CN104535136A - Material level measuring method and system - Google Patents
Material level measuring method and system Download PDFInfo
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- CN104535136A CN104535136A CN201410857624.5A CN201410857624A CN104535136A CN 104535136 A CN104535136 A CN 104535136A CN 201410857624 A CN201410857624 A CN 201410857624A CN 104535136 A CN104535136 A CN 104535136A
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Abstract
The invention discloses a material level measuring method and system. The method comprises the steps that the intervals between the sending time and the receiving time of four ultrasonic wave signals which are sent to a to-be-measured object are measured, and the transmission time of each ultrasonic wave signal is generated; the transmission time of each ultrasonic wave signal is multiplied by the transmission velocity of each ultrasonic wave signal respectively, and the transmission distance of each ultrasonic wave signal is generated; if the four transmission distances are all larger than preset blind area distance, the average value of the transmission distance of the first ultrasonic wave signal and the transmission distance of the third ultrasonic wave signal is obtained, and average distance is generated; whether the transmission distance of the second ultrasonic wave signal, the transmission distance of the fourth ultrasonic wave signal and the average distance mutually satisfies a preset approximately equal condition is judged, and if the satisfying is achieved, the vertical height from the vertex to the base of a material level isosceles triangle is obtained as the material level of the to-be-measured object. The material level measuring method and system can continuously measure the material level of the to-be-measured object, the error is small, and the failure rate is low.
Description
[technical field]
The present invention relates to technical field of distance measurement, particularly relate to a kind of material level detection method and system.
[background technology]
At present contact and contactless is mainly divided into the Level measurement of particle object, contactless measurement is mainly single-point type and measures, single sending point sends the ultrasound wave of ultrasound wave and single acceptance point reception sending point transmission, is recorded the thing position of particle object by short distance mensuration.
But the measurement blind area of above-mentioned contactless measurement is large, and is subject to the impact of the factor such as male and fomale(M&F), dielectric constant, humidity, viscosity, temperature conductivity lamp of object.Therefore, the measuring error of above-mentioned contactless measurement is large, failure rate is high, and cannot obtain the thing position of object in real time.
[summary of the invention]
Based on this, be necessary that the measuring error for above-mentioned contactless measurement is large, failure rate is high, and the problem of the thing position of object cannot be obtained in real time, a kind of material level detection method and system are provided.
A kind of material level detection method, comprises the following steps:
Detect the transmitting time of each ultrasonic signal and the interval of time of reception in four ultrasonic signals sent to object under test respectively, generate the transmission time of each ultrasonic signal, wherein, first ultrasonic signal is sent by first sensor and receives, second ultrasonic signal is sent by described first sensor and is received by the second sensor, 3rd ultrasonic signal is sent by described second sensor and is received, and the 4th ultrasonic signal is sent by described second sensor and received by described first sensor;
The transmission time of each ultrasonic signal is multiplied with the velocity of propagation of each ultrasonic signal respectively, generates the transmission range of each ultrasonic signal;
If the transmission range of four ultrasonic signals is all greater than default blind area distance, then obtain the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generate mean distance;
Judge whether mutually meet the approximately equal condition preset between the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance;
If, the summit then obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, wherein, the bottom side length of described thing position isosceles triangle is the location interval between described first sensor and described second sensor, two waist length of described thing position isosceles triangle and be any one in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance.
A kind of Level measurement system, comprising:
Transmission time detection module, for detecting the transmitting time of each ultrasonic signal and the interval of time of reception in four ultrasonic signals of object under test transmission respectively, generate the transmission time of each ultrasonic signal, wherein, first ultrasonic signal is sent by first sensor and receives, second ultrasonic signal is sent by described first sensor and is received by the second sensor, 3rd ultrasonic signal is sent by described second sensor and is received, and the 4th ultrasonic signal is sent by described second sensor and received by described first sensor;
Transmission range generation module, for being multiplied with the velocity of propagation of each ultrasonic signal respectively in the transmission time of each ultrasonic signal, generates the transmission range of each ultrasonic signal;
Mean distance module, for when the transmission range of four ultrasonic signals is all greater than default blind area distance, obtains the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generates mean distance;
First judge module, for judging whether mutually meet the approximately equal condition preset between the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance;
Level measurement module, for the transmission range at second ultrasonic signal, when mutually meeting described default approximately equal condition between the transmission range of the 4th ultrasonic signal and this three of described mean distance, the summit obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, wherein, the bottom side length of described thing position isosceles triangle is the location interval between described first sensor and described second sensor, two waist length of described thing position isosceles triangle and be the transmission range of second ultrasonic signal, in the transmission range of the 4th ultrasonic signal and described mean distance any one.
Above-mentioned material level detection method and system, the sensor simultaneously being possessed transmission-receiving function by two sends four ultrasonic signals to object under test, measures the transmission time of each ultrasonic signal; The transmission time of each ultrasonic signal is multiplied with the velocity of propagation of each ultrasonic signal respectively, generates the transmission range of each ultrasonic signal; If the transmission range of four ultrasonic signals is all greater than default blind area distance, then obtain the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generate mean distance; Judge whether mutually meet the approximately equal condition preset between the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance; If, the summit then obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, can not by the impact of the factor such as male and fomale(M&F), dielectric constant, humidity, viscosity, temperature conductivity lamp of object, the thing position of continuous coverage object under test, record the thing position of object in real time, and measuring error is little, failure rate is low.
