CN107830882A - Alarm method and device based on ultrasonic wave - Google Patents
Alarm method and device based on ultrasonic wave Download PDFInfo
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- CN107830882A CN107830882A CN201710994625.8A CN201710994625A CN107830882A CN 107830882 A CN107830882 A CN 107830882A CN 201710994625 A CN201710994625 A CN 201710994625A CN 107830882 A CN107830882 A CN 107830882A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/48—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means
- G01D5/50—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means derived from a radioactive source
- G01D5/52—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means derived from a radioactive source detected by a counter tube
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M1/00—Design features of general application
- G06M1/27—Design features of general application for representing the result of count in the form of electric signals, e.g. by sensing markings on the counter drum
Abstract
The present invention provides a kind of alarm method and device based on ultrasonic wave, including launches the first ultrasonic signal and receive the second ultrasonic signal being reflected back；First ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting, signal after being handled；Crystal oscillation signal caused by signal after the processing and crystal oscillator is subjected to secondary signal processing, obtains counting pulse signal；The counting pulse signal is counted, obtains the number of pulses in each predetermined period；Judge whether the changing value of the number of pulses in the adjacent predetermined period exceedes predetermined number threshold value, if changing value exceedes the predetermined number threshold value, triggering alarm.The present invention can effectively improve detection sensitivity, improve the stability and antijamming capability of testing result.
Description
Technical field
The present invention relates to signal processing technology field, more particularly to a kind of alarm method and device based on ultrasonic wave.
Background technology
Warning device be for prevention occur certain event produce adverse consequences, reminded in the form of sound, light, air pressure etc. or
Warning user should take certain electronic product taken action.With the development of science and technology its be widely used in system failure detection,
The fields such as safety precaution, communications and transportation, medical aid, emergency disaster relief, sensing detection.
Existing warning device can determine whether object movement by infrared detection.Infrared warning device is to temperature
Degree is sensitive, and the infrared ray that the higher object radiation of temperature goes out is stronger, when sensing the radiation that exists in environment and be higher by background intensity
When, just triggering alarm.And infrared warning device is had a great influence by external environment, solar radiation, temperature, extraneous radio frequency signals
Deng can all be impacted to it.I.e. in the case of temperature anomaly, situation that infrared warning device will be reported by mistake causes
Infrared warning device interference free performance is poor, sensitivity is low, while testing result low precision.
Therefore, a kind of high sensitivity is needed badly, stability is good, the alarm method and device of strong antijamming capability.
The content of the invention
The present invention provides a kind of alarm method and device based on ultrasonic wave, is filled with solving infrared alarming in the prior art
Put that interference free performance is poor, sensitivity is low, while the problem of testing result low precision, with improve the antijamming capability of warning device,
Sensitivity and stability.
One side of the invention provides a kind of alarm method based on ultrasonic wave, including：
Launch the first ultrasonic signal and receive the second ultrasonic signal being reflected back；
First ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting, believed after being handled
Number；
Crystal oscillation signal caused by signal after the processing and crystal oscillator is subjected to secondary signal processing, obtains count pulse letter
Number；
The counting pulse signal is counted, obtains the number of pulses in each predetermined period；
Judge whether the changing value of the number of pulses in the adjacent predetermined period exceedes predetermined number threshold value, if becoming
Change value exceedes the predetermined number threshold value, then triggering alarm.
In one embodiment of the invention, above-mentioned first signal transacting includes：XOR processing；
Accordingly, first ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting, obtained
The processing after signal be square-wave signal；
It is accordingly, described that first ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting,
Signal after being handled, including：
First ultrasonic signal is converted into the first square-wave signal, second ultrasonic signal is converted into second
Square-wave signal；
First square-wave signal and second square-wave signal are subjected to XOR processing, obtain the square-wave signal.
In one embodiment of the invention, crystal oscillation signal caused by above-mentioned crystal oscillator has predeterminated frequency；
Accordingly, crystal oscillation signal caused by signal after the processing and crystal oscillator is subjected to secondary signal processing, counted
Before pulse signal, in addition to：Obtain the crystal oscillation signal；
It is described to obtain the crystal oscillation signal, specifically include：
The first pulse signal with first frequency is obtained by crystal oscillator；
First pulse signal is divided, obtains the crystal oscillation signal with the predeterminated frequency.
It is above-mentioned that the counting pulse signal is counted in one embodiment of the invention, obtain in each predetermined period
Number of pulses, including：
The counting pulse signal is received, and first time counting is carried out to the counting pulse signal, first is obtained and counts
Number；
Judge whether first counts reach the max-thresholds of first counts；
If result is yes, continue second of counting to the counting pulse signal, obtain the second counts；
According to first counts and the second counts sum, it is determined that the umber of pulse in each predetermined period
Amount.
In one embodiment of the invention, whether the above-mentioned changing value for judging the number of pulses in the adjacent predetermined period
More than predetermined number threshold value, if changing value exceedes the predetermined number threshold value, after triggering alarm, in addition to：
Obtain the changing value of the number of pulses in each adjacent predetermined period in preset duration；
According to the changing value of the number of pulses in each adjacent predetermined period, the changing value of the number of pulses is determined
Average value；
According to the average value of the changing value of the number of pulses, the predetermined number threshold value is configured.
