CN101835178A - Method for realizing remote wireless monitoring and wireless monitoring device - Google Patents
Method for realizing remote wireless monitoring and wireless monitoring device Download PDFInfo
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Abstract
The invention discloses a method for realizing remote wireless monitoring and a wireless monitoring device. The method comprises the following steps of: sensing and acquiring an analog sensing signal in real time; filtering the acquired analog sensing signal according to a preset filtering strategy; when a first triggering signal is received, outputting the acquired analog sensing signal for analog-to-digital (A/D) conversion to form a digital sampling signal, sending the digital sampling signal through a wireless communication module, performing timing at the same time, and at a set sampling time, generating and outputting a second triggering signal; and when the second triggering signal is received or no triggering signal is received, comparing a level value of the acquired analog sensing signal with a preset level threshold, and if the level value of the acquired analog sensing signal is more than the preset level threshold, triggering and outputting the first triggering signal. Through the method and the device, the related information of an emergency can be acquired in time and the working time of the wireless monitoring device can be ensured.
Description
Technical field
The present invention relates to wireless sensor network long-distance wireless monitoring technology, particularly a kind of method and wireless monitoring device of realizing long-distance wireless monitoring.
Background technology
Obtaining relevant Monitoring Data by engineering structure, rotating machinery, environment etc. are carried out long-term remote online monitoring, for structural design provides design considerations, is wireless sensor network technology important use and developing direction.Wherein, for some accident that in the long term monitoring process, occurs at random, be again the emphasis of on-line monitoring, the Monitoring Data when obtaining the accident generation has great importance in practice.For example, the heavy construction structure is carried out long-term remote online monitoring to monitor accidents such as typhoon, earthquake to obtain Monitoring Data, analyze its influence that engineering structure is produced and railway, bridge monitored and obtain Monitoring Data, with the research train by the time to the influence of its structure, for subsequent analysis, design and improvement provide reference; In addition, building is carried out temperature monitoring, can when accidents such as fire take place, obtain Monitoring Data in real time, in time report to the police, to reduce loss.
Fig. 1 is the structural representation of existing wireless monitoring device.Referring to Fig. 1, this wireless monitoring device is a wireless sensor network node, comprising: transducer, mould/number (A/D, Analog/Digital) conversion module, CPU module, wireless communication module and power module, wherein,
Transducer is used for thing to be collected is carried out perception, obtains the simulation perceptual signal, exports the A/D conversion module to;
In the practical application, thing to be collected can be an engineering mechanical device, also can be building, can also be the object that railroad bridge etc. need be monitored.
The A/D conversion module is used for the simulation perceptual signal that receives is carried out the A/D conversion, forms digital sampled signal, exports the CPU module to;
The CPU module is used for according to the Processing Algorithm that sets in advance the digital sampled signal of input being handled, being calculated, and obtains the relevant physical quantity of sampled signal, exports wireless communication module to;
In the practical application, Processing Algorithm can be provided with as required, and for example, for accidents such as monitoring typhoon, earthquakes, Processing Algorithm can be acceleration calculation algorithm and vibration amplitude computational algorithm etc., and relevant physical quantity is acceleration or vibration amplitude; And for accidents such as temperature monitorings, Processing Algorithm can be the temperature computation algorithm, and relevant physical quantity is the temperature amplitude.
Wireless communication module is used for the information of CPU module output is sent to monitoring center by wireless mode, so that the staff of monitoring center makes a concrete analysis of, judges according to the information of obtaining;
In the practical application, after the staff of monitoring center obtains relevant information, for example,, can analyze the intensity and the duration of accidents such as typhoon, earthquake for acceleration or vibration amplitude; For accidents such as temperature monitorings, can judge whether to take place fire alarm, so that in time take measures.
Power module is used to transducer, A/D conversion module, CPU module and wireless communication module to provide work required operating voltage.
In the practical application, when wireless monitoring device was in running order, A/D conversion module wherein, CPU module and wireless communication module all needed to consume bigger energy, and power consumption is bigger; And, need the transducer of driven for a part, because it is in acquisition state always, power consumption is also bigger, and power module uses battery that power supply is provided usually, because finite energy, make that the wireless monitoring device operating time is shorter, need often to change battery.In order to improve the operating time of wireless monitoring device, in the prior art, improved method is by each node of wireless monitoring device is set, for example, transducer, the A/D conversion module, the CPU module, wireless communication module is in deep sleep state in the dormancy period of setting, resting state comprises that module is in "on" position but does not work, be that holding state and the working power of cutting off module make module be in off-position, thing to be collected is not sampled and handle, and in the wake-up period of setting, wake each node up and enter operating state, gather Monitoring Data, handle and transmission, waking up herein comprises: for being in "on" position but idle module, this module directly enters operating state, and for the module that is in off-position, the working power of being responsible for this module of conducting makes it enter operating state, and dormancy period and wake-up period hocket.Like this, the dormancy period of setting is long more, wake-up period is short more, and the average energy consumption of device is just low more, and battery also just can be worked the longer time, thereby has prolonged the operating time of wireless monitoring device effectively.
But it is above-mentioned by setting dormancy period, wake-up period prolongs the method for wireless monitoring device operating time, because the dormancy period of setting is generally minute even hour rank, like this, when node is in resting state, must miss the unexpected incidents that take place at random, and catch less than to the Monitoring Data in the significant accident process of monitoring target, thereby, can not in time obtain the relevant information of accident in the very first time that accident takes place, for example, earthquake intensity information or fire alarm information, for instance, for accidents such as earthquakes, its duration may only be several seconds to tens seconds, if dormancy period is set at minute, then when earthquake takes place, wireless monitoring device may be in resting state, thereby can not obtain relevant seismic monitoring data.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that realizes long-distance wireless monitoring, can in time obtain the relevant information of accident, and can ensure the operating time of wireless monitoring device.
