CN108931580A - The control method of sensor and sensor - Google Patents
The control method of sensor and sensor Download PDFInfo
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- CN108931580A CN108931580A CN201810408411.2A CN201810408411A CN108931580A CN 108931580 A CN108931580 A CN 108931580A CN 201810408411 A CN201810408411 A CN 201810408411A CN 108931580 A CN108931580 A CN 108931580A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
Abstract
The present invention provides the control method of a kind of sensor and sensor.Whens the oscillator of timing generates frequency departure etc., the detection timing of test section is possible to substantially deviate the regulation moment.Sensor has：Generate the clock generation unit of clock signal；In the test section of the timing detection physical quantity based on clock signal；And control unit, the control unit are adjusted the frequency for the clock signal that clock generation unit generates, so as to become smaller at the time of the clock signal based on clock generation unit generation with the difference of external reference instant.
Description
Technical field
The present invention relates to the control methods of sensor and sensor.
Background technique
The sensor device for having detecting part, communication unit, control unit and power supply unit is well known (referring for example to patent
Document 1).
Patent document 1：Japanese Patent Laid-Open 2015-111091 bulletin
Summary of the invention
Problem to be solved by the invention
In the detection timing for the making physical quantity sensor synchronous with reference instant, for determining that the timing of detection timing is used
Oscillator can generate frequency departure etc., be possible to substantially deviate reference instant so as to cause detection timing.In addition, due to leap second
Insertion etc., detection timing may also deviate reference instant.
Technical scheme applied to solve the technical problem
In mode one, sensor has：Generate the clock generation unit of clock signal；In the timing inspection based on clock signal
Survey the test section of physical quantity；And control unit, the control unit are adjusted the frequency for the clock signal that clock generation unit generates,
So that generated based on clock generation unit clock signal at the time of become smaller with the difference of reference instant of outside.
The difference of the reference instant obtained at the time of control unit can also be according to based on clock signal and from outside, come when adjusting
The frequency of clock signal, so as to become smaller at the time of being based on clock signal with the difference of reference instant.
In the case that control unit can postpone at the time of being based on clock signal than reference instant, the frequency of clock signal is improved
Rate.
Retardation at the time of based on clock signal relative to reference instant is bigger, and control unit can be by the frequency of clock signal
Rate raises higher.
In the case that control unit can shift to an earlier date at the time of being based on clock signal than reference instant, the frequency of clock signal is reduced
Rate.
Lead at the time of based on clock signal relative to reference instant is bigger, and control unit can be by the frequency of clock signal
Rate drops lower.
Test section can have：Generate the detector for indicating the analog signal of physical quantity；And it is determined in clock signal
Timing AD conversion portion that analog signal is AD converted.
AD conversion portion can be AD converted under the sample frequency higher than preset measurement frequency, and test section is also
Can have filtering part, which will be converted into the preset measurement frequency by digital signal obtained from AD conversion
The digital signal of rate.
Filtering part may include the decimation filter for making the frequency component decaying of the preset measurement frequency.
Clock generation unit can have：Generate the voltage-controlled oscillator with the clock signal of control voltage corresponding frequencies；
And according to based at the time of clock signal and the difference of reference instant come adjust control voltage voltage generating unit.
Control unit can obtain reference instant from outside, and make sensor at the time of presetting based on reference instant
Start to detect physical quantity, pass through the time according at the time of presetting with what is obtained based on clock signal progress timing, in generation
Portion's moment, and the frequency of clock signal is adjusted according to the difference of internal moment and reference instant, so that when internal moment and benchmark
The difference carved becomes smaller.
Control unit can reduce the frequency of clock signal in the case where that will be inserted into reference instant leap second.
In the case that control unit can insert leap second in reference instant, when being reduced in a period of entirely presetting
The frequency of clock signal, thus delay length corresponding with the leap second being inserted at the time of making based on clock signal.
