CN112050906A - Device and method for detecting fire-fighting agent amount based on time domain and V-shaped coupling - Google Patents
Device and method for detecting fire-fighting agent amount based on time domain and V-shaped coupling Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2961—Acoustic waves for discrete levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
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Abstract
The invention discloses a device and a method for detecting the dosage of fire fighting agents based on time domain and V-shaped coupling, and the device and the method comprise a portable host, a cable connecting line and a V-shaped coupling surface double-ultrasonic probe array, wherein the portable host comprises an LCD control display module, a singlechip processor module, a key module, an oscillation power amplification module, an echo shaping module, a power supply module and a signal amplification processing module; the V-shaped coupling surface double ultrasonic probe array comprises a special-shaped base, a special-shaped cover plate pressing block, an ultrasonic transmitting probe, an ultrasonic receiving probe and an elastic piece. The detection device of this scheme conveniently carries, compares measurement, low-power consumption, operation directly perceived simple and convenient automatically, can carry out professional pertinence ground to the reserves of medicament in the fire-fighting medicament steel bottle and detect, has improved the precision that detects simultaneously.
Description
Technical Field
The invention relates to the technical field of fire-fighting agent reserve detection, in particular to a device and a method for detecting the amount of fire-fighting agents based on time domain and V-shaped coupling.
Background
With the increasing awareness of social security and disaster reduction, a large number of high-capacity fire-fighting agent steel cylinders are equipped in some key fields, particularly in marine land petroleum and natural gas, ships, power generation, data centers of banks and finance, airports and the like.
In order to detect the storage allowance of the fire-fighting medicament in the steel cylinder, the steel cylinder of the fire-fighting medicament needs to be detached from the fixing frame and then put on a platform scale for weighing during the prior operation. For example, typically a marine vessel will be equipped with 200 and 600 cylinders of 45kg weight of fire-fighting agent, which means that a minimum of 200 disassembly and assembly operations are required before each departure, wasting a lot of physical effort and time.
Although the piezoelectric ultrasonic liquid level detector with a single probe is used at present in China, the piezoelectric ultrasonic liquid level detector is not suitable for detecting the reserve volume of a professional fire-fighting medicament in a specific field of fire-fighting medicament steel cylinders. Compared with production or storage tank containers in the industries of chemical industry, pharmacy, food and the like, the steel cylinder for the fire-fighting agent has the remarkable characteristics that: the diameter is very small, and the detected point on the surface of the fire-fighting agent steel cylinder is higher than that of a large storage tank in the chemical industry and other industries, so that uncertainty is brought to planar piezoelectric single-probe ultrasonic measurement.
The main difficulty in implementing piezoelectric air-coupled transducers is the severe impedance mismatch between the piezoelectric material and air, as the characteristic impedance of a typical PZT material can be greater than 30 mrayl, while air is only around 425 Rayl. (quoted from the institute of acoustics of academy of sciences, journal of acoustic application, 2018, first phase 37, page 100-104.) because the detected point on the surface of the steel cylinder of fire-fighting agent has high elevation, it means: the planar piezoelectric ultrasonic single probe cannot be completely coupled with the surface of the fire-fighting agent steel cylinder to be measured (air exists in the middle), and the transmission of ultrasonic waves can be influenced by the incomplete coupling, so that the measurement result is influenced.
At present, in order to avoid the difficulty of steel cylinder weight disassembly and assembly, a SONIC 100 planar piezoelectric single-probe ultrasonic liquid level detector imported by EUSEBI IMPIANTI company is used in most occasions in China. The instrument has a nominal accuracy of 5% FS, adopts a 12VDC built-in rechargeable lithium battery as a power supply, and comprises the following use steps:
1. placing and fixing the SONIC 100 host in a proper platform surface area;
2. smearing a couplant on a detected point on a fire-fighting agent steel cylinder;
3. pressing a planar piezoelectric ultrasonic probe on the coupling agent;
4. the switch is turned on by rotation, and a certain use experience is needed to correctly select a switch gear;
5. the eyes observe the pointer voltmeter, and simultaneously rotate the Gain adjusting knob, so that certain operation experience is required to correctly operate and measure;
6. and (3) manual observation and judgment: if the pointer deflects to the red area of the pointer voltmeter, the detection point is represented as no medicament; if the pointer deflects to a black area of the pointer voltmeter, the medicine is present at the detection point; if the pointer jumps back and forth between the black and red areas of the pointer voltmeter, an operator is required to perform manual fine adjustment on the Gain knob;
7. and after the detection is finished, wiping the coupling agent at the detection point by using a rag to clean the steel cylinder.