Another object of the present invention is to provide a kind of wireless monitoring device, can in time obtain the relevant information of accident, and can ensure the operating time of wireless monitoring device.
For achieving the above object, the method for long-distance wireless monitoring provided by the invention, this method comprises:
The transducer real-time perception is obtained the simulation perceptual signal;
Filtration module carries out filtering according to predefined filtering strategy to the simulation perceptual signal that obtains, when receiving first triggering signal, export the simulation perceptual signal that obtains to the A/D conversion module, when receiving second triggering signal or not receiving triggering signal, export the simulation perceptual signal that obtains to comparator;
The A/D conversion module carries out the A/D conversion with the simulation perceptual signal of filtering, forms digital sampled signal;
Comparator compares the simulation perceptual signal level value and the predefined level threshold of filtering, if simulation perceptual signal level value is greater than predefined level threshold, to CPU module output triggering signal;
The CPU module receives the triggering signal of comparator output, export first triggering signal to filtration module, receive the digital sampled signal of A/D conversion module output, send by wireless communication module, and carry out timing, the sampling time that is provided with then, generate and export second triggering signal to filtration module.
The step of the digital sampled signal of described reception A/D conversion module output further comprises:
The CPU module is handled the digital sampled signal that receives according to the Processing Algorithm that sets in advance, obtain the relevant physical quantity of sampled signal,, carry out the described step that sends by wireless communication module if be defined as accident, otherwise, export second triggering signal to filtration module.
Further comprise:, export the 3rd triggering signal to the A/D conversion module if the CPU module is defined as accident;
The A/D conversion module improves sample rate according in advance setting under the control of the 3rd triggering signal, the simulation perceptual signal of filtering is carried out the A/D conversion, forms digital sampled signal.
The time and the monitoring application requirements that continue according to accident are provided with the described sampling time.
A kind of method that realizes long-distance wireless monitoring, this method comprises:
Transducer real-time perception in the wake-up period that sets in advance is obtained the simulation perceptual signal, stops perception in the dormancy period that sets in advance;
Filtration module carries out filtering according to predefined filtering strategy to the simulation perceptual signal that obtains, when receiving first triggering signal, export the simulation perceptual signal that obtains to the A/D conversion module, when receiving second triggering signal or not receiving triggering signal, export the simulation perceptual signal that obtains to comparator;
The A/D conversion module carries out the A/D conversion with the simulation perceptual signal of filtering, forms digital sampled signal;
Comparator compares the simulation perceptual signal level value and the predefined level threshold of filtering, if simulation perceptual signal level value is greater than predefined level threshold, to CPU module output triggering signal;
The CPU module is according to the wake-up period and the dormancy period that set in advance, and in wake-up period, the control transducer carries out real-time perception, and in dormancy period, the control transducer stops perception; Receive the triggering signal of comparator output, export first triggering signal, receive the digital sampled signal of A/D conversion module output to filtration module, send by wireless communication module, and carry out timing, the sampling time that is provided with then, generate and export second triggering signal to filtration module.
A kind of wireless monitoring device, this device comprises: transducer, filtration module, comparator, A/D conversion module, CPU module, wireless communication module and power module, wherein,
Transducer is used for thing to be collected is carried out perception, obtains the simulation perceptual signal, exports filtration module to;
Filtration module, be used for the simulation perceptual signal of transducer output is carried out filtering according to predefined filtering strategy, after receiving first triggering signal, export the simulation perceptual signal of filtering to the A/D conversion module, after receiving second triggering signal, export the simulation perceptual signal of filtering to comparator;
Comparator, the simulation perceptual signal of the module output that is used to accept filter compares with predefined level threshold, at simulation perceptual signal level value during greater than predefined level threshold, to CPU module output triggering signal;
The A/D conversion module is used for the simulation perceptual signal that receives is carried out the A/D conversion, forms digital sampled signal, exports the CPU module to;
The CPU module is used to receive the triggering signal that comparator is exported, and exports first triggering signal to filtration module; Receive the digital sampled signal of A/D conversion module output, export wireless communication module to, and carry out timing, the sampling time that is provided with then, export second triggering signal to filtration module;
Wireless communication module is used for the information of CPU module output is sent by wireless mode;
Power module is used to transducer, filtration module, comparator, A/D conversion module, CPU module and wireless communication module to provide work required operating voltage.
Described filtration module is high pass filter or band pass filter, described device further comprises: adder, be used for the simulation perceptual signal of transducer output is carried out add operation, the level value of simulation perceptual signal is drawn high predefined level value and exported filtration module to.
Described CPU module is further used for after the digital sampled signal that receives the output of A/D conversion module, according to the Processing Algorithm that sets in advance the digital sampled signal of input is handled, obtain the relevant physical quantity of sampled signal, judge whether to be accident, if be defined as accident, execution exports the flow process of wireless communication module to, otherwise, export second triggering signal to filtration module.
Described CPU module is further used for after being defined as accident, exports the 3rd triggering signal to the A/D conversion module;
The A/D conversion module improves sample rate according in advance setting under the control of the 3rd triggering signal, the simulation perceptual signal of filtering is carried out the A/D conversion, forms digital sampled signal.