Control unit can be advanced by pre- in the case where receiving the notice of leap second to be inserted at the time of from than being inserted into leap second
In a period of what is started at the time of during first setting entirely presets, the frequency of clock signal is reduced, thus when making to be based on
Delay length corresponding with the leap second being inserted at the time of clock signal.
Control unit can will indicate to be examined in a period of reducing the frequency of clock signal because being inserted into leap second by test section
The data for the physical quantity measured, and indicate it is data this information detected in a period of reducing the frequency of clock signal
It is corresponded to and is exported.
Sensor can be set in structural body, in the acceleration of detection structure body, tilt angle, speed and displacement
At least one of.
In mode two, the control method of sensor has：Generate the stage of clock signal；In the timing based on clock signal
Detect the stage of physical quantity；And it is adjusted according to based on the difference of the reference instant got at the time of clock signal and from outside
The frequency of clock signal, so that at the time of based on clock signal and stage that the difference of reference instant becomes smaller.
The summary of foregoing invention is not enumerating to all features of the invention.The deformation of these feature groups can also be with structure
At invention.
Detailed description of the invention
Fig. 1 shows the Sketchs of the monitoring system 100 of an embodiment.
Fig. 2 briefly indicates the functional structure of sensor 40a.
Fig. 3 illustrates that an example of the time series of the sampling timing of sensor 40.
Fig. 4 illustrates that an example of the time series of the sampling timing of sensor 40a.
Fig. 5 indicates the flow chart of the movement of sensor 40a.
Fig. 6 indicates the sampling timing of the sensor 40 in the case where handling leap second.
Fig. 7 indicates the flow chart comprising processing relevant to leap second.
Specific embodiment
In the following, by the embodiment of invention, the present invention will be described, but the following embodiments and the accompanying drawings is not to right
The restriction that invention carries out involved in claim.In addition, the combination of the feature illustrated in embodiment and be not all solve this hair
Necessary to the technological means of bright technical problem.
Fig. 1 shows the Sketchs of the monitoring system 100 of an embodiment.Monitoring system 100 has structural body 80, structure
Body 81, data gathering system 10, data gathering system 11 and server 70.The monitoring of monitoring system 100 and structural body 80 and structure
The relevant physical quantity of body 81.The monitoring system 100 of present embodiment is structural body health monitoring system.For example, monitoring system 100
Physical quantity relevant to structural body 80 and structural body 81 is monitored, structural body 80 and the respective structural behaviour of structural body 81 are examined
It is disconnected.
Structural body 80 and structural body 81 can be engineering structure.Structural body 80 and structural body 81 may include for example building
Object, tunnel, road, guardrail, traffic lights, electric pole, headlamp, approach tower, aerodrome light beacon, station, rail, railway signal
Lamp, portal crane, factory, steel bridge, dam, dyke, door, wall, irrigation canals and ditches etc..Structural body 80 and structural body 81 also may include work
The earthwork structural bodies such as object, embankment, slope, river levee other than journey structure.
The physical quantity of 10 collection structure body 80 of data gathering system.Data gathering system 10 has sensor 40a, sensor
40b, sensor 40c, sensor 40d, collection device 20, notice device 30, relay 50 and communication line 60.This embodiment party
In formula, sensor 40a, sensor 40b, sensor 40c and sensor 40d are referred to as sensor 40 sometimes.
Sensor 40 is arranged on structural body 80.Sensor 40 is acceleration transducer.40 detection structure body 80 of sensor
Vibration acceleration when because of the vibration such as earthquake, wind.The gradient etc. of the also detection structure body 80 of sensor 40.Sensor 40 passes through
Detection acceleration of gravity carrys out the gradient etc. of detection structure body 80.It is to have the case where building of multiple floors in structural body 80
Under, mutually different floor in building can be set in sensor 40.At least part of sensor 40 can also be arranged
In the same floor of building.At least part of sensor 40 can also be set on the ground that structural body 80 is fixed.