[accompanying drawing explanation]
Fig. 1 is the schematic flow sheet of material level detection method first embodiment of the present invention;
Fig. 2 is the first structural representation of sensor in material level detection method first embodiment of the present invention;
Fig. 3 is the second structural representation of sensor in material level detection method first embodiment of the present invention;
Fig. 4 is relative position schematic diagram between sensor and object under test in material level detection method first embodiment of the present invention;
Fig. 5 is the schematic flow sheet of material level detection method second embodiment of the present invention;
Fig. 6 is relative position schematic diagram between sensor and object under test in material level detection method second embodiment of the present invention;
Fig. 7 is the schematic flow sheet of material level detection method of the present invention 3rd embodiment;
Fig. 8 is relative position schematic diagram between sensor and object under test in material level detection method of the present invention 3rd embodiment;
Fig. 9 is the structural representation of Level measurement system first embodiment of the present invention;
Figure 10 is the structural representation of Level measurement system second embodiment of the present invention;
Figure 11 is the structural representation of Level measurement system the 3rd embodiment of the present invention.
[embodiment]
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Refer to Fig. 1, Fig. 1 is the schematic flow sheet of material level detection method first embodiment of the present invention.
The described material level detection method of present embodiment, can comprise the following steps:
Step S101, detect the transmitting time of each ultrasonic signal and the interval of time of reception in four ultrasonic signals sent to object under test respectively, generate the transmission time of each ultrasonic signal, wherein, first ultrasonic signal is sent by first sensor and receives, second ultrasonic signal is sent by described first sensor and is received by the second sensor, 3rd ultrasonic signal is sent by described second sensor and is received, and the 4th ultrasonic signal is sent by described second sensor and received by described first sensor.
Step S102, was multiplied with the velocity of propagation of each ultrasonic signal respectively by the transmission time of each ultrasonic signal, generated the transmission range of each ultrasonic signal.
Step S103, if the transmission range of four ultrasonic signals is all greater than default blind area distance, then obtains the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generates mean distance.
Step S104, judges whether mutually meet the approximately equal condition preset between the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance.
Step S105, if, the summit then obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, wherein, the bottom side length of described thing position isosceles triangle is the location interval between described first sensor and described second sensor, two waist length of described thing position isosceles triangle and be any one of the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance.
Present embodiment, the sensor simultaneously being possessed transmission-receiving function by two sends four ultrasonic signals to object under test, measures the transmission time of each ultrasonic signal; The transmission time of each ultrasonic signal is multiplied with the velocity of propagation of each ultrasonic signal respectively, generates the transmission range of each ultrasonic signal; If the transmission range of four ultrasonic signals is all greater than default blind area distance, then obtain the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generate mean distance; Judge whether mutually meet the approximately equal condition preset between the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance; If, the summit then obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, can not by the impact of the factor such as male and fomale(M&F), dielectric constant, humidity, viscosity, temperature conductivity lamp of object, the thing position of continuous coverage object under test, record the thing position of object in real time, and measuring error is little, failure rate is low.
Wherein, for step S101, the time of reception of detection is preferably the time that first time receives each ultrasonic signal.Described determinand can be particle, as ice cube.
Preferably, first sensor and the second sensor can be respectively bore hydraucone as shown in Figure 2, can effectively reduce and take measurement of an angle, and improve emissivity and the acceptance rate of ultrasonic signal.
Further, by first sensor and the second sensor to object under test four ultrasonic signals time, first ultrasonic signal and second ultrasonic signal can be the class ultrasonic signal that first sensor sends simultaneously, and the 3rd ultrasonic signal and the 3rd ultrasonic signal can be the class ultrasonic signal that the second sensor sends simultaneously.In other embodiments, first sensor and the second sensor also can divide four dispensing four ultrasonic signals respectively.
In one embodiment, detect the transmitting time of each ultrasonic signal and the interval of time of reception in four ultrasonic signals sent to object under test respectively, the step generating the transmission time of each ultrasonic signal comprises the following steps:
Send first ultrasonic signal by first sensor A to object under test, and record the transmitting time of first ultrasonic signal.
Receive first ultrasonic signal by first sensor A again, and record the time of reception of first ultrasonic signal, obtain the transmitting time of first ultrasonic signal and the difference of time of reception, generate the transmission time of first ultrasonic signal.
Send second ultrasonic signal by first sensor A to object under test, and record the transmitting time of second ultrasonic signal.
Receive second ultrasonic signal by the second sensor B, and record the time of reception of second ultrasonic signal, obtain the transmitting time of second ultrasonic signal and the difference of time of reception, generate the transmission time of second ultrasonic signal.
Send the 3rd ultrasonic signal by the second sensor B to object under test, and record the transmitting time of the 3rd ultrasonic signal.
Receive the 3rd ultrasonic signal by first sensor A, and record the time of reception of the 3rd ultrasonic signal, obtain the 3rd transmitting time of ultrasonic signal and the difference of time of reception, generate the transmission time of the 3rd ultrasonic signal.
Send the 4th ultrasonic signal by the second sensor B to object under test, and record the transmitting time of the 4th ultrasonic signal.
Receive the 4th ultrasonic signal by the second sensor B, and record the time of reception of the 4th ultrasonic signal, obtain the 4th transmitting time of ultrasonic signal and the difference of time of reception, generate the transmission time of the 4th ultrasonic signal.
Wherein, when measuring the transmission time of each ultrasonic signal, the corresponding aftershock time of measuring first sensor or the second sensor each ultrasonic signal corresponding.
