receives the signal that sends transducer i emission, the frequency range of this signal be [
,
).With the receiving transducer array received to the signal of each band frequency scope do respectively analog to digital conversion and spectrum is estimated, obtain the decay spectrogram of each band frequency.If receiving transducer receives the signal of being responsible for beyond the frequency range and then filters with digital filter, with the decay chart adding of each band frequency can obtain a frequency range for [
,
] the decay spectrogram.
In the above-mentioned decay spectrogram, because ultrasonic measuring signal is subject to the effect impacts such as gas particles reflection, scattering, diffraction in the gas communication process, have corresponding decay, concrete influence process is as described below.When particle dimension during less than the ultrasound wave wavelength, the particle that ultrasonic propagation generation diffraction effect, ultrasonic wave energy are walked around this dimension continues to propagate.When particle dimension during greater than the ultrasound wave wavelength, can reflect at the interphase ultrasound wave of gas and particle, scattering and refraction.Suppose
The incident wave amplitude,
Be the reflection wave amplitude, the normal direction acoustic impedance of gas is
, the normal direction acoustic impedance of particle is
, according to Huygens' principle and reflection law, reflection wave and refraction wave amplitude and two medium acoustic impedances satisfy following relation:
In general, the acoustic impedance of solid or liquid particles is much larger than the gas acoustic impedance, therefore when particle dimension during greater than the ultrasound wave wavelength, most of energy of sound wave is reflected or scattering (when particle is irregular) is fallen, and energy seldom can see through particle continuation propagation forward.When particle dimension and ultrasound waves appearance are near, can reflect simultaneously at the interphase ultrasound wave of gas and particle, the effect of scattering, refraction and diffraction.
The dimension of supposing certain particle is
, the velocity of sound is
, then frequency exists
f=
/
Above ultrasound wave all can be subject to decay to a certain degree, and the granule density of this dimension is higher, and decay is just more severe.Since there is the particle of various dimensions in the gas, the ultrasound wave that the higher wavelength of frequency is less, the reflection or the scattering that are subject to different dimension particles are just more, and the decay of accumulative total is just larger.
The decay spectra that receives as shown in Figure 6, wherein
BFor receiving the amplitude peak of signal, can set constant
N, with frequency band [
,
] be divided into
NEqual portions, the distance of every portion is
Wherein
jThe frequency range of equal portions be [
,
+
],
Satisfy
=
+
The particle dimension that this band frequency is corresponding is
=
/
, the attenuation amplitude that detects this equal portions frequency according to decay spectra for (
-
), can converse by attenuation amplitude or attenuation slope the granule density of corresponding dimension by mathematical modeling or relevant experimental formula
Finally can draw [
/
,
/
] concentration of various particles in the dimension scope.
In the said method,
NSize can determine according to the practical application sight, also can be according to application demand, with some frequency band behind the equal portions reconsolidate again to measure be concerned about the concentration of particle.For example, measure that diameter is less than or equal to 2.5 microns particle in the PM2.5(atmosphere) concentration, in the air
Be 340m/s, pass through formula
f=
/
Find out its respective frequencies, namely analyze 136MHz with the decay of upper frequency, also just can be with the synthetic one section calculating of carrying out again concentration of each the band frequency equal portions more than the 136MHz.
The job step of this example is as shown in Figure 7, and is specific as follows:
Step 1: according to measuring needs, choose the distance L between the transmitting-receiving transducer array, the amplitude A that transmits (or emissive power), isodisperse
N, the number of times w(that each transducer transmits does not have can give some default value for these variablees first in the situation of priori conditions).And the frequency range that each transducer in definite array is responsible for, and then determine that each transducer sends the original frequency of measuring-signal
, coefficient of frequency modulation
With signal time length
The input operation parameter, whether system detects operational module operation requests, if operation requests is arranged then processing module response request preservation parameter.
Applicating example: suppose that dimension is the concentration of the particle of 1 μ m-10 μ m in the measurement air, acoustic velocity is 340m/s in the air, by
f=
/
Frequency range that must be corresponding [
,
] be [34MHz, 340MHz].If the transducer relative bandwidth of using is 80%, then can cover this frequency band with three transducers, the frequency band that these three transducers are responsible for respectively can for [30MHz, 70MHz), [70MHz, 163MHz), [163MHz, 380MHz].Then can determine according to these frequency bands the original frequency of every section LFM signal
, coefficient of frequency modulation
With signal time length
Step 2: raise and measure the chamber upper bottom surface, again cover after adjusting the distance of transmitting-receiving transducer array, then slowly the left and right side cap of carriage makes their closed, measures the measurement space that becomes a sealing in the chamber this moment.By signal that begins to measure of operational module input.