Another aspect of the invention provides a kind of warning device based on ultrasonic wave, including：Sending module, receiving module,
First processing module, Second processing module, counting module, judge module, determining module；
Wherein, the sending module, for launching the first ultrasonic signal；
The receiving module, for receiving the second ultrasonic signal being reflected back；
The first processing module, for first ultrasonic signal and second ultrasonic signal to be carried out into first
Signal transacting, signal after being handled；
The Second processing module, for crystal oscillation signal caused by signal after the processing and crystal oscillator to be carried out into secondary signal
Processing, obtains counting pulse signal；
The counting module, for being counted to the counting pulse signal, obtain the pulse in each predetermined period
Quantity；
The judge module, for judging whether the changing value of the number of pulses in the adjacent predetermined period exceedes
Predetermined number threshold value；
The determining module, for triggering alarm when changing value exceedes the predetermined number threshold value.
In one embodiment of the invention, above-mentioned first signal transacting includes：XOR processing；
Accordingly, first ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting, obtained
The processing after signal be square-wave signal；
Accordingly, the first processing module, including：First processing units, second processing unit, the 3rd processing unit；
The first processing units, for first ultrasonic signal to be converted into the first square-wave signal；
The second processing unit, for second ultrasonic signal to be converted into the second square-wave signal；
3rd processing unit, for first square-wave signal and second square-wave signal to be carried out at XOR
Reason, obtains the square-wave signal.
In one embodiment of the invention, crystal oscillation signal caused by above-mentioned crystal oscillator has predeterminated frequency；
Accordingly, described device also includes：Crystal oscillator module, the crystal oscillator module, for obtaining the crystal oscillation signal；
The crystal oscillator module, is specifically included：Crystal oscillator unit, frequency unit；
The crystal oscillator unit, for obtaining the first pulse signal with first frequency by crystal oscillator；
The frequency unit, for being divided to the first pulse signal, obtain the crystal oscillator with the predeterminated frequency and believe
Number.
In one embodiment of the invention, above-mentioned counting module includes：First counting unit, the second counting unit；
First counting unit, for receiving the counting pulse signal, and the is carried out to the counting pulse signal
Once count, obtain the first counts；
Second counting unit, for judging whether first counts reach first counts most
Big threshold value, if result is yes, continue second of counting to the counting pulse signal, obtain the second counts, and
According to first counts and the second counts sum, it is determined that the number of pulses in each predetermined period.
In one embodiment of the invention, above-mentioned determining module, it is additionally operable to：Obtain in preset duration in each adjacent predetermined period
The changing value of the number of pulses, according to the changing value of the number of pulses in each adjacent predetermined period, determine the pulse
The average value of the changing value of quantity；
Accordingly, described device also includes configuration module；
The configuration module, for the average value of the changing value according to the number of pulses, configure the predetermined number threshold
Value.
As shown from the above technical solution, the present invention provides a kind of alarm method and device based on ultrasonic wave, including transmitting
First ultrasonic signal simultaneously receives the second ultrasonic signal being reflected back；By first ultrasonic signal and the described second ultrasound
Ripple signal carries out the first signal transacting, signal after being handled；Signal after the processing is entered with crystal oscillation signal caused by crystal oscillator
The processing of row secondary signal, obtains counting pulse signal；The counting pulse signal is counted, obtained in each predetermined period
Number of pulses；Judge whether the changing value of the number of pulses in the adjacent predetermined period exceedes predetermined number threshold value,
If changing value exceedes the predetermined number threshold value, triggering alarm.The present invention can effectively improve detection sensitivity, improve detection knot
The stability and antijamming capability of fruit.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet for the alarm method based on ultrasonic wave that one embodiment of the invention provides；
Fig. 2 is the schematic flow sheet for the alarm method based on ultrasonic wave that another embodiment of the present invention provides；
Fig. 3 is the schematic flow sheet for the alarm method based on ultrasonic wave that further embodiment of this invention provides；
Fig. 4 is the structural representation for the warning device based on ultrasonic wave that one embodiment of the invention provides；
Fig. 5 is the structural representation for the warning device based on ultrasonic wave that another embodiment of the present invention provides.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Embodiment one
The present embodiment provides a kind of alarm method based on ultrasonic wave, as shown in figure 1, this method can include：
Step 101, launch the first ultrasonic signal and receive the second ultrasonic signal being reflected back；
In this step, ultrasonic wave Sensitive Apparatus can be used as the emitting head of transmitter with receiving head, ultrasonic transmitter
The ultrasonic wave being reflected back is received to detected field emission constant amplitude ultrasonic wave, and by ultrasonic receiver.When in no motive objects
When body enters detected region, it should be constant amplitude to launch and receive ultrasonic wave, when the object for having activity enters detected area
During domain, the amplitude of ultrasonic and phase of reception, and constantly change.
Step 102, the first ultrasonic signal and the second ultrasonic signal are subjected to the first signal transacting, believed after being handled
Number；
, can be right in order to detect whether the amplitude of the first ultrasonic signal and the second ultrasonic signal and phase difference occur
First ultrasonic signal and the second ultrasonic signal carry out the first signal transacting.Oscilloscope measurement, time can specifically be used
The modes such as interval measurement, voltage measurement carry out the first signal transacting to the first ultrasonic signal and the second ultrasonic signal and obtained everywhere
Signal after reason, signal can effectively show the first ultrasonic signal and be deposited with the second ultrasonic signal in amplitude and phase after processing
Difference.
Step 103, crystal oscillation signal caused by signal after processing and crystal oscillator is subjected to secondary signal processing, obtains count pulse
Signal；
Because signal may represent the first ultrasonic signal and the second ultrasonic signal in amplitude and phase after processing
Existing difference, then secondary signal processing can be further carried out to signal after processing, the feature of signal after further raising processing.