During measurement, after a measurement gear switch is selected by rotating the SONIC 100 ultrasonic liquid level detector of EUSEBI IMPIANTI company, the detector is always in a transmitting and receiving measurement state. By means of the uninterrupted measuring state, the pointer of the pointer voltmeter deflects continuously, and whether the liquid fire-fighting agent exists at the detected point or not is judged by observing the voltage indicated by the pointer by an operator. Although the SONIC 100 ultrasonic liquid level detector of EUSEBI impantani company avoids repeatedly disassembling and assembling fire-fighting medicament steel cylinders for weighing, the measuring method and the detecting device have certain disadvantages, such as:
after the device is opened, the device is always in a high-voltage transmitting and echo receiving measuring state, so that the power consumption of the device is high, a 12VDC built-in rechargeable lithium battery with large capacity and high voltage is needed as a power supply, a product host is large in size and cannot be held by hands, the weight is heavy, and the product host needs to be independently placed (time delay and a proper placing platform needs to be found); a couplant is required to be smeared before measurement, and cleaning is required after measurement; meanwhile, the detection device of the measurement method has certain technical experience requirements on operators, and the operators are required to continuously observe the pointer of the pointer voltmeter to adjust the Gain knob during measurement, so that errors in artificial observation and operation easily occur; in addition, the SONIC 100 of EUSEBI impaianti company uses a 12VDC built-in rechargeable lithium battery as a power source, and has a limitation of air transportation during transportation of the trade to users.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a device and a method for detecting the quantity of fire fighting agents based on time domain and V-shaped coupling.
In order to achieve the purpose, the invention adopts the following technical scheme:
the device for detecting the amount of the fire-fighting agent based on time domain and V-shaped coupling comprises a portable host, a cable connecting line and a V-shaped coupling surface double ultrasonic probe array, wherein the portable host comprises an LCD control display module, a single chip microcomputer processor module, a key module, an oscillation power amplification module, an echo shaping module, a power supply module and a signal amplification processing module;
the single-chip microcomputer processor module comprises a program which is used for calibrating, correcting and storing ultrasonic echo time and echo intensity and can be used for setting a time domain; automatically calculating and comparing ultrasonic measurement parameters of the fire-fighting agent based on the set time domain, and sending a measurement result;
the V-shaped coupling surface double ultrasonic probe array comprises a special-shaped base, a special-shaped cover plate pressing block, an ultrasonic transmitting probe, an ultrasonic receiving probe and an elastic piece;
the V-shaped coupling surface double-ultrasonic probe array consists of an ultrasonic transmitting probe consisting of 1 ultrasonic transmitting transducer, an ultrasonic receiving probe consisting of 1 ultrasonic receiving transducer, a special-shaped base, a special-shaped cover plate pressing block and two elastic pieces, wherein the special-shaped base and the special-shaped cover plate pressing block provide fixing and supporting with specific shapes and sizes for the 1 ultrasonic transmitting probe and the 1 ultrasonic receiving probe, and the two elastic pieces respectively provide a telescopic function, fixing and supporting for the ultrasonic transmitting probe and the ultrasonic receiving probe;
the cable connecting line provides connection for the portable host and the V-shaped coupling surface double-ultrasonic probe array.
Furthermore, the LCD control display module is controlled by the singlechip processor module to provide the display of a use interface for a user, and simultaneously receives the operation result of the singlechip processor module after measurement and informs the result value to the user through the display of characters and words;
the key module is used for transmitting and inputting the instruction of the user to the single chip microcomputer processor module;
the singlechip processor module calls measurement parameters meeting the user requirements according to the instructions transmitted by the key module and generates corresponding measurement square wave signals;
after receiving the signal, the oscillation power amplification module oscillates and amplifies the power to generate high-voltage pulses with the same frequency and quantity;
the high-voltage pulse is transmitted to an ultrasonic emission probe of the V-shaped coupling surface double ultrasonic probe array through a cable connecting wire;
the ultrasonic transmitting probe converts high-voltage electric pulse energy into mechanical energy ultrasonic waves with the same frequency and quantity, and transmits the mechanical energy ultrasonic waves to a fire-fighting agent steel cylinder;
the ultrasonic receiving probe of the V-shaped coupling surface double ultrasonic probe array converts mechanical energy ultrasonic waves reflected by the metal wall behind the fire-fighting agent steel cylinder into weak low-voltage electric pulse signals with the same frequency and quantity;
the low-voltage electric pulse signals are transmitted to the echo shaping module through a cable connecting line, then enter the signal amplification processing module for processing and conversion, then are input to the single-chip processor module, and after comparison and calculation, calculation results are sent to the LCD control display module.
Furthermore, the elastic parts respectively provide the extension function and the fixation and the support within the range of 1-50mm for the ultrasonic transmitting probe and the ultrasonic receiving probe.
Furthermore, two coaxial cables with the outer diameter of 2-20mm or one cable consisting of 1-2 small coaxial cables with the outer diameter of 1-10mm are used in the cable connecting line.
Furthermore, the portable main machine also comprises a battery compartment switch and a detachable hatch cover which can be locked and unlocked quickly, and a rechargeable battery which can be detached, detached and replaced quickly is assembled in the battery compartment.