Acceleration is an example of the physical quantity that sensor 40 detects.The physical quantity detected as sensor 40 may be exemplified as inclination
Angle, speed, displacement etc..
Sensor 40 is connected to collection device 20 by communication line 60.Specifically, sensor 40 passes through communication line
60 and relay 50 be connected to collection device 20.Collection device 20 is connected to notice device 30.Communication line 60 is computer
Communication line in network.In present embodiment, communication line 60 is the communication line of Ethernet (registered trademark).
Indicate that the data for the acceleration that sensor 40 detects are sent to collection device 20 by communication line 60.Collect dress
20 pairs are set to handle from the data that sensor 40 is collected into.Collection device 20 is based on the data being collected into, to structural body 80
Shaking is analyzed, and by analysis result by notifying device 30 to notify.For example, collection device 20 is based on structural body 80
It shakes, is determined with that there is no earthquakes.What collection device 20 can be detected based on the sensor 40 for being set to multiple floors adds
Speed determines the earthquake degree of each layer in multiple floors.Collection device 20 can be with the relative storey displacement of decision structure body 80.Collection device
20 sizes that can be shaken based on each layer of structural body 80, to determine the extent of damage of each layer.Collection device 20 can be by logical
Know that the notice of device 30 determines result.
The data that collection device 20 is collected into are sent to server 70.Collection device 20 can will be in the data that be collected into
A part of data are sent to server 90 by relay 50 and network 90.Collection device 20 can interval in time
The data being collected into are sent to server 70.Server 70 is based on the data received from collection device 20, to structural body 80
Structure analyzed.For example, server 70 is based on the data received from collection device 20, it is long-term to the structure of structural body 80
It is analyzed.For example, the data of the construction of structural body 80 at that time are compared with current data, therefore, it is determined that structural body 80
Degree of safety.Server 70 can measure the deformation extent of structural body 80, therefore, it is determined that the emergency danger level of structural body 80.Server
The 70 judgement results generated are sent to notice device 30, and are notified from notice device 30.
Data gathering system 11 in structural body 81 has function identical with the function of data gathering system 10.Data are received
Collecting system 11 analyze simultaneously notification analysis result as data gathering system 10, to the shaking of structural body 81.Server 70
Based on the data received from data gathering system 11, the structure of structural body 81 is analyzed for a long time, and notification analysis result.
Data gathering system 11 has constituent element identical with the constituent element that data gathering system 10 has.Therefore, data are received
The constituent element illustration omitted of collecting system 11.Also omit illustrating for the constituent element having to data gathering system 11.
Collection device 20 has clocking capability.Collection device 20 makes inside moment obtained using clocking capability measurement and outer
The reference instant in portion is consistent.For example, external reference instant is by network 90 by external NTP (Network Time
Protocol：Network Time Protocol) server etc. provides.At the time of collection device 20 can make internal moment and ntp server
It is synchronous.
Sensor 40 has clocking capability.Sensor 40 makes the system time obtained using the clocking capability timing and outside
Reference instant it is consistent.External reference instant can be provided by collection device 20.Specifically, sensor 40 makes system time
It is consistent with external reference instant, so that the difference of system time and reference instant is in preset error range.For example, passing
Sensor 40 is based on the delay time communicated from the reference instant and communication line 60 that collection device 20 receives, when adjusting system
It carves.
The not only management system moment of sensor 40 also manages the inside moment for determining the measurement moment of acceleration.Example
Such as, sensor 40 is internal at the time of each presets according to the clock signal for determining the measurement frequency of acceleration
Portion's moment carries out timing, to update the internal moment.Sensor 40 detects acceleration according to the clock signal.Sensor 40 will
Sensor signal including data and the data at expression internal moment comprising the acceleration for indicating to detect, passes through communication
Route 60 is sent to collection device 20.