Specifically, the crystal oscillation signal with fixed frequency can be obtained by crystal oscillator or crystal oscillating circuit first, its
It is secondary that crystal oscillation signal and signal after processing are subjected to secondary signal processing, it can obtain and believe with the count pulse of crystal oscillation signal same frequency
Number, it is easy to more effectively extraction and each class feature of signal after detection process.
Step 104, counting pulse signal is counted, obtains the number of pulses in each predetermined period；
Counting pulse signal has fixed frequency, i.e., the number stability of interior pulse signal vibration per second is high, so as to
Further the counting pulse signal for handling to obtain through secondary signal is counted, obtains predetermined period inside counting pulse signal
Number of pulses.
Specifically, the length of predetermined period can be chosen according to actual conditions, due to passing through crystal oscillation signal frequency caused by crystal oscillator
Rate is generally very high, and this just makes counting pulse signal also have higher frequency, therefore the time that predetermined period is set can not be long,
In order to improve the sensitivity of counting and actual effect, usual predetermined period can choose 0.1s.
Step 105, judge whether the changing value of number of pulses in adjacent predetermined period exceedes predetermined number threshold value, if becoming
Change value exceedes predetermined number threshold value, then triggering alarm；
When detected region do not have object by when, when the generation and transmitting of counting pulse signal should be etc., when having
When the object of activity enters detected region, the number of pulses of counting pulse signal significantly reduces.Therefore, according under different time
The changing value of number of pulses, it can be determined that be detected region whether have object by, and then determine whether triggering alarm.
Specifically, adjacent default week can be obtained by being counted to number of pulses in adjacent predetermined period
The changing value of number of pulses in phase, can be by the changing value of number of pulses and predetermined number threshold in order to exclude the possibility of erroneous judgement
Value is compared, if changing value exceedes predetermined number threshold value, triggering alarm.The size of predetermined number threshold value can be according to the external world
Environment is adjusted, to improve the stability and reliability of detection.
The alarm method based on ultrasonic wave that the present embodiment provides, including launch the first ultrasonic signal and receive and be reflected back
The second ultrasonic signal；First ultrasonic signal and the second ultrasonic signal are subjected to the first signal transacting, after obtaining processing
Signal；Signal carries out secondary signal processing with crystal oscillation signal caused by crystal oscillator after handling, and obtains counting pulse signal；To counting
Pulse signal is counted, and obtains the number of pulses in each predetermined period；Judge number of pulses in adjacent predetermined period
Whether changing value exceedes predetermined number threshold value, if changing value exceedes predetermined number threshold value, triggering alarm.What the present embodiment provided
Alarm method based on ultrasonic wave can effectively improve detection sensitivity, improve the stability and antijamming capability of testing result.
Embodiment two
The present embodiment provides a kind of alarm method based on ultrasonic wave, as shown in Fig. 2 this method can include：
Step 201, launch the first ultrasonic signal and receive the second ultrasonic signal being reflected back；
Emitting head and reception head of the ultrasonic wave Sensitive Apparatus as transmitter can be used, ultrasonic transmitter is to detected area
Constant amplitude ultrasonic wave is launched in domain, and receives the ultrasonic wave being reflected back by ultrasonic receiver.Visited when entering in no mobile object
When surveying region, it should be constant amplitude to launch and receive ultrasonic wave, when the object for having activity enters detected region, reception
Amplitude of ultrasonic and phase, and constantly change.
It is 10 meters that ultrasonic wave is used in the present embodiment as detection signal, the effective reconnaissance range of ultrasonic wave, can be improved tested
The scope in region is surveyed, improves detection efficiency and accuracy.
In the present embodiment, ultrasonic wave Sensitive Apparatus UCM-40T/R can be adopted as ultrasonic wave transmitting, reception sensing
Device, ultrasonic wave Sensitive Apparatus have good temperature characterisitic, vibration resistance and impact resistance, can effectively control warning circuit.
Step 202, the first ultrasonic signal is converted into the first square-wave signal, the second ultrasonic signal is converted into second
Square-wave signal；
The the first ultrasonic signal branch that ultrasonic transmitter can be launched exports a ultrasonic signal, and branch is exported
A ultrasonic signal be converted into the first square-wave signal；
The second ultrasonic signal that ultrasonic receiver receives is subjected to addition processing simultaneously, then filtered device circuit is carried out
Filtering process, and then the second ultrasonic signal after being filtered processing is amplified by processing by dual-stage amplifier, with right
Second ultrasonic signal gain, improve the performance of the second ultrasonic signal.Finally by comparator by the by enhanced processing
Two ultrasonic signals are converted into the second square-wave signal by sine wave.
Step 203, the first square-wave signal and the second square-wave signal are subjected to XOR processing, obtain square-wave signal.
, can be by first party in order to detect whether the amplitude of the first square-wave signal and the second square-wave signal and phase difference occur
Ripple signal and the second square-wave signal carry out XOR processing, obtain square-wave signal.Square-wave signal can effectively show the first ultrasonic wave
Signal and the second ultrasonic signal are in difference present on amplitude and phase.
By the way that the first ultrasonic signal and the second ultrasonic signal are converted into square wave, and the two is carried out at XOR
Reason, make transmitting with receive ultrasonic wave phase difference it is more efficient, accurately be detected, and transmitting and reception ultrasonic wave
Testing result is not exported during constant amplitude, also improves detection efficiency, reduces nonessential input and output amount.
Step 204, crystal oscillation signal caused by square-wave signal and crystal oscillator is subjected to secondary signal processing, obtains count pulse letter
Number；
Specifically, secondary signal processing can include：Phase and processing.By by square-wave signal and crystal oscillation signal carry out mutually with
Processing so that obtain the counting pulse signal with crystal oscillation signal same frequency, be easy to more effective extraction and detection square-wave signal
Vibration characteristics.