Further, the single-chip microcomputer processor module can select and set the comparison time domain [ tx, ty ] of the ultrasonic echo time.
The method for detecting the amount of the fire fighting agent based on the time domain and the V-shaped coupling is characterized by comprising the following steps:
s1, attaching a V-shaped coupling surface double-ultrasonic probe array to a detected point of a fire-fighting agent steel cylinder;
s2, a single-chip microcomputer processor module in the portable host generates a group of measured square wave signals;
s3, the square wave signals are processed by an oscillation power amplification module to form the high-voltage pulse electric waves with the same frequency and quantity;
s4, the high-voltage pulse electric waves reach an ultrasonic emission probe of the V-shaped coupling surface double ultrasonic probe array through a cable connecting line, the pulse electric wave energy is converted into mechanical energy ultrasonic waves with the same frequency and quantity through the ultrasonic emission probe, timing is started simultaneously, and the time t1 for ultrasonic emission is recorded;
s5, the ultrasonic waves are directly incident to the front metal wall of the fire-fighting agent steel cylinder through the matching layer of the metal on the ultrasonic transmitting probe and penetrate through the front metal wall to be incident to the fire-fighting agent or gas above the fire-fighting agent;
s6, the ultrasonic waves form reflection echoes with the same frequency and quantity on the metal wall on the back side of the incident side of the fire-fighting agent steel cylinder;
s7, the reflected echo returns to and penetrates through the metal wall of the fire-fighting agent steel cylinder on the original emission side through the fire-fighting agent or the gas above the fire-fighting agent again;
s8, the reflected echoes are received and identified by ultrasonic receiving probes in the V-shaped coupling surface double ultrasonic probe array, the ultrasonic receiving probes in the V-shaped coupling surface double ultrasonic probe array convert the mechanical energy ultrasonic waves into electric wave signals with the same frequency and quantity, and the time t2 at the moment is recorded;
s9, the electric wave signals are transmitted into an echo shaping module through a cable connecting line to carry out echo shaping;
s10, the shaped signal is processed by a signal amplification processing module, the signal amplification processing module can automatically amplify the signal according to the gain set in a program, and Vpp2 obtained by performing multiple conversion on the amplified signal is measured;
s11, the values t1, t2 and Vpp2 recorded by measurement are sent to a singlechip processor module, and the singlechip processor module operates a comparison program:
because the propagation frequency of the ultrasonic wave in different media is constant, but the propagation speed is different, and the energy absorption of the ultrasonic wave by different media is different;
let v0 be the propagation velocity of the ultrasonic wave in the metal wall of the fire-fighting agent steel cylinder;
let v1 be the propagation velocity of the ultrasonic wave in the fire-fighting agent;
let v2 be the propagation velocity of the ultrasonic wave in the gas above the fire-fighting agent steel cylinder;
setting the thickness of the metal wall of the fire-fighting agent steel cylinder as L0 and the diameter of the fire-fighting agent steel cylinder as D0;
according to the formula: distance, speed, time, S, v, t;
the time taken for the ultrasonic wave to travel from transmission to reception is divided into two cases:
the time for the ultrasonic wave to propagate through the fire-fighting agent is t 3;
t3 is 2L0/v0+2D0/v1 formula (i);
the time for the ultrasonic wave to propagate through the gas above the fire-fighting agent is t 4;
t4 ═ 2L0/v0+2D0/v2 formula (c);
after calibration correction and temperature compensation, calculation parameters in the formula are all constants;
since v1 ≠ v2, compare equation (r) with equation (ii): t3 ≠ t 4;
t3 is time domain set, [ t 3-specific value, t3+ specific value ], this interval being named interval x 1;
t4 is time domain set, [ t 4-specific value, t4+ specific value ], this interval being named interval x 2;
the time taken for the ultrasonic wave to actually propagate is measured as t 5: t 5-t 2-t 1;
comparing whether t5 falls into the interval x1 formula (c);
comparing whether t5 falls into the interval x2 formula (iv);
setting the peak value of the echo of the calibration correction in the fire-fighting agent time domain x1 as Vpp 3;
setting the peak value of an echo peak of calibration correction in a gas time domain x2 above the fire fighting agent as Vpp 4;
different media absorb ultrasonic energy differently, so Vpp3 ≠ Vpp 4;
interval confidence is applied to Vpp3, [ Vpp 3-specific value, Vpp3+ specific value ], designated interval x 3;
interval confidence is applied to Vpp4, [ Vpp 4-specific value, Vpp4+ specific value ], designated interval x 4;
comparing whether Vpp2 falls into the interval x3 formula (v);
comparing whether the Vpp2 falls into the interval x4 formula (sixth);
and (3) judging: formula (c) and formula (c);
and (3) judging: the formula (iv) < CHEM >;
s12, sending the calculation results of the formula (c) and the formula (b) to an LCD control display module;
if the result is true, entering S13.1; if the result of the formula (xi) is true, the process goes to S13.2;
s13.1, displaying a result by an LCD screen, and informing a user of: judging that the detection point is provided with liquid fire-fighting agent;
s13.2, displaying a result by an LCD screen, and informing a user of: judging that the detection point is free of liquid fire-fighting agent;
s14, finishing single measurement work;
s15, the user repeats the detection steps of S1-S14, and the V-shaped coupling surface double-ultrasonic probe array is gradually detected from the position at 95% of the full medicament position on the fire-fighting medicament steel cylinder to the position at 85% of the full medicament position on the fire-fighting medicament steel cylinder in an approaching manner, so that the liquid level position of the medicament in the fire-fighting medicament steel cylinder can be accurately identified;