Sensor 40 improves the survey for determining acceleration in the case where detecting that the internal moment is than reference instant delay
Determine the frequency of the clock signal of frequency.Sensor 40 is reduced and is used in the case where detecting that the internal moment shifts to an earlier date than reference instant
In the frequency of the clock signal for the measurement frequency for determining acceleration.To in the feelings that the difference at internal moment and reference instant becomes larger
Under condition, the difference of internal moment and reference instant can be reduced, and can continue to measure acceleration under substantially stationary frequency.Cause
And be able to suppress data has missing in time.In addition, passing through sensor 40 since the regulation moment based on reference instant
Detection operation, can defined detection moment detect acceleration.In addition, can make each sensor 40 detect acceleration when
It carves consistent.To which, collection device 20 for example can be based on the acceleration of each layer of synchronization structural body 80, correctly decision structure
The shaking of body 80.
As described above, system time is synchronous with reference instant in sensor 40.Therefore, sensor 40 can detect
In the case that the internal moment postpones than system time, the frequency for determining the clock signal of the measurement frequency of acceleration is improved.
In addition, sensor 40 can be reduced in the case where detecting that the internal moment shifts to an earlier date than system time for determining acceleration
Measure the frequency of the clock signal of frequency.
Fig. 2 briefly indicates the functional structure of sensor 40a.Sensor 40a has control unit 200, memory 210, surveys
Determine portion 230, communication unit 290 and clock generation unit 250.
Illustrate the functional structure of sensor 40a referring to Fig. 2, but sensor 40b, sensor 40c, sensor 40d have
Structure identical with sensor 40a.Therefore, it omits and sensor 40b, sensor 40c and sensor 40d is illustrated.
Control unit 200 controls entire sensor 40a.Control unit 200 can be processor.Memory 210 is that volatibility is deposited
Reservoir or nonvolatile memory.Control unit 200 carries out each portion of sensor 40a using the information stored in memory 210
Control.
Determination part 230 detects acceleration.Clock generation unit 250 is generated for determining that determination part 230 detects determining for acceleration
When clock signal.The clock signal of different frequency can be generated in clock generation unit 250.Clock generation unit 250 is variable frequency
Oscillator.Determination part 230 detects acceleration in the timing based on clock signal.
The frequency of the adjustable clock signal of control unit 200, so that the clock signal based on the generation of clock generation unit 250
The difference of the reference instant of moment and outside becomes smaller.Specifically, control unit 200 according to based on clock generation unit 250 generate when
The difference of the reference instant got at the time of clock signal and from outside, the frequency for the clock signal that adjustment clock generation unit 250 generates
Rate, so as to become smaller at the time of being based on clock signal with the difference of reference instant.
In the case that control unit 200 postpones at the time of being based on clock signal than reference instant, the frequency of clock signal is improved
Rate.Specifically, in the case that retardation of the control unit 200 based on clock signal at the time of relative to reference instant is bigger,
The frequency of clock signal is raised higher.
In the case that control unit 200 shifts to an earlier date at the time of being based on clock signal than reference instant, the frequency of clock signal is reduced
Rate.Specifically, in the case that lead of the control unit 200 based on clock signal at the time of relative to reference instant is bigger,
The frequency of clock signal is dropped lower.
In the case that control unit 200 can be inserted into leap second in reference instant, the frequency of clock signal is reduced.For example, control
In the case that portion 200 processed can insert leap second in reference instant, clock signal is reduced during preset entire
Frequency, thus delay corresponding with the leap second being inserted into length at the time of making based on clock signal.It shakes for example, being controlled in voltage
It, will during 10000 seconds when inserting 1 second leap second in the case where swinging the changeable frequency range of device 280 for ± 100ppm
The frequency of voltage-controlled oscillator 280 is set as minimum.Thus, it is possible to keep internal moment and reference instant real after 10000 seconds
Matter is synchronous.In addition, control unit 200 can be in the case where being informed about leap second to be inserted into, from than mentioning at the time of insertion leap second
It is preceding preset during at the time of, in a period of entirely presetting, reducing clock signal after the moment
Frequency, thus delay corresponding with the leap second being inserted into length at the time of making based on clock signal.