Optionally, crystal oscillation signal caused by crystal oscillator has predeterminated frequency in this step；
Accordingly, before the step 204, can also include：Obtain crystal oscillation signal；
Specifically, obtaining crystal oscillation signal can include：
The first pulse signal with first frequency is obtained by crystal oscillator；
First pulse signal is divided, obtains the crystal oscillation signal with predeterminated frequency.
Specifically the first pulse signal with first frequency can be produced by external crystal oscillation circuit or built-in crystal oscillator chip,
The first frequency of usual first pulse signal is 12MHz.And then according to the actual requirements, 4 are carried out to 12MHz the first pulse signal
Frequency dividing, obtain the crystal oscillation signal of the predeterminated frequency with 3MHz.
By being divided to the first pulse signal, the frequency of crystal oscillation signal can be effectively reduced, is fitted by obtaining frequency
In crystal oscillation signal, improve the Stability and veracity of subsequent counter.
Accordingly, because crystal oscillation signal has predeterminated frequency, then by phase and the counting pulse signal that is obtained after processing
With with crystal oscillation signal identical frequency.
Step 205, count pick up pulse signal, and first time counting is carried out to counting pulse signal, obtain first and count
Number；
Because counting pulse signal has upper frequency, then consideration is needed to be separately provided whether a counter can meet one
Count requirement in individual predetermined period, thus can by setting multiple counters repeatedly to count counting pulse signal,
To improve the precision counted.Avoid causing measurement result poor accuracy because of the limitation of counter local count threshold value.
Specifically, the first counter and the second counter can be set, the first counter can have two double four countings
Device cascade is formed, and the second counter can have 16 high-frequency counters to form.First counter and the second counter collectively form
24 high-positioned counters, it can fully meet the count requirement to high-frequency pulse signal.First counter is in count pick up pulse
Counting pulse signal is counted after signal, counts number of pulses.
For example, the second counter can use CD4060 high-frequency counters, the CD4060 high-frequency counter voltage models
Width is enclosed, operating voltage range can adjust in 3V~15V, and input impedance is high.
Step 206, judge whether the first counts reach the max-thresholds of the first counts；
Because the model of counter is different, there is maximum limitation in its counts, to prevent counter overflow, then need to sentence
Whether the first current counts of breaking reach the max-thresholds of the counts of the first counter, and the reliable of counting is improved with this
Property and accuracy.
Step 207, if result is yes, continue second of counting to counting pulse signal, obtain the second counting time
Number；
If judging, the first current counts reach the max-thresholds of the counts of the first counter, can not be followed by
It is continuous that counting pulse signal is continued to count by the first counter, now need to believe count pulse by the second counter
Number continue second of counting, and obtain the second counts.
By repeatedly being counted to counting pulse signal, avoid and surpass because the number of pulses of counting pulse signal is excessive
The counting max-thresholds of counter are crossed, the problem of so as to cause count results inaccuracy, improve the reliability and stably of detection
Property.
Step 208, according to the first counts and the second counts sum, it is determined that the umber of pulse in each predetermined period
Amount.
Accordingly, if judging, the first current counts are not reaching to the maximum threshold of the counts of the first counter
Value, then determine the number of pulses in each predetermined period according to the first counts.
In the present embodiment, for the first counter while count pick up pulse signal, the second counter starts timing, passes through
Stop timing after time as defined in predetermined period.By count in this predetermined period the first counts and the second counts it
With finally determine the number of pulses in this predetermined period.
Optionally, predetermined period has corresponding relation with counting pulse signal frequency.Due to needing to be obtained in predetermined period
The number of pulses of counting pulse signal is taken, then in order to obtain the suitable number of pulses of quantity, improves the stability of detection and accurate
Degree, when counting pulse signal frequency is higher, the duration needs that predetermined period is set are shorter.Meanwhile consider and be detected
The scale size and translational speed of mobiles in region, when the frequency of counting pulse signal is 3MHz, corresponding default week
Phase could be arranged to 0.1s, by obtaining the change of pulse number in adjacent 0.1s, be detected whether region has object in detection
It is more sensitive and conveniently when mobile.
By setting the corresponding relation of predetermined period and counting pulse signal frequency, make warning device to the thing that quickly moves
Body has more good Detection results, and the diameter of object to be detected small can reach 1cm, and detection sensitivity is high, stability is good, anti-interference
Ability is strong, overcomes the shortcomings that conventional IR intrusion detector sensitivity is low, valid analysing range is small.
Step 209, judge whether the changing value of number of pulses in adjacent predetermined period exceedes predetermined number threshold value, if becoming
Change value exceedes predetermined number threshold value, then triggering alarm.
When detected region do not have object by when, when the generation and transmitting of counting pulse signal should be etc., when having
When the object of activity enters detected region, the number of pulses of counting pulse signal significantly reduces.Therefore, according under different time
The changing value of number of pulses, it can be determined that be detected region whether have object by, and then determine whether triggering alarm.
Specifically, adjacent default week can be obtained by being counted to number of pulses in adjacent predetermined period
The changing value of number of pulses in phase, can be by the changing value of number of pulses and predetermined number threshold in order to exclude the possibility of erroneous judgement
Value is compared, if changing value exceedes predetermined number threshold value, triggering alarm.The size of predetermined number threshold value can be according to the external world
Environment is adjusted, to improve the stability and reliability of detection.