Further comprise: digital adjustable potentiometer according to the level threshold parameter that the CPU module sets in advance, adjusts the output to the level threshold parameter corresponding voltage value of the level threshold of comparator for the setting of CPU module.
Further comprise: catch period controller, be used to receive first triggering signal of CPU module output, wake A/D conversion module, CPU module and wireless communication module up and enter mode of operation, receive second triggering signal of CPU module output, A/D conversion module, CPU module and wireless communication module are placed resting state.
A kind of wireless monitoring device, this device comprises: transducer, filtration module, comparator, A/D conversion module, CPU module, wireless communication module and power module, wherein,
Transducer is used in the wake-up period that sets in advance thing to be collected being carried out real-time perception under the control of CPU module, obtains the simulation perceptual signal, exports filtration module to, stops perception in the dormancy period that sets in advance;
Filtration module, be used for the simulation perceptual signal of transducer output is carried out filtering according to predefined filtering strategy, after receiving first triggering signal, export the simulation perceptual signal of filtering to the A/D conversion module, after receiving second triggering signal, export the simulation perceptual signal of filtering to comparator;
Comparator, the simulation perceptual signal of the module output that is used to accept filter compares with predefined level threshold, at simulation perceptual signal level value during greater than predefined level threshold, to CPU module output triggering signal;
The A/D conversion module is used for the simulation perceptual signal that receives is carried out the A/D conversion, forms digital sampled signal, exports the CPU module to;
The CPU module is used for according to the wake-up period and the dormancy period that set in advance, and in wake-up period, the control transducer carries out real-time perception, and in dormancy period, the control transducer stops perception; Receive the triggering signal of comparator output, export first triggering signal to filtration module; Receive the digital sampled signal of A/D conversion module output, export wireless communication module to, and carry out timing, the sampling time that is provided with then, export second triggering signal to filtration module;
Wireless communication module is used for the information of CPU module output is sent by wireless mode;
Power module is used to transducer, filtration module, comparator, A/D conversion module, CPU module and wireless communication module to provide work required operating voltage.
Further comprise the switch that is arranged between power module and the transducer, described CPU module is in wake-up period, switch between turn-on power module and the transducer carries out real-time perception with the control transducer, in dormancy period, the switch between power cutoff module and the transducer stops perception with the control transducer.
As seen from the above technical solutions, a kind of method and wireless monitoring device of realizing long-distance wireless monitoring provided by the invention, the transducer real-time perception is obtained the simulation perceptual signal; Filtration module carries out filtering according to predefined filtering strategy to the simulation perceptual signal that obtains, when receiving first triggering signal, export the simulation perceptual signal that obtains to the A/D conversion module, when receiving second triggering signal or not receiving triggering signal, export the simulation perceptual signal that obtains to comparator; The A/D conversion module carries out the A/D conversion with the simulation perceptual signal of filtering, forms digital sampled signal; Comparator compares the simulation perceptual signal level value and the predefined level threshold of filtering, if simulation perceptual signal level value is greater than predefined level threshold, to CPU module output triggering signal; The CPU module receives the triggering signal of comparator output, export first triggering signal to filtration module, receive the digital sampled signal of A/D conversion module output, send by wireless communication module, and carry out timing, the sampling time that is provided with then, generate and export second triggering signal to filtration module.Like this, by comparator being set to have determined whether accident, before accident takes place, A/D conversion module, CPU module and wireless communication module are not worked, can effectively reduce the power consumption of wireless monitoring device, simultaneously, whether comparator can monitor accident in real time and take place, avoided leak monitoring to accident, can in time obtain the relevant information of accident, and the sampling time is different from the mode that existing dormancy period, wake-up period circulate successively, greatly reduce the power consumption of whole device, ensured the operating time of wireless monitoring device.
Description of drawings
Fig. 1 is the structural representation of existing wireless monitoring device.
Fig. 2 is an embodiment of the invention wireless monitoring device structural representation.
Fig. 3 realizes the method flow schematic diagram of long-distance wireless monitoring for the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
In the embodiment of the invention, by comparator is set, to simulate perceptual signal and predefined level threshold compares, if simulation perceptual signal level value is greater than predefined level threshold, triggering to the simulation perceptual signal sample, handle, calculating and wireless transmission, if simulation perceptual signal level value is not more than predefined level threshold, then do not handle, reduced since to the simulation perceptual signal sample, handle, calculating and the required power consumption of wireless transmission; And, to the simulation perceptual signal sample, handle, duration of calculating and wireless transmission is set to the time that accident continues, greatly reduce the time of device work, thereby prolonged the operating time of wireless monitoring device.
Fig. 2 is an embodiment of the invention wireless monitoring device structural representation.Referring to Fig. 2, this wireless monitoring device comprises: transducer, filtration module, comparator, A/D conversion module, CPU module, wireless communication module, catch period controller and power module, wherein,
Transducer is used in real time thing to be collected being carried out perception, obtains the simulation perceptual signal, exports filtration module to;
In the practical application, gathering thing can be engineering mechanical device, also can be building, can also be monitoring targets such as railroad bridge.
Transducer comprises vibrating sensor, temperature sensor, air velocity transducer, strain transducer, light sensor, torque sensor etc., be configured according to actual needs be used for the perception accident detecting sensor or be used for the transducer of perception monitor signal, the transducer of perception accident can be the transducer of perception monitor signal, also can be independent detecting sensor.For example, the object of monitoring for needs is the situation of earthquake, can dispose vibrating sensor, in order to the monitor earthquake accident; Object for the needs monitoring is a typhoon, can dispose vibrating sensor or air velocity transducer.