Preferably, the frequency of four ultrasonic signals is different.Convenient each ultrasonic signal of differentiation, in case the error detection of different ultrasonic signal.
Further, before sending ultrasonic signal by first sensor A or the second sensor B, as shown in Figure 3, silica gel sheath 130 can be added at the fixed position of fixation of sensor, to effectively reduce the interference between the resonance of sensor and two sensors.
In another embodiment, can preset sense cycle, each sense cycle detects the transmission time of four ultrasonic signals.
For step S102, the velocity of propagation of ultrasonic signal is preferably the aerial velocity of propagation of ultrasonic signal, also can measure the velocity of propagation of ultrasonic signal in advance according to actual propagation environment.
For step S103, if the aftershock time of a corresponding ultrasonic signal is less than aftershock time threshold, then judge that the transmission range of described ultrasonic signal is greater than default blind area distance.If the aftershock time of corresponding four ultrasonic signals is all less than aftershock time threshold, then the transmission range of four ultrasonic signals is all greater than default blind area distance.
Preferably, preset blind area distance to calculate by following formula (1):
h＝d1/2tana (1)；
Wherein, h is described default blind area distance, and d1 is the location gap between first sensor and the second sensor, and a is the maximum half taken measurement of an angle of first sensor or the second sensor.
In one embodiment, material level detection method of the present invention also can comprise the following steps:
If the transmission range of the transmission range of first ultrasonic signal or the 3rd ultrasonic signal is not more than described default blind area distance, then obtain the location interval between described first sensor and described second sensor.
Obtain the square value of transmission range of second ultrasonic signal and the difference of the square value of described location interval, and the square root obtaining described difference is the first correction transmission range.
Obtain the difference of the square value of the transmission range of the 4th ultrasonic signal and the square value of described location interval, and the square root obtaining described difference is the second correction transmission range.
Choose the thing position that the described first minimum value revised in transmission range and described second correction transmission range is described object under test.
Wherein, the aftershock time of corresponding first ultrasonic signal or the aftershock time of corresponding second ultrasonic signal bigger than normal, then judge that the transmission range of first ultrasonic signal or the transmission range of second ultrasonic signal are not more than described default blind area distance.
Preferably, also can using the half of the minimum value chosen as measuring thing position.
Further, before the step obtaining the location interval between described first sensor and described second sensor, further comprising the steps of:
Judge whether the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal are greater than described default blind area distance.
If be greater than, then obtain the location interval between described first sensor and described second sensor.
If be not more than, then choose the thing position that transmission range minimum in the transmission range of four ultrasonic signals is described object under test.
Further, revise before transmission range and the described second minimum value revised in transmission range be the step of thing position of described object under test choosing described first, further comprising the steps of:
Judge whether the described first difference revising transmission range and described second corrected range is greater than described location interval, if be greater than, then judges that this is measured unsuccessfully.
If be not more than described location interval, then judge that described first correction transmission range or described second is revised transmission range and whether is greater than default maximum thing position height, if be greater than, then judge that this measures unsuccessfully, if be not more than, then choose the thing position that the described first minimum value revised in transmission range and described second correction transmission range is described object under test.
If be not more than described location interval, or judge whether the described first minimum value revised in transmission range and described second correction transmission range is greater than the minimum value in the transmission range of described first ultrasonic signal and the transmission range of described 3rd ultrasonic signal, if be greater than, then judge that this is measured unsuccessfully.
In other embodiments, if the transmission range of the transmission range of second ultrasonic signal or the 4th ultrasonic signal is not more than described default blind area distance, and the transmission range of the transmission range of first ultrasonic signal and the 3rd ultrasonic signal is greater than described default blind area distance, then judge that this is measured unsuccessfully.
For step S104, it is 0 or in the difference range preset that described default approximately equal condition to can be in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance both difference arbitrarily, if-1cm is to 1cm.
Preferably, by calculating the difference of in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance any two, judge whether to meet described default approximately equal condition, also judge by other means that those skilled in the art are usual.
For step S105, preferably, three summits of described thing position isosceles triangle can be respectively the peak of the location point residing for first sensor, the location point residing for the second sensor and object under test.
Preferably, the thing position of described object under test is the apogee distance first sensor of described object under test and the vertical range of the second sensor place plane.As shown in Figure 4, first sensor 110 and the second sensor 120 transmission path of four ultrasonic signals that sends and receive as shown in phantom in figure 4.Three summits of described thing position isosceles triangle can be respectively the peak of the center point residing for first sensor 110, the center point residing for the second sensor 120 and object under test.Location interval between first sensor 110 and the second sensor 120 is d1.The base of the container of carrying object under test is wide is d2.
Further, also can change to the vertical height on base the summit of the thing position isosceles triangle obtained, be converted to the minimum point of described object under test and the distance of peak.With the distance after changing into thing position.
Further, after getting the thing position of described object under test, can judge whether described object under test arrives default thing site, if arrive, then stop adding object under test.
In one embodiment, the step that the summit obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base comprises the following steps:
Obtain any one distance in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance square 1/4th, generate hypotenuse square value.
Obtain described location interval square 1/4th, generate straight flange square value.
Obtain the square root of difference between described hypotenuse square value and institute's straight flange square value, generate the thing position of described object under test.
Present embodiment, can obtain the thing position of object under test by Quick Measuring.