The alarm method based on ultrasonic wave that the present embodiment provides, including launch the first ultrasonic signal and receive and be reflected back
The second ultrasonic signal；First ultrasonic signal and the second ultrasonic signal are subjected to the first signal transacting, after obtaining processing
Signal；Signal carries out secondary signal processing with crystal oscillation signal caused by crystal oscillator after handling, and obtains counting pulse signal；To counting
Pulse signal is counted, and obtains the number of pulses in each predetermined period；Judge number of pulses in adjacent predetermined period
Whether changing value exceedes predetermined number threshold value, if changing value exceedes predetermined number threshold value, triggering alarm.What the present embodiment provided
Alarm method based on ultrasonic wave can effectively improve detection sensitivity, improve the stability and antijamming capability of testing result.
Embodiment three
The present embodiment provides a kind of alarm method based on ultrasonic wave, as shown in figure 3, this method can include：
Step 301, launch the first ultrasonic signal and receive the second ultrasonic signal being reflected back；
In this step, ultrasonic wave Sensitive Apparatus can be used as the emitting head of transmitter with receiving head, ultrasonic transmitter
The ultrasonic wave being reflected back is received to detected field emission constant amplitude ultrasonic wave, and by ultrasonic receiver.When in no motive objects
When body enters detected region, it should be constant amplitude to launch and receive ultrasonic wave, when the object for having activity enters detected area
During domain, the amplitude of ultrasonic and phase of reception, and constantly change.
Step 302, the first ultrasonic signal and the second ultrasonic signal are subjected to the first signal transacting, believed after being handled
Number；
, can be right in order to detect whether the amplitude of the first ultrasonic signal and the second ultrasonic signal and phase difference occur
First ultrasonic signal and the second ultrasonic signal carry out the first signal transacting.Oscilloscope measurement, time can specifically be used
The modes such as interval measurement, voltage measurement carry out the first signal transacting to the first ultrasonic signal and the second ultrasonic signal and obtained everywhere
Signal after reason, signal can effectively show the first ultrasonic signal and be deposited with the second ultrasonic signal in amplitude and phase after processing
Difference.
Step 303, crystal oscillation signal caused by signal after processing and crystal oscillator is subjected to secondary signal processing, obtains count pulse
Signal；
Because signal may represent the first ultrasonic signal and the second ultrasonic signal in amplitude and phase after processing
Existing difference, then secondary signal processing can be further carried out to signal after processing, the feature of signal after further raising processing.
Specifically, the crystal oscillation signal with fixed frequency can be obtained by crystal oscillator or crystal oscillating circuit first, its
It is secondary that crystal oscillation signal and signal after processing are subjected to secondary signal processing, it can obtain and believe with the count pulse of crystal oscillation signal same frequency
Number, it is easy to more effectively extraction and each class feature of signal after detection process.
Step 304, counting pulse signal is counted, obtains the number of pulses in each predetermined period；
Counting pulse signal has fixed frequency, i.e., the number stability of interior pulse signal vibration per second is high, so as to
Further the counting pulse signal for handling to obtain through secondary signal is counted, obtains predetermined period inside counting pulse signal
Number of pulses.
Specifically, the length of predetermined period can be chosen according to actual conditions, due to passing through crystal oscillation signal frequency caused by crystal oscillator
Rate is generally very high, and this just makes counting pulse signal also have higher frequency, therefore the time that predetermined period is set can not be long,
In order to improve the sensitivity of counting and actual effect, usual predetermined period can choose 0.1s.
Step 305, judge whether the changing value of number of pulses in adjacent predetermined period exceedes predetermined number threshold value, if becoming
Change value exceedes predetermined number threshold value, then triggering alarm.
When detected region do not have object by when, when the generation and transmitting of counting pulse signal should be etc., when having
When the object of activity enters detected region, the number of pulses of counting pulse signal significantly reduces.Therefore, according under different time
The changing value of number of pulses, it can be determined that be detected region whether have object by, and then determine whether triggering alarm.
Specifically, adjacent default week can be obtained by being counted to number of pulses in adjacent predetermined period
The changing value of number of pulses in phase, can be by the changing value of number of pulses and predetermined number threshold in order to exclude the possibility of erroneous judgement
Value is compared, if changing value exceedes predetermined number threshold value, triggering alarm.The size of predetermined number threshold value can be according to the external world
Environment is adjusted, to improve the stability and reliability of detection.
Specifically, output signal is used to represent whether the changing value of number of pulses in adjacent predetermined period exceedes present count
Threshold value is measured, if result is yes, output signal can trigger buzzer circuit or electric light is alarmed.
Meanwhile triggered in output signal after buzzer circuit or lighting circuit carry out alarm, buzzer circuit or
Lighting circuit removes alarm automatically within the preset alarm time, to be alarmed according to real-time output signal retriggered, improves
Efficiency of alarming and accuracy.
Optionally, can also include after step 305：
Step 306, the changing value of number of pulses in each adjacent predetermined period in preset duration is obtained；
Obtain the changing value of number of pulses in each adjacent predetermined period in one section of duration, for example, can obtain
Within 5min, the changing value of number of pulses in each adjacent 0.1s.
Step 307, according to the changing value of number of pulses in each adjacent predetermined period, the changing value of number of pulses is determined
Average value；
For example, can be obtained pre- to the changing value of number of pulses is averaged in each adjacent 0.1s within 5min
If the average value of the changing value of number of pulses in duration.
Step 308, according to the average value of the changing value of number of pulses, predetermined number threshold value is configured.
Step 306- steps 308 can apply to when warning device uses for the first time in certain environment or warning device is carried out
After resetting operation, for reconfiguring predetermined number threshold value.