Filtration module, be used for the simulation perceptual signal of transducer output is carried out filtering according to predefined filtering strategy, when receiving first triggering signal, export the simulation perceptual signal of filtering to the A/D conversion module, when receiving second triggering signal or not receiving triggering signal, export the simulation perceptual signal of filtering to comparator;
In the present embodiment, predefined filtering strategy is determined according to the sensor senses object of configuration, for example, sensor senses object for configuration is the situation of earthquake, because the concentration of energy of earthquake is in low-frequency range, therefore, the filtering strategy just can be low-pass filtering, be about to filtration module and be designed to low pass filter, in order to the simulation perceptual signal beyond the low frequency is carried out filtering, to reduce the workload of follow-up comparison and calculating, reduce the power consumption of wireless monitoring device, simultaneously, reduce the interference and the influence of other non-monitoring targets, improved the accuracy of monitoring.For example, when the health status of monitoring large scale structure, the structural response that the monitor earthquake accident produces is important, and knocks or high frequency response that other situations such as electromagnetic interference produce is lost interest in artificial, thereby, can be set to low pass filter by filtration module.Certainly, in the practical application, also filtration module is set to high pass filter or band pass filter as required, and to being set to the situation of high pass or band pass filter, adder can be set, the simulation perceptual signal of transducer output is carried out add operation, the level value of simulation perceptual signal is drawn high predefined level value and exported filtration module to, so that the level of the simulation perceptual signal of filtration module filtering output is a positive level, thereby simplify the design of follow-up comparator.
In the practical application, during for the filtration module initialization, at this moment, do not receive any triggering signal, then the default setting simulation perceptual signal that will obtain exports comparator to.
Comparator, the simulation perceptual signal of the module output that is used to accept filter compares with predefined level threshold, if simulation perceptual signal level value greater than predefined level threshold, to CPU module output triggering signal, otherwise, do not deal with; Certainly, level value also can be set less than predefined level threshold, to CPU output triggering signal, their essence is difference not.
In the present embodiment, predefined level threshold can be provided with according to experience or technique known means according to aforesaid acquisition target, does not repeat them here.
Triggering signal can be predefined high or low level signal.
The A/D conversion module is used for the simulation perceptual signal that receives is carried out the A/D conversion, forms digital sampled signal, exports the CPU module to;
The CPU module is used to receive the triggering signal of comparator output, to filtration module and catch period controller and export first triggering signal.Receive the digital sampled signal of A/D conversion module output, export wireless communication module to, and carry out timing, the sampling time that is provided with then, to filtration module and catch period controller and export second triggering signal.
Because the interference of other factors such as environment, the simulation perceptual signal that may make comparator receive triggers the CPU module and exports first triggering signal greater than predefined level threshold, the simulation perceptual signal is gathered, handled and sends by wireless communication module, cause increase of wireless monitoring device power consumption and precision lower.Thereby, in the present embodiment, the CPU module is after the digital sampled signal that receives the output of A/D conversion module, according to the Processing Algorithm that sets in advance the digital sampled signal of input is handled, obtain the relevant physical quantity of sampled signal, judge whether to be accident, if be defined as accident, execution exports the flow process of wireless communication module to, and follow-up receive the digital sampled signal of A/D conversion module output after, no longer handle, directly digital sampled signal is exported to wireless communication module and send to reduce the power consumption that the CPU module is handled; Otherwise, export second triggering signal to filtration module and export the simulation perceptual signal of filtering to comparator with the control filtration module, reduce the power consumption of A/D conversion module and CPU module.
Certainly, in the practical application, in order further to reduce the power consumption of wireless monitoring device, the A/D conversion module also can carry out the A/D conversion to the simulation perceptual signal that receives according to different sampling policies.Like this, the CPU module further after being defined as accident, is exported the 3rd triggering signal to the A/D conversion module;
If the A/D conversion module does not receive the 3rd triggering signal, sample and the A/D conversion according to first sampling policy that sets in advance, form digital sampled signal, export the CPU module to, first sampling policy can be low sampling rate and short sampling period, like this, can reduce the sampling number in first sampling policy, promptly reduce the hits before accident takes place, thereby reduce the power consumption of gathering.And after receiving the 3rd triggering signal, sample and the A/D conversion according to second sampling policy that sets in advance, form digital sampled signal, export the CPU module to, second sampling policy can be high sampling rate and long sampling period, like this, can guarantee to obtain the accuracy of accident relevant information and enough amount of information.Being provided with specifically of first sampling policy and second sampling policy can be provided with according to actual needs, do not repeat them here.
In the present embodiment, can determine whether to have taken place accident according to the feature of accident.For example, in temperature monitoring system, the accident that monitoring is concerned about is fire or the temperature accident that rises sharply, the feature of accident is that temperature continues to raise, the different temperature values constantly that relatively collect of CPU module then, if temperature value meets the rule of sustainable growth in the time that is provided with, then can determine to have taken place accident, carry out the flow process that exports wireless communication module to; If during interference sample signals such as electromagnetic interference,, then can be judged to be wrong report, then export second triggering signal to filtration module owing in the time that is provided with, do not meet the rule of sustainable growth.In vibration monitor system, the accident that monitoring is concerned about is a typhoon, earthquake etc., the feature of accident be gather complete cycle signal maximum and mean value, if maximum that receives and mean value are all greater than the normal value that sets in advance, then can be defined as having taken place to cause that structure produces the accident of large deformation, after the CPU module is determined the accident of needs to have occurred, the CPU module will be controlled each relevant portion of wireless monitoring device, begin to improve the continuous intensive image data of sample rate and handle, analyze and calculate, export wireless communication module to and send, perhaps be stored in the built-in memory.Certainly, also can confirm to send alarm signal after the accident that needing to occur.If the CPU module is judged to be the false triggering incident, then continue to wait for accident.