Preferably, also directly can obtain 1/2nd of any one distance in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance, then with obtain distance for hypotenuse long, with 1/2nd of described location interval for straight flange is long, obtained the vertical height of summit to base of described thing position isosceles triangle by Pythagorean theorem formula.
In other embodiments, the vertical height of summit to base of described thing position isosceles triangle is also obtained by the other technologies means that those skilled in the art are usual.
Refer to Fig. 5, Fig. 5 is the schematic flow sheet of material level detection method second embodiment of the present invention.
The described material level detection method of present embodiment and the difference of the first embodiment are: further comprising the steps of:
Step S501, if in the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance, both do not meet described default approximately equal condition arbitrarily, then judge whether the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal are all greater than two times of the location interval between described first sensor and described second sensor.
Step S502, if so, the minimum value then chosen in the transmission range of the transmission range of first ultrasonic signal, the transmission range of second ultrasonic signal, the transmission range of the 3rd ultrasonic signal and the 4th ultrasonic signal is the thing position of described object under test.
Present embodiment, when arbitrarily both do not meet described default approximately equal condition in the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance, the thing position of object under test can be detected quickly and accurately.
Preferably, as shown in Figure 6, first sensor 210 and the second sensor 220 transmission path of four ultrasonic signals that sends and receive is as shown in the dotted line in Fig. 6.Location interval between first sensor 210 and the second sensor 220 is d1.The base of the container of carrying object under test is wide is d2.
In other embodiments, also judge whether the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal are all greater than two times of the location interval between described first sensor and described second sensor by the technological means that this area is usual.
Refer to Fig. 7, Fig. 7 is the schematic flow sheet of material level detection method of the present invention 3rd embodiment.
The described material level detection method of present embodiment and the difference of the second embodiment are: further comprising the steps of:
Step S701, if any one is not more than two times of the location interval between described first sensor and described second sensor in the transmission range of the transmission range of second ultrasonic signal and the 4th ultrasonic signal, then obtain the location interval between described first sensor and described second sensor.
Step S702, obtains the square value of transmission range of second ultrasonic signal and the difference of the square value of described location interval, and the square root obtaining described difference is the 3rd correction transmission range.
Step S703, obtains the square value of transmission range of the 4th ultrasonic signal and the difference of the square value of described location interval, and the square root obtaining described difference is the 4th correction transmission range.
Step S704, chooses the thing position that the described 3rd revises transmission range, the described 4th minimum value revised in transmission range, the transmission range of first ultrasonic signal and the transmission range of the 4th ultrasonic signal is described object under test.
Present embodiment, when arbitrarily both do not meet described default approximately equal condition in the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance, the thing position of object under test can be detected quickly and accurately.
Preferably, as shown in Figure 8, first sensor 310 and the second sensor 320 transmission path of four ultrasonic signals that sends and receive as indicated by the dotted lines in figure 8.Location interval between first sensor 310 and the second sensor 320 is d1.The base of the container of carrying object under test is wide is d2.
In other embodiments, choose the described 3rd revise transmission range, before the described 4th minimum value revised in transmission range, the transmission range of first ultrasonic signal and the transmission range of the 4th ultrasonic signal is the step of thing position of described object under test, further comprising the steps of:
Judge whether the described 3rd difference revising transmission range and described 4th corrected range is greater than described location interval, if be greater than, then judges that this is measured unsuccessfully.
If be not more than described location interval, then judge that described 3rd correction transmission range or the described 4th is revised transmission range and whether is greater than default maximum thing position height, if be greater than, then judge that this measures unsuccessfully, if be not more than, then choose the thing position that the described 3rd revises transmission range, the described 4th minimum value revised in transmission range, the transmission range of first ultrasonic signal and the transmission range of the 4th ultrasonic signal is described object under test.
If be not more than described location interval, or judge whether the described 3rd minimum value revised in transmission range and described 4th correction transmission range is greater than the minimum value in the transmission range of described first ultrasonic signal and the transmission range of described 3rd ultrasonic signal, if be greater than, then judge that this is measured unsuccessfully.
Refer to Fig. 9, Fig. 9 is the structural representation of Level measurement system first embodiment of the present invention.
The described Level measurement system of present embodiment, can comprise transmission time detection module 1010, transmission range generation module 1020, mean distance generation module 1030, first judge module 1040 and Level measurement module 1050, wherein:
Transmission time detection module 1010, for detecting the transmitting time of each ultrasonic signal and the interval of time of reception in four ultrasonic signals of object under test transmission respectively, generate the transmission time of each ultrasonic signal, wherein, first ultrasonic signal is sent by first sensor and receives, second ultrasonic signal is sent by described first sensor and is received by the second sensor, 3rd ultrasonic signal is sent by described second sensor and is received, and the 4th ultrasonic signal is sent by described second sensor and received by described first sensor.
Transmission range generation module 1020, for being multiplied with the velocity of propagation of each ultrasonic signal respectively in the transmission time of each ultrasonic signal, generates the transmission range of each ultrasonic signal.
Mean distance module 1030, for when the transmission range of four ultrasonic signals is all greater than default blind area distance, obtains the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generates mean distance.
First judge module 1040, for judging whether mutually meet the approximately equal condition preset between the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance.
Level measurement module 1050, for the transmission range at second ultrasonic signal, when mutually meeting described default approximately equal condition between the transmission range of the 4th ultrasonic signal and this three of described mean distance, the summit obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, wherein, the bottom side length of described thing position isosceles triangle is the location interval between described first sensor and described second sensor, two waist length of described thing position isosceles triangle and be the transmission range of second ultrasonic signal, any one in the transmission range of the 4th ultrasonic signal and described mean distance.