Determination part 230 has detector 220 and AD converter 240.AD converter 240 has AD conversion portion 242 and filtering
Portion 244.Detector 220 generates the analog signal for indicating acceleration.Detector 220 can be 3-axis acceleration sensor.
Detector 220 has detection means 222, simulation process portion 224 and LPF226.Detector 220 is that MEMS type accelerates
Spend sensor.Detection means 222 can have the MEMS device being integrated on silicon substrate, glass substrate, organic material etc..Detection
Component 222 has the movable electrode that can be subjected to displacement by acceleration, output and the displacement according to movable electrode and become
The corresponding analog signal of the electrostatic capacitance of change.
The analog signal exported from detection means 222 is provided to simulation process portion 224.The simulation of 224 pairs of simulation process portion
Signal amplifies the preset processing such as processing.LPF226 is low-pass filter.LPF226 makes high fdrequency component substantially
It reduces, pass through low frequency.For example, measure frequency be 100Hz in the case where, LPF226 preferably have make 100Hz with
On frequency component reduce frequency characteristic.The analog signal of LPF226 output is defeated as the analog signal for carrying out self-detector 220
Out to AD converter 240.
AD converter 240 carries out analog signal provided by detector 220 to be sampled and transformed into digital signal, then defeated
Control unit 200 is arrived out.It is acted specifically, AD converter 240 is based on clock signal provided by clock generation unit 250.
More specifically, AD conversion portion 242 is AD converted analog signal in the timing determined by clock signal.AD conversion portion
242 are AD converted with the sample frequency for being higher than preset measurement frequency.For example, clock generation unit 250 is to AD converter
240 provide the clock signal that frequency is higher than the measurement frequency.
For example, AD conversion portion carries out the AD conversion of Δ Σ (Delta-Sigma) mode.Filtering part 244 will pass through AD conversion
The digital signal obtained afterwards is converted into the digital signal of the measurement frequency.Filtering part 244 may include the frequency for making to measure frequency
The decimation filter of rate component decaying.In the case where the measurement frequency is 100Hz, filtering part 244 can be near 100Hz
With attenuation peak.Filtering part 244 can be set in the outside of AD converter 240.
Clock generation unit 250 has control voltage generating unit 260, voltage-controlled oscillator 280 and frequency divider 270.Voltage
Control the clock signal that oscillator 280 generates with controls voltage corresponding frequencies.It is supplied to the control electricity of voltage-controlled oscillator 280
Pressure is provided by control voltage generating unit 260.Control voltage generating unit 260 is believed according to the clock generated based on clock generation unit 250
Number at the time of and reference instant difference generate control voltage.Control voltage generating unit 260 function can also by control unit 200
Have.
The clock signal that voltage-controlled oscillator 280 generates is provided to frequency divider 270.Frequency divider 270 is to preset
Frequency dividing ratio provided clock signal is divided, and be supplied to control unit 200.Control unit 200 is based on 270 institute of frequency divider
The fractional frequency signal of the clock signal of offer, to timing is carried out constantly, so that it is determined that for determining that sensor 40 measures acceleration
The inside moment at moment.