and S16, finishing detection.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a device and a method for detecting the amount of fire fighting agent based on time domain and V-shaped coupling.A program of a single chip microcomputer processor module is used for calibrating, correcting and storing ultrasonic echo time and echo intensity, and setting a time domain; the ultrasonic measurement parameters of the fire-fighting medicament are automatically calculated and compared based on the set time domain to obtain a measurement result, so that automatic judgment and detection are realized, the operation is simplified, and errors caused by manual operation and observation are avoided;
2. compared with the prior art, the device and the method for detecting the fire-fighting agent amount based on time domain and V-shaped coupling have stronger specialty and pertinence, and the matching degree of the ultrasonic transmitting probe and the ultrasonic receiving probe is higher when the ultrasonic transmitting probe and the ultrasonic receiving probe are contacted with a fire-fighting agent steel cylinder without smearing a coupling agent due to the design of the V-shaped coupling surface double ultrasonic probe array;
3. compared with the existing continuous measurement manual observation and judgment method, the method has low power consumption, and can automatically compare the data with the stored data for calibration and correction, so that the working mode of discontinuous measurement can be realized, continuous emission of high-voltage pulses is avoided, and low power consumption is realized;
4. the portable handheld detection instrument is light and portable, is convenient to operate, and can adopt a battery with smaller capacity (such as 4200mAh) and lower voltage (such as 3.7VDC) in design due to low power consumption, so that the portable handheld detection instrument is manufactured, and a placement platform for a host computer provided with a heavy battery is avoided; the LCD screen on the host clearly provides the user with the measurement menu selection, and can automatically detect and compare based on the time domain, the result is visually displayed through words, and the measurement operation is simple and convenient;
5. the design of the V-shaped coupling surface double ultrasonic probe array enables the sizes of the ultrasonic transmitting probe and the ultrasonic receiving probe to be controlled within 15mm, thereby ensuring that the measurement error of the device can be controlled within +/-7.5 mm. Compared with the precision of 5% FS of products in the same industry, the precision of the device is remarkably improved;
in conclusion, the detection device has strong professional pertinence, can avoid artificial errors through intelligent automatic judgment, is portable, simple and convenient, has low power consumption, can replace imported products to intelligently and automatically detect the storage amount of the medicament in the fire-fighting medicament steel cylinder, and simultaneously improves the detection precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the overall structure of the device for detecting the amount of fire-fighting agent based on time domain and V-shaped coupling and the agent cylinder according to the present invention;
FIG. 2 is a schematic view of a V-shaped coupling surface dual ultrasonic probe array in contact with a medicament steel cylinder;
FIG. 3 is an enlarged schematic view of the structure of the V-shaped coupling surface dual ultrasonic probe array of the present invention;
FIG. 4 is a schematic block diagram of an apparatus for detecting the amount of a fire fighting agent based on time domain and V-coupling according to the present invention;
fig. 5 is a schematic flow chart of the method for detecting the amount of the fire fighting agent based on time domain and V-shaped coupling according to the present invention.
In the figure: the device comprises a portable host computer 1, a 101LCD control display module, a 102 single-chip microcomputer processor module, a 103 key module, a 104 oscillation power amplification module, a 105 echo shaping module, a 106 power supply module, a 107 signal amplification processing module, a 2 cable connecting line, a 3V-shaped coupling surface double ultrasonic probe array, a 301 special-shaped base, a 302 special-shaped cover plate pressing block, a 303 ultrasonic transmitting probe, a 304 ultrasonic receiving probe and a 305 elastic element.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-4, the device for detecting the amount of fire fighting agent based on time domain and V-shaped coupling comprises a portable host 1, a cable connecting wire 2 and a V-shaped coupling surface double ultrasonic probe array 3, wherein the portable host 1 comprises an LCD control display module 101, a single chip microcomputer processor module 102, a key module 103, an oscillation power amplification module 104, an echo shaping module 105, a power supply module 106 and a signal amplification processing module 107;
the V-shaped coupling surface double ultrasonic probe array 3 comprises a special-shaped base 301, a special-shaped cover plate pressing block 302, an ultrasonic transmitting probe 303, an ultrasonic receiving probe 304 and an elastic piece 305;
the V-shaped coupling surface double-ultrasonic probe array 3 consists of an ultrasonic transmitting probe 303 consisting of 1 ultrasonic transmitting transducer, an ultrasonic receiving probe 304 consisting of 1 ultrasonic receiving transducer, a special-shaped base 301, a special-shaped cover plate pressing block 302 and two elastic pieces 305, wherein the special-shaped base 301 and the special-shaped cover plate pressing block 302 provide fixing and supporting of specific shapes and sizes for the 1 ultrasonic transmitting probe 303 and the 1 ultrasonic receiving probe 304, and the two elastic pieces 305 respectively provide telescopic functions, fixing and supporting for the ultrasonic transmitting probe 303 and the ultrasonic receiving probe 304;
the cable connecting wire 2 provides connection for the portable host 1 and the V-shaped coupling surface double-ultrasonic probe array 3.