Present embodiment, the sensor simultaneously being possessed transmission-receiving function by two sends four ultrasonic signals to object under test, measures the transmission time of each ultrasonic signal; The transmission time of each ultrasonic signal is multiplied with the velocity of propagation of each ultrasonic signal respectively, generates the transmission range of each ultrasonic signal; If the transmission range of four ultrasonic signals is all greater than default blind area distance, then obtain the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generate mean distance; Judge whether mutually meet the approximately equal condition preset between the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance; If, the summit then obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, can not by the impact of the factor such as male and fomale(M&F), dielectric constant, humidity, viscosity, temperature conductivity lamp of object, the thing position of continuous coverage object under test, record the thing position of object in real time, and measuring error is little, failure rate is low.
Wherein, for transmission time detection module 1010, the time of reception of detection is preferably the time that first time receives each ultrasonic signal.Described determinand can be particle, as ice cube.
Preferably, first sensor and the second sensor can be respectively bore hydraucone as shown in Figure 2, can effectively reduce and take measurement of an angle, and improve emissivity and the acceptance rate of ultrasonic signal.
Further, by first sensor and the second sensor to object under test four ultrasonic signals time, first ultrasonic signal and second ultrasonic signal can be the class ultrasonic signal that first sensor sends simultaneously, and the 3rd ultrasonic signal and the 3rd ultrasonic signal can be the class ultrasonic signal that the second sensor sends simultaneously.In other embodiments, first sensor and the second sensor also can divide four dispensing four ultrasonic signals respectively.
In one embodiment, transmission time detection module 1010 also can be used for:
Send first ultrasonic signal by first sensor A to object under test, and record the transmitting time of first ultrasonic signal.
Receive first ultrasonic signal by first sensor A again, and record the time of reception of first ultrasonic signal, obtain the transmitting time of first ultrasonic signal and the difference of time of reception, generate the transmission time of first ultrasonic signal.
Send second ultrasonic signal by first sensor A to object under test, and record the transmitting time of second ultrasonic signal.
Receive second ultrasonic signal by the second sensor B, and record the time of reception of second ultrasonic signal, obtain the transmitting time of second ultrasonic signal and the difference of time of reception, generate the transmission time of second ultrasonic signal.
Send the 3rd ultrasonic signal by the second sensor B to object under test, and record the transmitting time of the 3rd ultrasonic signal.
Receive the 3rd ultrasonic signal by first sensor A, and record the time of reception of the 3rd ultrasonic signal, obtain the 3rd transmitting time of ultrasonic signal and the difference of time of reception, generate the transmission time of the 3rd ultrasonic signal.
Send the 4th ultrasonic signal by the second sensor B to object under test, and record the transmitting time of the 4th ultrasonic signal.
Receive the 4th ultrasonic signal by the second sensor B, and record the time of reception of the 4th ultrasonic signal, obtain the 4th transmitting time of ultrasonic signal and the difference of time of reception, generate the transmission time of the 4th ultrasonic signal.
Wherein, when measuring the transmission time of each ultrasonic signal, the corresponding aftershock time of measuring first sensor or the second sensor each ultrasonic signal corresponding.
Preferably, the frequency of four ultrasonic signals is different.Convenient each ultrasonic signal of differentiation, in case the error detection of different ultrasonic signal.
Further, before sending ultrasonic signal by first sensor A or the second sensor B, as shown in Figure 3, silica gel sheath 130 can be added at the fixed position of fixation of sensor, to effectively reduce the interference between the resonance of sensor and two sensors.
In another embodiment, can preset sense cycle, each sense cycle detects the transmission time of four ultrasonic signals.
For transmission range generation module 1020, the velocity of propagation of ultrasonic signal is preferably the aerial velocity of propagation of ultrasonic signal, also can measure the velocity of propagation of ultrasonic signal in advance according to actual propagation environment.
For mean distance generation module 1030, if the aftershock time of a corresponding ultrasonic signal is less than aftershock time threshold, then judge that the transmission range of described ultrasonic signal is greater than default blind area distance.If the aftershock time of corresponding four ultrasonic signals is all less than aftershock time threshold, then the transmission range of four ultrasonic signals is all greater than default blind area distance.
Preferably, preset blind area distance to calculate by following formula (1):
h＝d1/2tana (1)；
Wherein, h is described default blind area distance, and d1 is the location gap between first sensor and the second sensor, and a is the maximum half taken measurement of an angle of first sensor or the second sensor.
In one embodiment, Level measurement system of the present invention also can comprise the first interval module, the first correcting module, the second correcting module and first choose module, wherein:
Described first interval module is used for when the transmission range of first ultrasonic signal or the transmission range of the 3rd ultrasonic signal are not more than described default blind area distance, obtains the location interval between described first sensor and described second sensor.
Described first correcting module is for the difference of the square value of the square value and described location interval that obtain the transmission range of second ultrasonic signal, and the square root obtaining described difference is the first correction transmission range.
Described second correcting module is for the difference of the square value of the square value and described location interval that obtain the transmission range of the 4th ultrasonic signal, and the square root obtaining described difference is the second correction transmission range.
Described first chooses module for choosing the thing position that the described first minimum value revised in transmission range and described second correction transmission range is described object under test.