In the practical application, Processing Algorithm can be provided with as required, and for example, for accidents such as monitoring typhoon, earthquakes, Processing Algorithm can be acceleration calculation algorithm and vibration amplitude computational algorithm etc., and relevant physical quantity is acceleration or vibration amplitude; And for accidents such as temperature monitorings, Processing Algorithm can be the temperature computation algorithm, and relevant physical quantity is the temperature amplitude.
In the present embodiment, sampling time can be according to the characteristic of monitoring target, be time of continuing of accident and/or, the monitoring application requirements is provided with, for example, for monitoring target is the situation of earthquake, because the time that earthquake continues was generally several seconds zero point to tens seconds, thereby it is 60 seconds or 120 seconds that the sampling time can be set, like this, can carry out complete monitoring to earthquake conditions, after arriving the sampling time of setting, wireless monitoring device comes back to initial condition, with respect to having the situation that rest period and awake period hocket now, can reduce power consumption greatly.Certainly, also can for example,, also can be set to several complete earthquake periods the sampling time according to actual needs because seismic frequency is generally several hertz to several hertz of zero points.In addition, sampling time can also judge whether accident finishes according to the relevant physical quantity characteristic value of the sampled signal of calculating, if the physical quantity characteristic value is less than the physical quantity characteristic value threshold value that sets in advance, wireless monitoring device comes back to initial condition.
Wireless communication module is used for the information of CPU module output is sent by wireless mode;
In the practical application, the CPU module can not handled the digital signal that receives, wireless communication module is sent to monitoring center with the information of CPU module output by wireless mode, the staff who waits until monitoring center makes a concrete analysis of, handles, judges according to the information of obtaining, to reduce the power consumption of CPU module, prolong its working life, after the staff of monitoring center obtains relevant information and handles, for example, for acceleration or vibration amplitude, can analyze the intensity and the duration of accidents such as typhoon, earthquake; For accidents such as temperature monitorings, can judge whether to take place fire alarm, so that in time take measures.
Catch period controller, be used to receive first triggering signal of CPU module output, wake A/D conversion module, CPU module and wireless communication module up and enter mode of operation, receive second triggering signal of CPU module output, A/D conversion module, CPU module and wireless communication module are placed resting state;
In the present embodiment, institute it should be noted that catching period controller is not the requisite module of the present invention, is in order further to reduce the power consumption of wireless monitoring device, to control the operating state of each module to reduce power consumption by catching period controller.Certainly, catch the operating state that period controller also can be used to control comparator and filtration module, but because in the practical application, the power consumption when comparator and filtration module work is extremely low, can consider.
Power module is used to transducer, filtration module, comparator, A/D conversion module, CPU module, catches period controller and wireless communication module provides work required operating voltage.
By as seen above-mentioned, the wireless monitoring device of the embodiment of the invention, by comparator being set and catching period controller, before accident takes place, catch period controller with the A/D conversion module, CPU module and wireless communication module place resting state, make transducer, filtration module and comparator enter mode of operation, like this, can effectively reduce the power consumption of wireless monitoring device, simultaneously can monitor accident in real time and whether take place, avoid leak monitoring accident, and when accident takes place, in time wake the A/D conversion module up, CPU module and wireless communication module, make it to enter mode of operation, gather, obtain the relevant information of accident, owing to the characteristic parameter of sampling time according to each monitoring target is provided with, after the sampling time, wireless monitoring device enters the dormancy monitoring, like this, not only can in time obtain the relevant information of accident, can also reduce the power consumption of whole device greatly, ensure the operating time of wireless monitoring device.
In the above-mentioned wireless monitoring device, predefined level threshold can be changed according to actual needs in the comparator, to adapt to dissimilar monitoring targets.Like this, wireless monitoring device further comprises: digital adjustable potentiometer according to level threshold parameter regulation self resistance that the CPU module is provided with, adjusts the output to the level threshold parameter corresponding voltage value of the level threshold of comparator for the setting of CPU module.Therefore,, can the triggering level threshold value program controlly neatly be set, make comparator more general by the digital regulation resistance of regulation voltage output is set.One end of comparator is connected with digital adjustable potentiometer, and the output by filter circuit is connected the other end with transducer, and comparator output is connected to the interruption input interface of CPU module.
The output voltage of transducer and perception amount are linear, the sensor senses incident, output simulation perceptual signal, it is voltage signal, after filter circuit removal interference, input to comparator, compare with the predefined level threshold of comparator, when signal of sensor during greater than the predefined level threshold of comparator, comparator is exported the triggering signal of high or low level to the middle fracture of CPU module, wake the CPU module up by interrupt mode, the CPU module is to filtration module and catch period controller and export first triggering signal, the A/D conversion module carries out the A/D conversion according to first sampling policy to the simulation perceptual signal that receives, the output digital sampled signal, the CPU module is calculated the digital sampled signal that receives, obtain the relevant physical quantity of sampled signal, if confirm as accident, export the 3rd triggering signal to the A/D conversion module, after the A/D conversion module receives the 3rd triggering signal, according to second sampling policy simulation perceptual signal that receives is carried out the A/D conversion, the output digital sampled signal is to the CPU module, the CPU module is exported the digital sampled signal of input to wireless communication module, and the sampling time that is provided with then, to filtration module and catch period controller export second triggering signal with control wireless monitoring device enter park mode, institute it should be noted that, the CPU module when park mode, can perception from the triggering signal of comparator.