The LCD control display module 101 is controlled by the singlechip processor module 102 to provide the display of a use interface for a user, and simultaneously receives the operation result of the singlechip processor module 102 after measurement and informs the result value to the user through the display of characters and words;
the key module 103 is used for transmitting and inputting the instruction of the user to the singlechip processor module 102;
the singlechip processor module 102 calls measurement parameters meeting the requirements of users according to the instructions transmitted by the key module 103 and generates corresponding measurement square wave signals;
after receiving the upper signal, the oscillation power amplification module 104 oscillates and amplifies the power to generate high-voltage pulses with the same frequency and quantity;
the high-voltage pulse is transmitted to an ultrasonic emission probe 303 of the V-shaped coupling surface double ultrasonic probe array 3 through a cable connecting wire 2;
the ultrasonic transmitting probe 303 converts the high-voltage electric pulse energy into mechanical energy ultrasonic waves with the same frequency and quantity, and transmits the mechanical energy ultrasonic waves to a fire-fighting agent steel cylinder;
the ultrasonic receiving probe 304 of the V-shaped coupling surface double ultrasonic probe array 3 converts the mechanical energy ultrasonic waves reflected by the metal wall behind the fire-fighting agent steel cylinder into weak low-voltage electric pulse signals with the same frequency and quantity;
the low-voltage electric pulse signals are transmitted to the echo shaping module 105 through the cable connecting wire 2, then enter the signal amplification processing module 107 for processing and conversion, then the processed signals are input to the single chip processor module 102, and after comparison and calculation, the calculation results are sent to the LCD control display module 101.
The elastic member 305 provides a telescopic function and fixing and supporting of the ultrasonic transmission probe 303 and the ultrasonic reception probe 304 within a range of 1-50mm, respectively.
Two coaxial cables with the outer diameter of 2-20mm or one cable consisting of 1-2 small coaxial cables with the outer diameter of 1-10mm are used in the cable connecting line 2.
The portable main machine 1 also comprises a battery compartment switch and a detachable compartment cover which can be locked and unlocked quickly, and a rechargeable battery which can be detached, detached and replaced quickly is assembled in the battery compartment.
The SCM processor module 102 can select and set the comparison time domain [ tx, ty ] of the ultrasonic echo time.
Referring to fig. 5, a method for detecting the amount of a fire fighting agent based on time domain and V-coupling, the method comprising the steps of:
s1, turning on a power switch of the detection device, and attaching a V-shaped coupling surface double-ultrasonic probe array 3 to a detected point of a fire-fighting agent steel cylinder;
s2, a singlechip processor module 102 in the portable host 1 generates a group of (2-30 adjustable, usually 8) square wave signals with the center frequency of 165kHz (+ -90 kHz);
s3, after the square wave signals are processed by the oscillation power amplification module 104, high-voltage pulse electric waves with the same frequency and quantity of Vpp1 (emission peak value) of 1100V (+ -700V) are formed;
s4, the high-voltage pulse electric waves reach an ultrasonic emission probe 303 of the V-shaped coupling surface double-ultrasonic probe 3 through the cable connecting wire 2, the pulse electric wave energy is converted into mechanical energy ultrasonic waves with the same frequency and quantity through the ultrasonic emission probe 303, timing is started simultaneously, and the time t1 for ultrasonic emission is recorded;
s5, the ultrasonic waves are directly incident to the front metal wall of the fire-fighting agent steel cylinder through the matching layer of the metal on the ultrasonic transmitting probe 303 and penetrate through the front metal wall to be incident to the fire-fighting agent or gas above the fire-fighting agent;
s6, the ultrasonic waves form reflection echoes with the same frequency and quantity on the metal wall on the back side of the incident side of the fire-fighting agent steel cylinder;
s7, the reflected echo returns to and penetrates through the metal wall of the fire-fighting agent steel cylinder on the original emission side through the fire-fighting agent or the gas above the fire-fighting agent again;
s8, the reflected echoes are received and identified by the ultrasonic receiving probes 304 in the V-shaped coupling surface double ultrasonic probe array 3 (with the same frequency and quantity), the ultrasonic receiving probes 304 in the V-shaped coupling surface double ultrasonic probe array 3 convert the mechanical energy ultrasonic waves into electric wave signals with the same frequency and quantity, and the time t2 at the moment is recorded;
s9, the electric wave signals are transmitted into an echo shaping module 105 through a cable connecting wire 2 to be shaped;
s10, the shaped signal is processed by a signal amplification processing module 107, the signal amplification processing module 107 automatically amplifies the signal according to a gain set in a program, and Vpp2 (echo peak value) obtained by performing multiple conversion on the amplified signal is measured;
s11, the values t1, t2 and Vpp2 recorded by measurement are sent to the singlechip processor module 102, and the singlechip processor module 102 operates a comparison program:
because the propagation frequency of the ultrasonic wave in different media is constant, but the propagation speed is different, and the energy absorption of the ultrasonic wave by different media is different;
let v0 be the propagation velocity of the ultrasonic waves in the metal wall of the fire-fighting agent cylinder,