Wherein, the aftershock time of corresponding first ultrasonic signal or the aftershock time of corresponding second ultrasonic signal bigger than normal, then judge that the transmission range of first ultrasonic signal or the transmission range of second ultrasonic signal are not more than described default blind area distance.
Preferably, also can using the half of the minimum value chosen as measuring thing position.
Further, also the second judge module can be comprised, for:
Judge whether the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal are greater than described default blind area distance.
If be greater than, then notify that described first interval module obtains the location interval between described first sensor and described second sensor.
If be not more than, then choose the thing position that transmission range minimum in the transmission range of four ultrasonic signals is described object under test.
Further, the 3rd judge module also can be comprised, for:
Judge whether the described first difference revising transmission range and described second corrected range is greater than described location interval, if be greater than, then judges that this is measured unsuccessfully.
If be not more than described location interval, then judge that described first correction transmission range or described second is revised transmission range and whether is greater than default maximum thing position height, if be greater than, then judge that this measures unsuccessfully, if be not more than, then notify that described first chooses the thing position that the module minimum value chosen in described first correction transmission range and described second correction transmission range is described object under test.
If be not more than described location interval, or judge whether the described first minimum value revised in transmission range and described second correction transmission range is greater than the minimum value in the transmission range of described first ultrasonic signal and the transmission range of described 3rd ultrasonic signal, if be greater than, then judge that this is measured unsuccessfully.
In other embodiments, if the transmission range of the transmission range of second ultrasonic signal or the 4th ultrasonic signal is not more than described default blind area distance, and the transmission range of the transmission range of first ultrasonic signal and the 3rd ultrasonic signal is greater than described default blind area distance, then judge that this is measured unsuccessfully.
For the first judge module 1040, it is 0 or in the difference range preset that described default approximately equal condition to can be in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance both difference arbitrarily, if-1cm is to 1cm.
Preferably, by calculating the difference of in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance any two, judge whether to meet described default approximately equal condition, also judge by other means that those skilled in the art are usual.
For Level measurement module 1050, preferably, three summits of described thing position isosceles triangle can be respectively the peak of the location point residing for first sensor, the location point residing for the second sensor and object under test.
Preferably, the thing position of described object under test is the apogee distance first sensor of described object under test and the vertical range of the second sensor place plane.As shown in Figure 4, first sensor 110 and the second sensor 120 transmission path of four ultrasonic signals that sends and receive as shown in phantom in figure 4.Three summits of described thing position isosceles triangle can be respectively the peak of the center point residing for first sensor 110, the center point residing for the second sensor 120 and object under test.Location interval between first sensor 110 and the second sensor 120 is d1.The base of the container of carrying object under test is wide is d2.
Further, also can change to the vertical height on base the summit of the thing position isosceles triangle obtained, be converted to the minimum point of described object under test and the distance of peak.With the distance after changing into thing position.
Further, after getting the thing position of described object under test, can judge whether described object under test arrives default thing site, if arrive, then stop adding object under test.
In one embodiment, Level measurement module 1050 also comprises the first acquisition module, the second acquisition module and the 3rd acquisition module, wherein:
Described first acquisition module for obtain any one distance in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance square 1/4th, generate hypotenuse square value.
Described second acquisition module for obtain described location interval square 1/4th, generate straight flange square value.
Described 3rd acquisition module, for obtaining the square root of difference between described hypotenuse square value and institute's straight flange square value, generates the thing position of described object under test.
Present embodiment, can obtain the thing position of object under test by Quick Measuring.
Preferably, also directly can obtain 1/2nd of any one distance in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance, then with obtain distance for hypotenuse long, with 1/2nd of described location interval for straight flange is long, obtained the vertical height of summit to base of described thing position isosceles triangle by Pythagorean theorem formula.
In other embodiments, the vertical height of summit to base of described thing position isosceles triangle is also obtained by the other technologies means that those skilled in the art are usual.
Refer to Figure 10, Figure 10 is the structural representation of Level measurement system second embodiment of the present invention.
The described Level measurement system of present embodiment and the difference of the first embodiment are: comprise transmission time detection module 2010, transmission range generation module 2020, mean distance generation module 2030, first judge module 2040, second judge module 2050 and second choose module 2060, wherein:
Second judge module 2050, for when both do not meet described default approximately equal condition arbitrarily in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance, judges whether the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal are all greater than two times of the location interval between described first sensor and described second sensor.
Second when choosing module 2060 for being all greater than two times of location interval between described first sensor and described second sensor in the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal, and the minimum value chosen in the transmission range of the transmission range of first ultrasonic signal, the transmission range of second ultrasonic signal, the transmission range of the 3rd ultrasonic signal and the 4th ultrasonic signal is the thing position of described object under test.
Present embodiment, when arbitrarily both do not meet described default approximately equal condition in the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance, the thing position of object under test can be detected quickly and accurately.
Wherein, transmission time detection module 2010, transmission range generation module 2020, mean distance generation module 2030 and the first judge module 2040 transmission time detection module 1010 shown in corresponding diagram 9, transmission range generation module 1020, mean distance generation module 1030 and the first judge module 1040 respectively.
Preferably, as shown in Figure 6, first sensor 210 and the second sensor 220 transmission path of four ultrasonic signals that sends and receive is as shown in the dotted line in Fig. 6.Location interval between first sensor 210 and the second sensor 220 is d1.The base of the container of carrying object under test is wide is d2.
In other embodiments, also judge whether the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal are all greater than two times of the location interval between described first sensor and described second sensor by the technological means that this area is usual.