By obtaining the average value of the changing value of number of pulses under current environment, effectively prevent because extraneous of short duration is done
Signal is disturbed, false alarm is caused such as spike.And make it that warning device portability is good, wide adaptation range, while externally
The change of boundary's environment has good antijamming capability.When external environment changes, warning device obtains arteries and veins under current environment automatically
The average value of the changing value of quantity is rushed, and then reconfigures threshold value, realizes the change of real-time dynamic monitoring external environment, further
Improve detection stability and precision.
Further, the preset configuration cycle can be set, threshold value is reconfigured every the preset configuration cycle, to enter
One step improves sensitivity and the reliability of alarm.
The alarm method based on ultrasonic wave that the present embodiment provides, including launch the first ultrasonic signal and receive and be reflected back
The second ultrasonic signal；First ultrasonic signal and the second ultrasonic signal are subjected to the first signal transacting, after obtaining processing
Signal；Signal carries out secondary signal processing with crystal oscillation signal caused by crystal oscillator after handling, and obtains counting pulse signal；To counting
Pulse signal is counted, and obtains the number of pulses in each predetermined period；Judge number of pulses in adjacent predetermined period
Whether changing value exceedes predetermined number threshold value, if changing value exceedes predetermined number threshold value, triggering alarm.What the present embodiment provided
Alarm method based on ultrasonic wave can effectively improve detection sensitivity, improve the stability and antijamming capability of testing result.
Example IV
The present embodiment provides a kind of warning device based on ultrasonic wave, as shown in figure 4, the device can include：Send mould
Block 41, receiving module 42, first processing module 43, Second processing module 44, counting module 45, judge module 46, determining module
47；
Wherein, sending module 41, for launching the first ultrasonic signal；
Receiving module 42, for receiving the second ultrasonic signal being reflected back；
First processing module 43, for the first ultrasonic signal and the second ultrasonic signal to be carried out into the first signal transacting,
Signal after being handled；
Second processing module 44, secondary signal processing is carried out with crystal oscillation signal caused by crystal oscillator for signal after handling,
Obtain counting pulse signal；
Counting module 45, for being counted to counting pulse signal, obtain the number of pulses in each predetermined period；
Judge module 46, for judging whether the changing value of number of pulses in adjacent predetermined period exceedes predetermined number threshold
Value；
Determining module 47, for triggering alarm when changing value exceedes predetermined number threshold value.
On the device in the present embodiment, wherein modules perform the concrete mode of operation in relevant this method
It is described in detail in embodiment, explanation will be not set forth in detail herein.
The warning device based on ultrasonic wave that the present embodiment provides, it is reflected back by launching the first ultrasonic signal and receiving
The second ultrasonic signal；First ultrasonic signal and the second ultrasonic signal are subjected to the first signal transacting, after obtaining processing
Signal；Signal carries out secondary signal processing with crystal oscillation signal caused by crystal oscillator after handling, and obtains counting pulse signal；To counting
Pulse signal is counted, and obtains the number of pulses in each predetermined period；Judge number of pulses in adjacent predetermined period
Whether changing value exceedes predetermined number threshold value, if changing value exceedes predetermined number threshold value, triggering alarm.What the present embodiment provided
Warning device based on ultrasonic wave can effectively improve detection sensitivity, improve the stability and antijamming capability of testing result.
Embodiment five
The present embodiment provides a kind of warning device based on ultrasonic wave, as shown in figure 5, the device can include：Send mould
Block 51, receiving module 52, first processing module 53, Second processing module 54, counting module 55, judge module 56, determining module
57；
Wherein, sending module 51, for launching the first ultrasonic signal；
Receiving module 52, for receiving the second ultrasonic signal being reflected back；
First 53 pieces of mould of processing, for the first ultrasonic signal and the second ultrasonic signal to be carried out into the first signal transacting,
Signal after being handled；
Second processing module 54, secondary signal processing is carried out with crystal oscillation signal caused by crystal oscillator for signal after handling,
Obtain counting pulse signal；
Counting module 55, for being counted to counting pulse signal, obtain the number of pulses in each predetermined period；
Judge module 56, for judging whether the changing value of number of pulses in adjacent predetermined period exceedes predetermined number threshold
Value；
Determining module 57, for triggering alarm when changing value exceedes predetermined number threshold value.
Optionally, the first signal transacting includes：XOR processing；
Accordingly, the first ultrasonic signal and the second ultrasonic signal are subjected to the first signal transacting, after obtained processing
Signal is square-wave signal；
Accordingly, first processing module 53, including：First processing units 531, the processing of second processing unit the 532, the 3rd are single
Member 533；
First processing units 531, for the first ultrasonic signal to be converted into the first square-wave signal；
Second processing unit 532, for the second ultrasonic signal to be converted into the second square-wave signal；
3rd processing unit 533, for the first square-wave signal and the second square-wave signal to be carried out into XOR processing, obtain square wave
Signal.
Further, crystal oscillation signal caused by crystal oscillator has predeterminated frequency；
Accordingly, device also includes：Crystal oscillator module 58, crystal oscillator module 58, for obtaining crystal oscillation signal；
Specifically, crystal oscillator module 58 includes：Crystal oscillator unit 581, frequency unit 582；
Crystal oscillator unit 581, for obtaining the first pulse signal with first frequency by crystal oscillator；
Frequency unit 582, for being divided to the first pulse signal, obtain the crystal oscillation signal with predeterminated frequency.