let v1 be the propagation velocity of the ultrasonic waves in the fire-fighting agent (different agents have their corresponding propagation velocities),
let v2 be the propagation velocity of the ultrasonic waves in the gas above the fire-fighting agent cylinder (different gases above the agent have corresponding propagation velocities),
the thickness of the metal wall of the fire-fighting agent steel cylinder is L0, the diameter of the fire-fighting agent steel cylinder is D0,
according to the formula: distance, speed, time, S v t,
the time taken for the ultrasonic wave to travel from transmission to reception is divided into two cases (the time for the electric signal to travel is ignored):
the time for the ultrasonic wave to propagate through the fire-fighting agent is t3,
t3 is 2L0/v0+2D0/v1 formula (i);
the time for the ultrasonic wave to propagate through the gas above the fire-fighting agent is t4,
t4 ═ 2L0/v0+2D0/v2 formula (c);
after calibration correction and temperature compensation, calculation parameters in the formula are all constants;
since v1 ≠ v2, compare equation (r) with equation (ii): t3 ≠ t 4;
t3 is time domain set, [ t 3-specific value, t3+ specific value ], this interval being named interval x 1;
t4 is time domain set, [ t 4-specific value, t4+ specific value ], this interval being named interval x 2;
the time taken for the ultrasonic wave to actually propagate is measured as t 5: t 5-t 2-t 1;
comparing whether t5 falls into the interval x1 formula (c);
comparing whether t5 falls into the interval x2 formula (iv);
setting the echo peak value of calibration correction in a fire-fighting agent time domain x1 as Vpp3 (the echo peak values of fire-fighting agent steel cylinders with different diameters are different, and after calibration correction, each diameter and each fire-fighting agent have the corresponding echo peak value to be stored for comparison);
setting the echo peak value of calibration correction in a gas time domain x2 above the fire fighting agent as Vpp4 (the echo peak values of fire fighting agent steel cylinders with different diameters are different, and after calibration correction, the corresponding echo peak value of each diameter and each type of fire fighting agent is stored for comparison);
different media absorb ultrasonic energy differently, so Vpp3 ≠ Vpp 4;
interval confidence is applied to Vpp3, [ Vpp 3-specific value, Vpp3+ specific value ], designated interval x 3;
interval confidence is applied to Vpp4, [ Vpp 4-specific value, Vpp4+ specific value ], designated interval x 4;
comparing whether Vpp2 falls into the interval x3 formula (v);
comparing whether the Vpp2 falls into the interval x4 formula (sixth);
and (3) judging: formula (c) and formula (c);
and (3) judging: the formula (iv) < CHEM >;
s12, sending the calculation results of the formula (c) and the formula (b) to an LCD control display module;
if the result is true, entering S13.1; if the result of the formula (xi) is true, the process goes to S13.2;
s13.1, displaying a result by an LCD screen, and informing a user of: judging that the detection point is provided with liquid fire-fighting agent;
s13.2, displaying a result by an LCD screen, and informing a user of: judging that the detection point is free of liquid fire-fighting agent;
s14, finishing single measurement work;
s15, the user repeats the detection steps of S1-S14, and the V-shaped coupling surface double-ultrasonic probe array 3 is gradually detected in an approaching mode from the position of 95% of the full medicament position on the fire-fighting medicament steel cylinder to the position of 85% of the full medicament position on the fire-fighting medicament steel cylinder, so that the liquid level position of the medicament in the fire-fighting medicament steel cylinder can be accurately identified;
s16, finishing detection;
when the liquid level of the fire-fighting medicament is lower than 90% of the full medicament level, the steel cylinder of the fire-fighting medicament and the fire-fighting medicament need to be replaced;
and when the liquid level position of the fire-fighting agent is more than or equal to 90% of the full agent level, the storage amount of the fire-fighting agent in the fire-fighting agent steel cylinder is qualified.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The device for detecting the amount of the fire fighting agent based on time domain and V-shaped coupling comprises a portable host (1), a cable connecting wire (2) and a V-shaped coupling surface double ultrasonic probe array (3), and is characterized in that;
the portable host (1) comprises an LCD control display module (101), a singlechip processor module (102), a key module (103), an oscillation power amplification module (104), an echo shaping module (105), a power supply module (106) and a signal amplification processing module (107);
the V-shaped coupling surface double-ultrasonic-wave probe array (3) comprises a special-shaped base (301), a special-shaped cover plate pressing block (302), an ultrasonic transmitting probe (303), an ultrasonic receiving probe (304) and an elastic piece (305);
the V-shaped coupling surface double-ultrasonic probe array (3) consists of an ultrasonic transmitting probe (303) consisting of 1 ultrasonic transmitting transducer, an ultrasonic receiving probe (304) consisting of 1 ultrasonic receiving transducer, a special-shaped base (301), a special-shaped cover plate pressing block (302) and two elastic pieces (305), wherein the special-shaped base (301) and the special-shaped cover plate pressing block (302) provide fixing and supporting for the 1 ultrasonic transmitting probe (303) and the 1 ultrasonic receiving probe (304), and the two elastic pieces (305) respectively provide a telescopic function, fixing and supporting for the ultrasonic transmitting probe (303) and the ultrasonic receiving probe (304);
the cable connecting line (2) is used for connecting the portable host (1) with the V-shaped coupling surface double ultrasonic probe array (3).