Lift specific embodiment below, wireless monitoring device of the present invention is described.
Embodiment one:
In the present embodiment, transducer serviceability temperature transducer, velocity transducer, charge type vibrating sensor etc., these transducers all have extremely low power consumption or do not need working power to get final product work, and therefore, power module can provide keeps enough energy that the sensor is worked always.For the charge type transducer etc., need design to amplify modulate circuit, change aanalogvoltage output into physical quantity with perception.The simulation perceptual signal of sensor senses carries out filtering through filtration module, removes and the incoherent signal of accident.Filtration module can be designed on demand by resistance and electric capacity, changes frequency band range by adjusting the capacitance-resistance value, can be designed to low pass, high pass or band pass filter.If filtration module uses high pass or band pass filter, so through needing to use adder to move filtered simulation perceptual signal to a stable positive voltage value place after high pass or the band pass filter, to prevent negative voltage.The numeral adjustable potentiometer is connected with the CPU module, the CPU module is generally the microprocessors such as single-chip microcomputer of low-power consumption, by CPU module controls level threshold parameter, level threshold inserts an input pin of comparator, the another one input pin of comparator inserts transducer through nursing one's health filtered output voltage signal, when sensor sensing arrives the accident output voltage greater than level threshold, comparator is exported high or low warning pulse, wake CPU module and correlation module thereof up and enter operating state, the output voltage signal of transducer is analyzed, calculated.
Embodiment two:
Transducer uses thermocouple sensor, strain transducer, power transducer etc., this class transducer needs driving voltage usually or provides power supply to work, for such transducer, if transducer is worked always, its power consumption is also bigger, has reduced the operating time of wireless monitoring device.Thereby, in the present embodiment, for the less demanding accident of some real-times, in order further to prolong the time of wireless monitoring device work, can between power module and transducer, switch be set, for example, the metal-oxide-semiconductor switch is by the CPU module or catch the break-make of period controller control metal-oxide-semiconductor switch.Catch period controller and be further used for break-make according to the wake-up period that sets in advance and dormancy period control metal-oxide-semiconductor switch, at dormancy period, turn-off the metal-oxide-semiconductor switch, power path between the module of cutting off the electricity supply and the transducer places resting state with A/D conversion module, CPU module and wireless communication module simultaneously; At wake-up period, conducting metal-oxide-semiconductor switch, the power path between turn-on power module and the transducer, the CPU module is after the triggering signal that receives comparator output, and execution is to filtration module and catch the flow process that period controller is exported first triggering signal.If the CPU module determines not have accident to take place, then enter dormancy period in wake-up period; Take place if the CPU module defines accident in wake-up period, then carry out flow process from the 3rd triggering signal to the A/D conversion module that export.Like this, because in wake-up period, A/D conversion module in the wireless monitoring device, CPU module and wireless communication module are also only just worked when being defined as accident, with respect to having wireless monitoring device is in mode of operation in whole wake-up period situation now, can prolong its operating time.In the practical application, can the dormancy period setting is shorter, not leak accident as far as possible.For example, come monitor temperature with thermocouple sensor, if the operating current of thermocouple sensor and filter circuit is 20mA, battery capacity is 2Ah, the shortest time of thermocouple sensor working stability is 10mS, and it is 10S that dormancy period then can be set, and wake-up period is 20mS, like this, this wireless monitoring device can be worked more than 3 years.In the practical application,, determine not have accident to take place, also can enter dormancy period immediately if when wake-up period begins.
Certainly, make module be in off-position, also can not repeat them here being provided with by the CPU module between module and the power module accordingly or catching the metal-oxide-semiconductor switch that period controller is controlled to reduce the situation of power consumption for the working power of cutting off module.
Wireless monitoring device in the foregoing description two is identical with the structure of Fig. 2, does not repeat them here, and different with Fig. 2 is, the performed concrete function of transducer wherein and CPU module is different:
Transducer is used in the wake-up period that sets in advance thing to be collected being carried out real-time perception under the control of CPU module, obtains the simulation perceptual signal, exports filtration module to, stops perception in the dormancy period that sets in advance;
The CPU module is used for according to the wake-up period and the dormancy period that set in advance, and in wake-up period, the control transducer carries out real-time perception, and in dormancy period, the control transducer stops perception; Receive the triggering signal of comparator output, export first triggering signal to filtration module; Receive the digital sampled signal of A/D conversion module output, export wireless communication module to, and carry out timing, the sampling time that is provided with then, export second triggering signal to filtration module.
Below again the method for the realization long-distance wireless monitoring of the embodiment of the invention is described.