Refer to Figure 11, Figure 11 is the structural representation of Level measurement system the 3rd embodiment of the present invention.
The described Level measurement system of present embodiment and the difference of the second embodiment are: transmission time detection module 3010, transmission range generation module 3020, mean distance generation module 3030, first judge module 3040, second judge module 3050, second interval module 3060, the 3rd correcting module 3070, the 4th correcting module 3080 and the 3rd choose module 3090, wherein:
Second interval module 3060, for when any one is not more than two times of location interval between described first sensor and described second sensor in the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal, obtains the location interval between described first sensor and described second sensor.
3rd correcting module 3070 is for the difference of the square value of the square value and described location interval that obtain the transmission range of second ultrasonic signal, and the square root obtaining described difference is the 3rd revise transmission range.
4th correcting module 3080 is for the difference of the square value of the square value and described location interval that obtain the transmission range of the 4th ultrasonic signal, and the square root obtaining described difference is the 4th revise transmission range.
3rd chooses module 3090 for choosing the thing position that the described 3rd revises transmission range, the described 4th minimum value revised in transmission range, the transmission range of first ultrasonic signal and the transmission range of the 4th ultrasonic signal is described object under test.
Present embodiment, when arbitrarily both do not meet described default approximately equal condition in the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance, the thing position of object under test can be detected quickly and accurately.
Wherein, transmission time detection module 3010, transmission range generation module 3020, mean distance generation module 3030 and the first judge module 3040 transmission time detection module 1010 shown in corresponding diagram 9, transmission range generation module 1020, mean distance generation module 1030 and the first judge module 1040 respectively.The second judge module 2050 shown in the corresponding Figure 10 of second judge module 3050.
Preferably, as shown in Figure 8, first sensor 310 and the second sensor 320 transmission path of four ultrasonic signals that sends and receive as indicated by the dotted lines in figure 8.Location interval between first sensor 310 and the second sensor 320 is d1.The base of the container of carrying object under test is wide is d2.
In other embodiments, choose the described 3rd revise transmission range, before the described 4th minimum value revised in transmission range, the transmission range of first ultrasonic signal and the transmission range of the 4th ultrasonic signal is the step of thing position of described object under test, further comprising the steps of:
Judge whether the described 3rd difference revising transmission range and described 4th corrected range is greater than described location interval, if be greater than, then judges that this is measured unsuccessfully.
If be not more than described location interval, then judge that described 3rd correction transmission range or the described 4th is revised transmission range and whether is greater than default maximum thing position height, if be greater than, then judge that this measures unsuccessfully, if be not more than, then choose the thing position that the described 3rd revises transmission range, the described 4th minimum value revised in transmission range, the transmission range of first ultrasonic signal and the transmission range of the 4th ultrasonic signal is described object under test.
If be not more than described location interval, or judge whether the described 3rd minimum value revised in transmission range and described 4th correction transmission range is greater than the minimum value in the transmission range of described first ultrasonic signal and the transmission range of described 3rd ultrasonic signal, if be greater than, then judge that this is measured unsuccessfully.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a material level detection method, is characterized in that, comprises the following steps:
Detect the transmitting time of each ultrasonic signal and the interval of time of reception in four ultrasonic signals sent to object under test respectively, generate the transmission time of each ultrasonic signal, wherein, first ultrasonic signal is sent by first sensor and receives, second ultrasonic signal is sent by described first sensor and is received by the second sensor, 3rd ultrasonic signal is sent by described second sensor and is received, and the 4th ultrasonic signal is sent by described second sensor and received by described first sensor;
The transmission time of each ultrasonic signal is multiplied with the velocity of propagation of each ultrasonic signal respectively, generates the transmission range of each ultrasonic signal;
If the transmission range of four ultrasonic signals is all greater than default blind area distance, then obtain the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generate mean distance;
Judge whether mutually meet the approximately equal condition preset between the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance;
If, the summit then obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, wherein, the bottom side length of described thing position isosceles triangle is the location interval between described first sensor and described second sensor, two waist length of described thing position isosceles triangle and be any one in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance.
2. material level detection method according to claim 1, is characterized in that:
If the transmission range of the transmission range of first ultrasonic signal or the 3rd ultrasonic signal is not more than described default blind area distance, then obtain the location interval between described first sensor and described second sensor;
Obtain the square value of transmission range of second ultrasonic signal and the difference of the square value of described location interval, and the square root obtaining described difference is the first correction transmission range;
Obtain the difference of the square value of the transmission range of the 4th ultrasonic signal and the square value of described location interval, and the square root obtaining described difference is the second correction transmission range;
Choose the thing position that the described first minimum value revised in transmission range and described second correction transmission range is described object under test.
3. material level detection method according to claim 1, is characterized in that:
If in the transmission range of the transmission range of second ultrasonic signal, the 4th ultrasonic signal and this three of described mean distance, both do not meet described default approximately equal condition arbitrarily, then judge whether the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal are all greater than two times of the location interval between described first sensor and described second sensor;
If so, the minimum value then chosen in the transmission range of the transmission range of first ultrasonic signal, the transmission range of second ultrasonic signal, the transmission range of the 3rd ultrasonic signal and the 4th ultrasonic signal is the thing position of described object under test.