2. The device for detecting the amount of the fire fighting agent based on the time domain and the V-shaped coupling according to claim 1, wherein the LCD control display module (101) is controlled by the singlechip processor module (102) to provide a user interface for display, and simultaneously receives an operation result of the singlechip processor module (102) after measurement and informs the user of the result value through text and word display;
the key module (103) is used for transmitting and inputting the instruction of the user to the single-chip microcomputer processor module (102);
the singlechip processor module (102) calls measurement parameters meeting the requirements of users according to the instructions transmitted by the key module (103) and generates corresponding measurement square wave signals;
after receiving the signals, the oscillation power amplification module (104) oscillates and amplifies the power to generate high-voltage pulses with the same frequency and quantity;
the high-voltage pulse is transmitted to an ultrasonic emission probe (303) of the V-shaped coupling surface double ultrasonic probe array (3) through a cable connecting wire (2);
the ultrasonic transmitting probe (303) converts the high-voltage electric pulse energy into mechanical energy ultrasonic waves with the same frequency and quantity, and transmits the mechanical energy ultrasonic waves to a fire-fighting agent steel cylinder;
the ultrasonic receiving probe (304) of the V-shaped coupling surface double ultrasonic probe array (3) converts the mechanical energy ultrasonic waves reflected by the rear metal wall of the fire-fighting agent steel cylinder into weak low-voltage electric pulse signals with the same frequency and quantity;
the low-voltage electric pulse signals are transmitted to an echo shaping module (105) through a cable connecting wire (2), then enter a signal amplification processing module (107) for processing and conversion, then the processed signals are input to a single chip microcomputer processor module (102), and after comparison and calculation, calculation results are sent to an LCD control display module (101).
3. The device for detecting the amount of fire fighting agent based on time domain and V-shaped coupling according to claim 1, wherein the elastic member (305) provides the ultrasonic transmission probe (303) and the ultrasonic reception probe (304) with a telescopic function and a fixing and supporting function within a range of 1-50mm, respectively.
4. The device for detecting the amount of fire fighting agent based on time domain and V-shaped coupling according to claim 1, wherein the one-chip microcomputer processor module (102) can select and set the ultrasonic echo time to be compared with the time domain [ tx, ty ].