More progressive one, counting module 55 includes：First counting unit 551, the second counting unit 552；
First counting unit 551, first time counting is carried out for count pick up pulse signal, and to counting pulse signal,
Obtain the first counts；
Second counting unit 552, for judging whether the first counts reach the max-thresholds of the first counts, if
As a result it is yes, then continues second of counting to counting pulse signal, obtains the second counts, and according to the first counting time
Number and the second counts sum, it is determined that the number of pulses in each predetermined period；Accordingly, if the result is negative, then according to
One counts, it is determined that the number of pulses in each predetermined period.
Optionally, determining module 57, it is additionally operable to：Obtain the change of number of pulses in each adjacent predetermined period in preset duration
Change value, according to the changing value of number of pulses in each adjacent predetermined period, determine the average value of the changing value of number of pulses；
Accordingly, device also includes configuration module 59；
Configuration module 59, for the average value of the changing value according to number of pulses, configure predetermined number threshold value.
On the device in the present embodiment, wherein modules perform the concrete mode of operation in relevant this method
It is described in detail in embodiment, explanation will be not set forth in detail herein.
The warning device based on ultrasonic wave that the present embodiment provides, it is reflected back by launching the first ultrasonic signal and receiving
The second ultrasonic signal；First ultrasonic signal and the second ultrasonic signal are subjected to the first signal transacting, after obtaining processing
Signal；Signal carries out secondary signal processing with crystal oscillation signal caused by crystal oscillator after handling, and obtains counting pulse signal；To counting
Pulse signal is counted, and obtains the number of pulses in each predetermined period；Judge number of pulses in adjacent predetermined period
Whether changing value exceedes predetermined number threshold value, if changing value exceedes predetermined number threshold value, triggering alarm.What the present embodiment provided
Warning device based on ultrasonic wave can effectively improve detection sensitivity, improve the stability and antijamming capability of testing result.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
Programmed instruction related hardware is completed, and foregoing program can be stored in a computer read/write memory medium, the program
Upon execution, the step of execution includes above method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or light
Disk etc. is various can be with the medium of store program codes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modifications or replacement, the essence of appropriate technical solution is departed from the scope of various embodiments of the present invention technical scheme.
Claims (10)
- A kind of 1. alarm method based on ultrasonic wave, it is characterised in that including：Launch the first ultrasonic signal and receive the second ultrasonic signal being reflected back；First ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting, signal after being handled；Crystal oscillation signal caused by signal after the processing and crystal oscillator is subjected to secondary signal processing, obtains counting pulse signal；The counting pulse signal is counted, obtains the number of pulses in each predetermined period；Judge whether the changing value of the number of pulses in the adjacent predetermined period exceedes predetermined number threshold value, if changing value More than the predetermined number threshold value, then triggering alarm.
- 2. according to the method for claim 1, it is characterised in that first signal transacting includes：XOR processing；Accordingly, first ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting, obtained institute Signal is square-wave signal after stating processing；Accordingly, it is described that first ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting, obtain Signal after processing, including：First ultrasonic signal is converted into the first square-wave signal, second ultrasonic signal is converted into the second square wave Signal；First square-wave signal and second square-wave signal are subjected to XOR processing, obtain the square-wave signal.
- 3. according to the method for claim 1, it is characterised in that crystal oscillation signal caused by the crystal oscillator has predeterminated frequency；Accordingly, crystal oscillation signal caused by signal after the processing and crystal oscillator is subjected to secondary signal processing, obtains count pulse Before signal, in addition to：Obtain the crystal oscillation signal；It is described to obtain the crystal oscillation signal, specifically include：The first pulse signal with first frequency is obtained by crystal oscillator；First pulse signal is divided, obtains the crystal oscillation signal with the predeterminated frequency.
- 4. according to the method for claim 1, it is characterised in that it is described that the counting pulse signal is counted, obtain Number of pulses in each predetermined period, including：The counting pulse signal is received, and first time counting is carried out to the counting pulse signal, obtains the first counts；Judge whether first counts reach the max-thresholds of first counts；If result is yes, continue second of counting to the counting pulse signal, obtain the second counts；And according to First counts and the second counts sum, it is determined that the number of pulses in each predetermined period；If the result is negative, then according to first counts, it is determined that the number of pulses in each predetermined period.
- 5. according to the method any one of claim 1-4, it is characterised in that described to judge the adjacent predetermined period Whether the changing value of the interior number of pulses exceedes predetermined number threshold value, if changing value exceedes the predetermined number threshold value, touches Transmit messages after warning, in addition to：Obtain the changing value of the number of pulses in each adjacent predetermined period in preset duration；According to the changing value of the number of pulses in each adjacent predetermined period, determine that the changing value of the number of pulses is averaged Value；According to the average value of the changing value of the number of pulses, the predetermined number threshold value is configured.
- A kind of 6. warning device based on ultrasonic wave, it is characterised in that including：Sending module, receiving module, the first processing mould Block, Second processing module, counting module, judge module, determining module；Wherein, the sending module, for launching the first ultrasonic signal；The receiving module, for receiving the second ultrasonic signal being reflected back；The first processing module, for first ultrasonic signal and second ultrasonic signal to be carried out into the first signal Processing, signal after being handled；The Second processing module, for crystal oscillation signal caused by signal after the processing and crystal oscillator to be carried out at secondary signal Reason, obtains counting pulse signal；The counting module, for being counted to the counting pulse signal, obtain the number of pulses in each predetermined period；The judge module, it is default whether the changing value for judging the number of pulses in the adjacent predetermined period exceedes Amount threshold；The determining module, for triggering alarm when changing value exceedes the predetermined number threshold value.