Step 3: processing module receives that the beginning measuring-signal then produces each section LFM signal according to input parameter (comprising A, w, the original frequency of each segment signal, coefficient of frequency modulation, signal time length).
Step 4: the LFM signal that produces is sent to digital to analog converter, converts simulating signal to and send transceiver module to, transceiver module sends measuring-signal by sending transducer array.
Step 5: receiving transducer receives measuring-signal, sends signal to analog to digital converter, and the frequency after analog to digital converter will be changed sends digital signal processor processes to.
Step 6: digital signal processor composes the reception signal of each receiving transducer to estimation, and each is estimated that spectrum filters this transducer with bandpass filter and is responsible for the outer signal of frequency range.
Step 7: filtered each estimated the spectrum stack, obtain total decay spectra, and according to method noted earlier decay spectra is divided into
NEqual portions, frequency range and the amplitude fading thereof of finding out correspondence according to application demand go out the concentration of corresponding dimension particle with empirical formulas, and then determine dimension and the corresponding concentration of various particles.
Step 8: send the measurement result (comprising dimension and corresponding concentration) of granule density to output module, output module is exported the result.
Claims (3)
1. based on the ultrasonic gas particles apparatus for measuring concentration of broadband linear frequency modulation, it is characterized in that comprising operational module, processing module, transceiver module, output module and measurement chamber,
Operational module is connected with processing module, is mainly used in man-machine interaction, selects emissive power, isodisperse according to application scenarios
N, the number of times w of each transducer transmitted signal and each transducer transmit and receive the frequency range be responsible for and original frequency, coefficient of frequency modulation and the signal time length of corresponding band signal;
Processing module and operational module, transceiver module, and output module links to each other, processing module is carried out data according to the instruction of operational module input and is processed, send and receive waveform and the data of measuring-signal by transceiver module, data analysis is processed the measurement result that draws granule density to received signal, and the result is transferred to output module output;
Transceiver module links to each other with processing module, is positioned to measure the chamber, and it comprises transmission transducer array and receiving transducer array, be responsible for obtaining the emission that transmits from digital to analog converter, and the reception signal is passed to the analog to digital converter conversion; The sending and receiving transducer array can be by slide adjusting the distance between the transmitting-receiving array, to adapt to different applicable cases, decays and shorten distance between them when strong and improve and receive signal amplitude, increases distance when decay is weak and improve measuring accuracy;
Output module links to each other with processing module, is used for the gas particles concentration results that the Graphics Processing module is measured, and perhaps testing result is given other system or equipment.
2. measurement mechanism according to claim 1 is characterized in that the manufacturing of described measurement chamber employing acoustic absorbant.
3. measurement mechanism according to claim 1 is characterized in that processing module mainly comprises digital processing unit, digital to analog converter and analog to digital converter, and wherein digital processing unit sends digital to analog converter to according to the LFM signal that the instruction of operational module produces each section; In addition, digital processing unit obtains the data that receive signal and composes estimation, filtering and granule density measurement from analog to digital converter; The result that then will measure sends output module output to; Digital to analog converter and analog to digital converter serve as the bridge of digital processing unit and transceiver module, and the transceiver module transmission is passed in the signal digital-to-analog conversion that digital processing unit produces, and carry out analog to digital conversion from transceiver module reception signal and pass to digital processor processes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729967A (en) * | 2015-03-31 | 2015-06-24 | 无锡市崇安区科技创业服务中心 | Ultrasonic-based sludge concentration monitoring system |
| CN104749077A (en) * | 2015-03-31 | 2015-07-01 | 无锡市崇安区科技创业服务中心 | Suspension particle concentration detection system based on ultrasonic waves |
| CN105738469A (en) * | 2016-04-13 | 2016-07-06 | 华南理工大学 | Liquid suspended matter concentration measuring method and device based on ultrasonic power spectrum estimation |
-
2012
- 2012-09-22 CN CN 201220493153 patent/CN202814843U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729967A (en) * | 2015-03-31 | 2015-06-24 | 无锡市崇安区科技创业服务中心 | Ultrasonic-based sludge concentration monitoring system |
| CN104749077A (en) * | 2015-03-31 | 2015-07-01 | 无锡市崇安区科技创业服务中心 | Suspension particle concentration detection system based on ultrasonic waves |
| CN105738469A (en) * | 2016-04-13 | 2016-07-06 | 华南理工大学 | Liquid suspended matter concentration measuring method and device based on ultrasonic power spectrum estimation |
| CN105738469B (en) * | 2016-04-13 | 2019-01-29 | 华南理工大学 | Liquid suspension concentration measuring method and device based on ultrasonic power Power estimation |
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