Fig. 3 realizes the method flow schematic diagram of long-distance wireless monitoring for the embodiment of the invention.Referring to Fig. 3, this flow process comprises:
In this step, have extremely low power dissipation or do not need working power to get final product the transducer of work for temperature sensor, velocity transducer, charge type vibrating sensor etc., can continue real-time perception and obtain the simulation perceptual signal, like this, the transducer real-time perception is obtained the simulation perceptual signal; And for thermocouple sensor, strain transducer, the transducer that power transducer etc. needs driving voltage usually or provides power supply to work, if with time of wireless monitoring device work as major consideration, promptly for the less demanding accident of some real-times, for example, for situations such as fire alarms, dormancy period is set to 10S, wake-up period is set to 20mS, if fire alarm takes place in dormancy period, by the time wake-up period then, transducer is started working, and perception fire alarm incident also sends relevant information by wireless mode, and is little for the influence that the staff of monitoring center in time takes measures.Thereby, can between power module of powering and transducer, switch be set, for example, the metal-oxide-semiconductor switch at dormancy period, turn-offs the metal-oxide-semiconductor switch, the power path between the module of cutting off the electricity supply and the transducer; At wake-up period, conducting metal-oxide-semiconductor switch, the power path between turn-on power module and the transducer promptly is provided with dormancy period and wake-up period, at dormancy period, stops perception; At wake-up period, carry out perception and obtain the step of simulation perceptual signal, to prolong the time of wireless monitoring device work, like this, transducer real-time perception in the wake-up period that sets in advance is obtained the simulation perceptual signal, stops perception in the dormancy period that sets in advance.
Step 302 is carried out filtering according to predefined filtering strategy to the simulation perceptual signal that obtains, if receive first triggering signal, execution in step 303 is if receive second triggering signal, execution in step 304;
In this step, the filtering strategy is determined according to the sensor acquisition object of configuration, for example, sensor acquisition object for configuration is the situation of earthquake, because therefore the concentration of energy of earthquake is in low-frequency range,, the filtering strategy just can be low-pass filtering, in order to the simulation perceptual signal beyond the low frequency is carried out filtering,, reduce the power consumption of wireless monitoring device to reduce the workload of follow-up comparison and calculating.
Step 303 is carried out the A/D conversion with the simulation perceptual signal of filtering, forms digital sampled signal, sends by wireless mode;
In this step, after forming digital sampled signal, can handle, obtain the relevant physical quantity of sampled signal according to the Processing Algorithm that sets in advance; Judge whether to be accident according to relevant physical quantity of sampled signal and the accident determination strategy that sets in advance, if be defined as accident, produce the 3rd triggering signal, improve the sample rate of A/D conversion module with control to the output of A/D conversion module, carry out timing simultaneously, the sampling time that is provided with then, generate and export second triggering signal.
Step 304 compares the simulation perceptual signal level value and the predefined level threshold of filtering, if simulation perceptual signal level value greater than predefined level threshold, execution in step 305, otherwise, do not deal with;
Step 305 generates and exports first triggering signal, carries out timing, the sampling time that is provided with then, generate and export second triggering signal.
In this step, the simulation perceptual signal that first triggering signal is used to control filtering carries out A/D conversion, processing and calculating, obtains the relevant physical quantity of sampled signal etc.; The simulation perceptual signal that second triggering signal is used to control filtering compares, to determine whether to need to carry out A/D conversion, processing and calculating.
First triggering signal, second triggering signal and the 3rd triggering signal are generated and output by the CPU module, the CPU module is after generating first triggering signal, each relevant portion with the wake on wireless monitoring device, the beginning image data is also handled, is analyzed and calculate, after generating the 3rd triggering signal, notice A/D conversion module improves sample rate and carries out continuous intensive collection, and sends by wireless mode; After generating second triggering signal, each relevant portion of wireless monitoring device is placed resting state.
Usually the transducer that needs driving voltage or provide power supply to work for thermocouple sensor etc., the CPU module can also be according to the wake-up period and the dormancy period that set in advance, and in wake-up period, the control transducer carries out real-time perception, in dormancy period, the control transducer stops perception.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a method that realizes long-distance wireless monitoring is characterized in that, this method comprises:
The transducer real-time perception is obtained the simulation perceptual signal;
Filtration module carries out filtering according to predefined filtering strategy to the simulation perceptual signal that obtains, when receiving first triggering signal, export the simulation perceptual signal that obtains to the A/D conversion module, when receiving second triggering signal or not receiving triggering signal, export the simulation perceptual signal that obtains to comparator;
The A/D conversion module carries out the A/D conversion with the simulation perceptual signal of filtering, forms digital sampled signal;
Comparator compares the simulation perceptual signal level value and the predefined level threshold of filtering, if simulation perceptual signal level value is greater than predefined level threshold, to CPU module output triggering signal;
The CPU module receives the triggering signal of comparator output, export first triggering signal to filtration module, receive the digital sampled signal of A/D conversion module output, send by wireless communication module, and carry out timing, the sampling time that is provided with then, generate and export second triggering signal to filtration module.
2. the method for claim 1 is characterized in that, the step of the digital sampled signal of described reception A/D conversion module output further comprises:
The CPU module is handled the digital sampled signal that receives according to the Processing Algorithm that sets in advance, obtain the relevant physical quantity of sampled signal,, carry out the described step that sends by wireless communication module if be defined as accident, otherwise, export second triggering signal to filtration module.
3. method as claimed in claim 2 is characterized in that, further comprises: if the CPU module is defined as accident, export the 3rd triggering signal to the A/D conversion module;
The A/D conversion module improves sample rate according in advance setting under the control of the 3rd triggering signal, the simulation perceptual signal of filtering is carried out the A/D conversion, forms digital sampled signal.
4. the method for claim 1 is characterized in that, the time and the monitoring application requirements that continue according to accident are provided with the described sampling time.