- 7. device according to claim 6, it is characterised in that first signal transacting includes：XOR processing；Accordingly, first ultrasonic signal and second ultrasonic signal are subjected to the first signal transacting, obtained institute Signal is square-wave signal after stating processing；Accordingly, the first processing module, including：First processing units, second processing unit, the 3rd processing unit；The first processing units, for first ultrasonic signal to be converted into the first square-wave signal；The second processing unit, for second ultrasonic signal to be converted into the second square-wave signal；3rd processing unit, for first square-wave signal and second square-wave signal to be carried out into XOR processing, obtain To the square-wave signal.
- 8. device according to claim 6, it is characterised in that crystal oscillation signal caused by the crystal oscillator has predeterminated frequency；Accordingly, described device also includes：Crystal oscillator module, the crystal oscillator module, for obtaining the crystal oscillation signal；The crystal oscillator module, is specifically included：Crystal oscillator unit, frequency unit；The crystal oscillator unit, for obtaining the first pulse signal with first frequency by crystal oscillator；The frequency unit, for being divided to the first pulse signal, obtain the crystal oscillation signal with the predeterminated frequency.
- 9. device according to claim 6, it is characterised in that the counting module includes：First counting unit, the second meter Counting unit；First counting unit, carried out for the first time for receiving the counting pulse signal, and to the counting pulse signal Count, obtain the first counts；Second counting unit, for judging whether first counts reach the maximum threshold of first counts Value；If result is yes, continue second of counting to the counting pulse signal, obtain the second counts, and according to First counts and the second counts sum, it is determined that the number of pulses in each predetermined period；If the result is negative, then according to first counts, it is determined that the number of pulses in each predetermined period.
- 10. according to the device described in claim any one of 6-9, it is characterised in that the determining module, be additionally operable to：Obtain pre- If in duration in each adjacent predetermined period the number of pulses changing value, according to the pulse in each adjacent predetermined period The changing value of quantity, determine the average value of the changing value of the number of pulses；Accordingly, described device also includes configuration module；The configuration module, for the average value of the changing value according to the number of pulses, configure the predetermined number threshold value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112146232A (en) * | 2020-09-15 | 2020-12-29 | 珠海格力电器股份有限公司 | Humidifier and water shortage control method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201352377Y (en) * | 2008-12-23 | 2009-11-25 | 重庆工商大学 | Ultrasonic sensor monitoring alarm and computer shooting interface device |
| CN102236945A (en) * | 2011-04-19 | 2011-11-09 | 无锡辐导微电子有限公司 | Infrared detection system suitable for field of alarm |
| CN203203576U (en) * | 2013-04-26 | 2013-09-18 | 精华金属表面处理（深圳）有限公司 | Ultrasonic thickness meter |
| CN103365965A (en) * | 2013-06-21 | 2013-10-23 | 大唐移动通信设备有限公司 | Data summarizing method and device |
| CN103453957A (en) * | 2013-09-26 | 2013-12-18 | 山东思达特测控设备有限公司 | Ultrasonic flowmeter with pipe detection and self-correction functions |
| CN104678400A (en) * | 2015-02-12 | 2015-06-03 | 无锡市崇安区科技创业服务中心 | Ultrasonic ranging system employing pulse counting |
| CN106383351A (en) * | 2016-10-21 | 2017-02-08 | 苏州工业职业技术学院 | Ultrasonic intelligent ranging alarm system, rear end collision prevention method, and overtaking side direction collision prevention method |
-
2017
- 2017-10-23 CN CN201710994625.8A patent/CN107830882A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201352377Y (en) * | 2008-12-23 | 2009-11-25 | 重庆工商大学 | Ultrasonic sensor monitoring alarm and computer shooting interface device |
| CN102236945A (en) * | 2011-04-19 | 2011-11-09 | 无锡辐导微电子有限公司 | Infrared detection system suitable for field of alarm |
| CN203203576U (en) * | 2013-04-26 | 2013-09-18 | 精华金属表面处理（深圳）有限公司 | Ultrasonic thickness meter |
| CN103365965A (en) * | 2013-06-21 | 2013-10-23 | 大唐移动通信设备有限公司 | Data summarizing method and device |
| CN103453957A (en) * | 2013-09-26 | 2013-12-18 | 山东思达特测控设备有限公司 | Ultrasonic flowmeter with pipe detection and self-correction functions |
| CN104678400A (en) * | 2015-02-12 | 2015-06-03 | 无锡市崇安区科技创业服务中心 | Ultrasonic ranging system employing pulse counting |
| CN106383351A (en) * | 2016-10-21 | 2017-02-08 | 苏州工业职业技术学院 | Ultrasonic intelligent ranging alarm system, rear end collision prevention method, and overtaking side direction collision prevention method |
Non-Patent Citations (7)
| Title |
|---|
| 刘海成: "《AVR单片机原理及测控工程应用》", 30 June 2015 * |
| 李和贵: "火灾探测器的干扰因素与抑制", 《消防技术与产品信息》 * |
| 王川: "《电子测量技术与仪器》", 30 April 2014 * |
| 王显铎: "基于单片机的家庭防盗报警系统设计分析", 《电子技术》 * |
| 王晓明 等: "剩余电流式电气火灾监控系统智能算法的研究", 《建筑科学》 * |
| 胡显华: "火灾探测器误报警的原因及改进方法", 《电脑开发与应用》 * |
| 齐海英 等: "《数字电子技术基础》", 30 June 2017 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112146232A (en) * | 2020-09-15 | 2020-12-29 | 珠海格力电器股份有限公司 | Humidifier and water shortage control method thereof |
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