5. The method for detecting the amount of the fire fighting agent based on the time domain and the V-shaped coupling is characterized by comprising the following steps:
s1, attaching a V-shaped coupling surface double ultrasonic probe array (3) to a detected point of a fire-fighting agent steel cylinder;
s2, a singlechip processor module (102) in the portable host (1) generates a group of measured square wave signals;
s3, the square wave signals are processed by an oscillation power amplification module (104) to form the high-voltage pulse electric waves with the same frequency and quantity;
s4, the high-voltage pulse electric waves reach an ultrasonic emission probe (303) of the V-shaped coupling surface double-ultrasonic-wave probe array (3) through a cable connecting line, the pulse electric wave energy is converted into mechanical energy ultrasonic waves with the same frequency and quantity through the ultrasonic emission probe (303), timing is started at the same time, and the time t1 of ultrasonic emission is recorded;
s5, the ultrasonic waves are directly incident to the front metal wall of the fire-fighting agent steel cylinder through the matching layer of the metal on the ultrasonic transmitting probe (303) and penetrate through the front metal wall to be incident to the fire-fighting agent or gas above the fire-fighting agent;
s6, the ultrasonic waves form reflection echoes with the same frequency and quantity on the metal wall on the back side of the incident side of the fire-fighting agent steel cylinder;
s7, the reflected echo returns to and penetrates through the metal wall of the fire-fighting agent steel cylinder on the original emission side through the fire-fighting agent or the gas above the fire-fighting agent again;
s8, the reflected echo is received and identified by an ultrasonic receiving probe (304) in the V-shaped coupling surface double ultrasonic probe array (3), the ultrasonic receiving probe (304) in the V-shaped coupling surface double ultrasonic probe array (3) converts the mechanical energy ultrasonic waves into electric wave signals with the same frequency and quantity, and the time t2 at the moment is recorded at the same time;
s9, the electric wave signals are transmitted into an echo shaping module (105) through a cable connecting wire (2) to carry out echo shaping;
s10, the shaped signal is processed by a signal amplification processing module (107), the signal amplification processing module (107) can automatically amplify the signal according to a gain set in a program, and Vpp2 obtained by performing multiple conversion on the amplified signal is measured;
s11, the values t1, t2 and Vpp2 recorded by measurement are sent to a singlechip processor module (102), and the singlechip processor module (102) operates a comparison program:
because the propagation frequency of the ultrasonic wave in different media is constant, but the propagation speed is different, and the energy absorption of the ultrasonic wave by different media is different;
let v0 be the propagation velocity of the ultrasonic wave in the metal wall of the fire-fighting agent steel cylinder;
let v1 be the propagation velocity of the ultrasonic wave in the fire-fighting agent;
let v2 be the propagation velocity of the ultrasonic wave in the gas above the fire-fighting agent steel cylinder;
setting the thickness of the metal wall of the fire-fighting agent steel cylinder as L0 and the diameter of the fire-fighting agent steel cylinder as D0;
according to the formula: distance, speed, time, S, v, t;
the time taken for the ultrasonic wave to travel from transmission to reception is divided into two cases:
the time for the ultrasonic wave to propagate through the fire-fighting agent is t 3;
t3 is 2L0/v0+2D0/v1 formula (i);
the time for the ultrasonic wave to propagate through the gas above the fire-fighting agent is t 4;
t4 ═ 2L0/v0+2D0/v2 formula (c);
after calibration correction and temperature compensation, calculation parameters in the formula are all constants;
since v1 ≠ v2, compare equation (r) with equation (ii): t3 ≠ t 4;
t3 is time domain set, [ t 3-specific value, t3+ specific value ], this interval being named interval x 1;
t4 is time domain set, [ t 4-specific value, t4+ specific value ], this interval being named interval x 2;
the time taken for the ultrasonic wave to actually propagate is measured as t 5: t 5-t 2-t 1;
comparing whether t5 falls into the interval x1 formula (c);
comparing whether t5 falls into the interval x2 formula (iv);
setting the peak value of the echo of the calibration correction in the fire-fighting agent time domain x1 as Vpp 3;
setting the peak value of an echo peak of calibration correction in a gas time domain x2 above the fire fighting agent as Vpp 4;
different media absorb ultrasonic energy differently, so Vpp3 ≠ Vpp 4;
interval confidence is applied to Vpp3, [ Vpp 3-specific value, Vpp3+ specific value ], designated interval x 3;
interval confidence is applied to Vpp4, [ Vpp 4-specific value, Vpp4+ specific value ], designated interval x 4;
comparing whether Vpp2 falls into the interval x3 formula (v);
comparing whether the Vpp2 falls into the interval x4 formula (sixth);
and (3) judging: formula (c) and formula (c);
and (3) judging: the formula (iv) < CHEM >;
s12, sending the calculation results of the formula (c) and the formula (b) to an LCD control display module;
if the result is true, entering S13.1; if the result of the formula (xi) is true, the process goes to S13.2;
s13.1, displaying a result by an LCD screen, and informing a user of: judging that the detection point is provided with liquid fire-fighting agent;
s13.2, displaying a result by an LCD screen, and informing a user of: judging that the detection point is free of liquid fire-fighting agent;
s14, finishing single measurement work;
s15, the user repeats the detection steps of S1-S14, and the V-shaped coupling surface double-ultrasonic probe array (3) is gradually detected in an approaching mode from the position of 95% of the full medicament position on the fire-fighting medicament steel cylinder to the position of 85% of the full medicament position on the fire-fighting medicament steel cylinder, so that the liquid level position of the medicament in the fire-fighting medicament steel cylinder can be accurately identified;
and S16, finishing detection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075666A (en) * | 2021-03-26 | 2021-07-06 | 哈尔滨理工大学 | Portable ultrasonic imaging system and method |
| KR102418828B1 (en) * | 2021-12-08 | 2022-07-11 | (주)리모트글로벌 | Residual Chemical Detection Device Using Ultrasound |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075666A (en) * | 2021-03-26 | 2021-07-06 | 哈尔滨理工大学 | Portable ultrasonic imaging system and method |
| KR102418828B1 (en) * | 2021-12-08 | 2022-07-11 | (주)리모트글로벌 | Residual Chemical Detection Device Using Ultrasound |
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