4. material level detection method according to claim 3, is characterized in that:
If any one is not more than two times of the location interval between described first sensor and described second sensor in the transmission range of the transmission range of second ultrasonic signal and the 4th ultrasonic signal, then obtain the location interval between described first sensor and described second sensor;
Obtain the square value of transmission range of second ultrasonic signal and the difference of the square value of described location interval, and the square root obtaining described difference is the 3rd correction transmission range;
Obtain the difference of the square value of the transmission range of the 4th ultrasonic signal and the square value of described location interval, and the square root obtaining described difference is the 4th correction transmission range;
Choose the thing position that the described 3rd revises transmission range, the described 4th minimum value revised in transmission range, the transmission range of first ultrasonic signal and the transmission range of the 4th ultrasonic signal is described object under test.
5. material level detection method as claimed in any of claims 1 to 4, is characterized in that, the step that the summit obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base comprises the following steps:
Obtain any one distance in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance square 1/4th, generate hypotenuse square value;
Obtain described location interval square 1/4th, generate straight flange square value;
Obtain the square root of difference between described hypotenuse square value and institute's straight flange square value, generate the thing position of described object under test.
6. a Level measurement system, is characterized in that, comprising:
Transmission time detection module, for detecting the transmitting time of each ultrasonic signal and the interval of time of reception in four ultrasonic signals of object under test transmission respectively, generate the transmission time of each ultrasonic signal, wherein, first ultrasonic signal is sent by first sensor and receives, second ultrasonic signal is sent by described first sensor and is received by the second sensor, 3rd ultrasonic signal is sent by described second sensor and is received, and the 4th ultrasonic signal is sent by described second sensor and received by described first sensor;
Transmission range generation module, for being multiplied with the velocity of propagation of each ultrasonic signal respectively in the transmission time of each ultrasonic signal, generates the transmission range of each ultrasonic signal;
Mean distance module, for when the transmission range of four ultrasonic signals is all greater than default blind area distance, obtains the mean value of the transmission range of first ultrasonic signal and the transmission range of the 3rd ultrasonic signal, generates mean distance;
First judge module, for judging whether mutually meet the approximately equal condition preset between the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance;
Level measurement module, for the transmission range at second ultrasonic signal, when mutually meeting described default approximately equal condition between the transmission range of the 4th ultrasonic signal and this three of described mean distance, the summit obtaining thing position isosceles triangle is the thing position of described object under test to the vertical height on base, wherein, the bottom side length of described thing position isosceles triangle is the location interval between described first sensor and described second sensor, two waist length of described thing position isosceles triangle and be the transmission range of second ultrasonic signal, in the transmission range of the 4th ultrasonic signal and described mean distance any one.
7. Level measurement system according to claim 6, is characterized in that, also comprises the first interval module, the first correcting module, the second correcting module and first choose module, wherein:
Described first interval module is used for when the transmission range of first ultrasonic signal or the transmission range of the 3rd ultrasonic signal are not more than described default blind area distance, obtains the location interval between described first sensor and described second sensor;
Described first correcting module is for the difference of the square value of the square value and described location interval that obtain the transmission range of second ultrasonic signal, and the square root obtaining described difference is the first correction transmission range;
Described second correcting module is for the difference of the square value of the square value and described location interval that obtain the transmission range of the 4th ultrasonic signal, and the square root obtaining described difference is the second correction transmission range;
Described first chooses module for choosing the thing position that the described first minimum value revised in transmission range and described second correction transmission range is described object under test.
8. Level measurement system according to claim 6, is characterized in that, also comprises the second judge module and second and chooses module, wherein:
Described second judge module, for when both do not meet described default approximately equal condition arbitrarily in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and this three of described mean distance, judges whether the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal are all greater than two times of the location interval between described first sensor and described second sensor;
Described second when choosing module for being all greater than two times of location interval between described first sensor and described second sensor in the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal, and the minimum value chosen in the transmission range of the transmission range of first ultrasonic signal, the transmission range of second ultrasonic signal, the transmission range of the 3rd ultrasonic signal and the 4th ultrasonic signal is the thing position of described object under test.
9. Level measurement system according to claim 8, is characterized in that, also comprises the second interval module, the 3rd correcting module, the 4th correcting module and the 3rd choose module, wherein:
When described second interval module is used for that any one is not more than two times of location interval between described first sensor and described second sensor in the transmission range of second ultrasonic signal and the transmission range of the 4th ultrasonic signal, obtain the location interval between described first sensor and described second sensor;
Described 3rd correcting module is for the difference of the square value of the square value and described location interval that obtain the transmission range of second ultrasonic signal, and the square root obtaining described difference is the 3rd revise transmission range;
Described 4th correcting module is for the difference of the square value of the square value and described location interval that obtain the transmission range of the 4th ultrasonic signal, and the square root obtaining described difference is the 4th revise transmission range;
Described 3rd chooses module for choosing the thing position that the described 3rd revises transmission range, the described 4th minimum value revised in transmission range, the transmission range of first ultrasonic signal and the transmission range of the 4th ultrasonic signal is described object under test.
10. according to the Level measurement system in claim 6 to 9 described in any one, it is characterized in that, described Level measurement module also comprises the first acquisition module, the second acquisition module and the 3rd acquisition module, wherein:
Described first acquisition module for obtain any one distance in the transmission range of second ultrasonic signal, the transmission range of the 4th ultrasonic signal and described mean distance square 1/4th, generate hypotenuse square value;
Described second acquisition module for obtain described location interval square 1/4th, generate straight flange square value;
Described 3rd acquisition module, for obtaining the square root of difference between described hypotenuse square value and institute's straight flange square value, generates the thing position of described object under test.
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