Control unit 200 makes sensor start to examine at the time of presetting based on the reference instant got from outside
Measuring acceleration.Specifically, control unit 200 at the time of being preset based on reference instant, is made to the output of AD converter 240
Its commencing signal for starting AD conversion.Control unit 200 is according to the warp obtained at the time of presetting and based on clock signal timing
The time is spent, the internal moment is generated.Specifically, control unit 200 is believed based on the frequency dividing of the clock signal provided from frequency divider 270
Number, timing is carried out to by the time.Control unit 200 is based on the difference at internal moment and reference instant, adjusts the frequency of clock signal,
So that the difference of internal moment and reference instant becomes smaller.For example, control unit 200 makes to control the generation of voltage generating unit 260 based on inside
The control voltage of the size of the difference of moment and reference instant.Specifically, control unit 200 postpones at the internal moment than reference instant
In the case where, in order to improve the frequency of clock signal, increase control voltage.In addition, comparing benchmark at the internal moment in control unit 200
In the case that moment shifts to an earlier date, in order to reduce the frequency of clock signal, reduce control voltage.Thus, can in determination part 230
Continue periodically to measure, and preset measurement moment and sampling timing under reference instant can be controlled and reach one
It causes.
The detection data that digital signal provided by AD converter 240 indicates is stored in memory 210 by control unit 200.
Control unit 200 generates the acceleration information for indicating acceleration value to the predetermined processing of detection data.Control unit 200
Using the inside moment of the clock signal generated based on clock generation unit 250 as detection moment.Control unit 200 is generated comprising accelerating
Sensing data at the time of degree evidence and expression detection moment including data.Sensing data is the data for indicating acceleration
One example.
It is above-mentioned reduce the frequency of clock signal because of the insertion of leap second in the case where, control unit 200 can will drop
The detection data detected in a period of the low frequency of clock signal by determination part 230 is to reduce clock letter with expression
Number frequency in a period of data this information for detecting corresponded to and exported.For example, control unit 200 can be to each acceleration
Degree is according to the additional label for indicating whether or not there is leap second adjustment.
Communication unit 290 is responsible for being communicated between collection device 20 via communication line 60.Communication unit 290 will control
The sensing data that portion 200 generates is output to communication line 60.Communication unit 290 can detect acceleration whenever sensor 40
When, collection device 20 is sent for sensing data by communication line 60.Communication unit 290 will be received by communication line 60
Data be supplied to control unit 200.Can have such as the data for indicating reference instant as data are received.
Fig. 3 illustrates that an example of the time series of the sampling timing of sensor 40.In order to be readily appreciated that sequence
It is illustrated, markers shown in the time series of Fig. 4 is different from the markers of real time sequence.
Here, it is specified that sensor 40 when 00 divide 0 second every 10ms timing measure acceleration.Such case
Under, measurement frequency specified in sensor 40 is 100Hz.Control unit 200 0 divides 0 second 0 millisecond determines when becoming 0 at the internal moment
When, the commencing signal of AD conversion is supplied to AD conversion portion 242.
According to the specification of AD converter 240 and voltage-controlled oscillator 280, following regulation is made：It shakes being controlled to voltage
In the case where swinging the control voltage that device 280 provides V0, the output data rate of 100Hz can be obtained from AD converter 240.Control
The control signal for being used to make to control the output control of voltage generating unit 260 voltage V0 is output to control voltage generating unit by portion 200 processed
260。
Regulation of the AD converter 240 including it have passed through the internal delay time comprising AD conversion portion 242 and filtering part 244
Settling time after, with the clock signal synchronization that is supplied to AD converter 240, to be substantially the cycle T every 10ms,
Export detection data 1,2,3 ....Control unit 200 measures the internal moment based on the fractional frequency signal from frequency divider 270.Here
To simplify the explanation, it is set as when detecting start time 00 00 at the time of divide after 0 second 0 millisecond of 10ms：00：00.010 obtains
First detection data 1.Later, at the moment 00：00：00.020 obtains detection data 2, at the moment 00：00：00.030 is examined
Measured data 3.