5. a method that realizes long-distance wireless monitoring is characterized in that, this method comprises:
Transducer real-time perception in the wake-up period that sets in advance is obtained the simulation perceptual signal, stops perception in the dormancy period that sets in advance;
Filtration module carries out filtering according to predefined filtering strategy to the simulation perceptual signal that obtains, when receiving first triggering signal, export the simulation perceptual signal that obtains to the A/D conversion module, when receiving second triggering signal or not receiving triggering signal, export the simulation perceptual signal that obtains to comparator;
The A/D conversion module carries out the A/D conversion with the simulation perceptual signal of filtering, forms digital sampled signal;
Comparator compares the simulation perceptual signal level value and the predefined level threshold of filtering, if simulation perceptual signal level value is greater than predefined level threshold, to CPU module output triggering signal;
The CPU module is according to the wake-up period and the dormancy period that set in advance, and in wake-up period, the control transducer carries out real-time perception, and in dormancy period, the control transducer stops perception; Receive the triggering signal of comparator output, export first triggering signal, receive the digital sampled signal of A/D conversion module output to filtration module, send by wireless communication module, and carry out timing, the sampling time that is provided with then, generate and export second triggering signal to filtration module.
6. a wireless monitoring device is characterized in that, this device comprises: transducer, filtration module, comparator, A/D conversion module, CPU module, wireless communication module and power module, wherein,
Transducer is used for thing to be collected is carried out perception, obtains the simulation perceptual signal, exports filtration module to;
Filtration module, be used for the simulation perceptual signal of transducer output is carried out filtering according to predefined filtering strategy, after receiving first triggering signal, export the simulation perceptual signal of filtering to the A/D conversion module, after receiving second triggering signal, export the simulation perceptual signal of filtering to comparator;
Comparator, the simulation perceptual signal of the module output that is used to accept filter compares with predefined level threshold, at simulation perceptual signal level value during greater than predefined level threshold, to CPU module output triggering signal;
The A/D conversion module is used for the simulation perceptual signal that receives is carried out the A/D conversion, forms digital sampled signal, exports the CPU module to;
The CPU module is used to receive the triggering signal that comparator is exported, and exports first triggering signal to filtration module; Receive the digital sampled signal of A/D conversion module output, export wireless communication module to, and carry out timing, the sampling time that is provided with then, export second triggering signal to filtration module;
Wireless communication module is used for the information of CPU module output is sent by wireless mode;
Power module is used to transducer, filtration module, comparator, A/D conversion module, CPU module and wireless communication module to provide work required operating voltage.
7. device as claimed in claim 6, it is characterized in that, described filtration module is high pass filter or band pass filter, described device further comprises: adder, be used for the simulation perceptual signal of transducer output is carried out add operation, the level value of simulation perceptual signal is drawn high predefined level value and exported filtration module to.
8. device as claimed in claim 7, it is characterized in that, described CPU module is further used for after the digital sampled signal that receives the output of A/D conversion module, according to the Processing Algorithm that sets in advance the digital sampled signal of input is handled, obtained the relevant physical quantity of sampled signal, judge whether to be accident, if be defined as accident, execution exports the flow process of wireless communication module to, otherwise, export second triggering signal to filtration module.
9. device as claimed in claim 8 is characterized in that, described CPU module is further used for after being defined as accident, exports the 3rd triggering signal to the A/D conversion module;
The A/D conversion module improves sample rate according in advance setting under the control of the 3rd triggering signal, the simulation perceptual signal of filtering is carried out the A/D conversion, forms digital sampled signal.
10. as each described device of claim 6 to 9, it is characterized in that, further comprise: digital adjustable potentiometer according to the level threshold parameter that the CPU module sets in advance, adjusts the output to the level threshold parameter corresponding voltage value of the level threshold of comparator for the setting of CPU module.
11. as each described device of claim 6 to 9, it is characterized in that, further comprise: catch period controller, be used to receive first triggering signal of CPU module output, wake A/D conversion module, CPU module and wireless communication module up and enter mode of operation, receive second triggering signal of CPU module output, A/D conversion module, CPU module and wireless communication module are placed resting state.
12. a wireless monitoring device is characterized in that, this device comprises: transducer, filtration module, comparator, A/D conversion module, CPU module, wireless communication module and power module, wherein,
Transducer is used in the wake-up period that sets in advance thing to be collected being carried out real-time perception under the control of CPU module, obtains the simulation perceptual signal, exports filtration module to, stops perception in the dormancy period that sets in advance;
Filtration module, be used for the simulation perceptual signal of transducer output is carried out filtering according to predefined filtering strategy, after receiving first triggering signal, export the simulation perceptual signal of filtering to the A/D conversion module, after receiving second triggering signal, export the simulation perceptual signal of filtering to comparator;
Comparator, the simulation perceptual signal of the module output that is used to accept filter compares with predefined level threshold, at simulation perceptual signal level value during greater than predefined level threshold, to CPU module output triggering signal;
The A/D conversion module is used for the simulation perceptual signal that receives is carried out the A/D conversion, forms digital sampled signal, exports the CPU module to;
The CPU module is used for according to the wake-up period and the dormancy period that set in advance, and in wake-up period, the control transducer carries out real-time perception, and in dormancy period, the control transducer stops perception; Receive the triggering signal of comparator output, export first triggering signal to filtration module; Receive the digital sampled signal of A/D conversion module output, export wireless communication module to, and carry out timing, the sampling time that is provided with then, export second triggering signal to filtration module;
Wireless communication module is used for the information of CPU module output is sent by wireless mode;
Power module is used to transducer, filtration module, comparator, A/D conversion module, CPU module and wireless communication module to provide work required operating voltage.
13. device as claimed in claim 12, it is characterized in that, further comprise the switch that is arranged between power module and the transducer, described CPU module is in wake-up period, switch between turn-on power module and the transducer carries out real-time perception with the control transducer, in dormancy period, the switch between power cutoff module and the transducer stops perception with the control transducer.
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