After obtaining detection data i in the state of will control voltage and maintain V0, when receiving benchmark from collection device 20
Carve 00：00：20.050.Reference instant is used as at the time of reference instant and considers receipts for what is notified from collection device 20
Communication delay between acquisition means 20 and sensor 40 simultaneously carries out the revised moment.At this point, when the inside of sensor 40
Carve is 00：00：20.005.I.e., it is known that be the state for the internal moment 45ms being delayed than reference instant.In this case, it controls
The control voltage V that portion 200 makes to be sent to voltage-controlled oscillator 280 increases, the amount and reference instant of increase and inside moment it
Poor 45ms is corresponding.In the time series of Fig. 3, control unit 200 makes control voltage increase to V1 from V0.To raw from clock
It shortens at the period of the clock signal in portion 250.The timing at 200 pairs of control unit internal moment is accelerated as a result,.
After obtaining detection data i, at the internal moment 00：00：20.010 obtain detection data i+1, at the internal moment
00：00：20.020 obtain detection data i+2, at the internal moment 00：00：20.030 obtaining detection data i+3.In control voltage
After reaching V1, every the cycle T 1 shorter than 10ms, detection data i+1, detection data i+2, detection data i+ are obtained
3……。
In the state of controlling voltage maintenance V1, substantially every cycle T 1, at the internal moment 00：00：30.000 obtain
Detection data j, at the internal moment 00：00：After 30.010 obtain detection data j+1, reference instant 00 is received from collection device 20：
00：30.017.The inside moment of sensor 40 at this time is 00：00：30.015.I.e., it is known that be to compare reference instant at the internal moment
Also delay the state of 2ms.In this case, control unit 200 makes control voltage further increase V1 '.To come from clock
The period of the clock signal of generating unit 250 further shortens.The timing at 200 pairs of control unit internal moment is further speeded up as a result,.
After control voltage reaches V1 ', substantially every the cycle T of 10ms, detection data j+2, detection data j+ are obtained
3…….For example, if by the goal-setting of internal moment and the time difference of reference instant be ± 1ms within, reach target with
Repeat above-mentioned movement before interior.
Fig. 4 illustrates that an example of the time series of the sampling timing of sensor 40a.Fig. 4 indicates to be examined in Fig. 3
Time series after measured data j+3.Here, after obtaining detection data j+3, control voltage is set to maintain V0.
After obtaining detection data j+3, substantially every the cycle T of 10ms, at the internal moment 00：00：40.000
Detection data k is obtained, at the internal moment 00：00：40.010 obtain detection data k+1, at the internal moment 00：00：40.020
To detection data k+3.
After obtaining detection data k+2 in the state of will control voltage and maintain V0, benchmark is received from collection device 20
Moment 00：00：39.080.At this point, the inside moment of sensor 40a is 00：00：40.025.I.e., it is known that be to compare base at the internal moment
Punctual carve is advanced by the state of 45ms.In this case, control unit 200 makes control voltage be reduced to V2.To raw from clock
Period at the clock signal in portion 250 is elongated.The timing at 200 pairs of control unit internal moment slows down as a result,.Reach in control voltage
After V2, substantially every the cycle T 2 longer than cycle T, detection data k+3, detection data k+4, detection data k+ are obtained
5……。
In the state of controlling voltage maintenance V2, at the internal moment 00：00：50.00 obtain detection data m, when internal
Carve 00：00：After 50.010 obtain detection data m+1, reference instant 00 is received from collection device 20：00：50.013.Biography at this time
The inside moment of sensor 40a is 00：00：50.015.I.e., it is known that be the internal moment state of 2ms to be also advanced by than reference instant.
In this case, control unit 200 makes control voltage be further reduced to V2 '.To the clock letter from clock generation unit 250
Number period be further elongated.Thus, the timing at 200 pairs of control unit internal moment further slows down.Reach V2 ' in control voltage
Later, substantially every the cycle T of 10ms, obtain detection data m+2, detection data m+3 ....For example, if will be internal when
Carving with the goal-setting of the time difference of reference instant is then to repeat before reaching within target above-mentioned dynamic within ± 1ms
Make.
As shown in Figure 4 and Figure 5, control unit 200 has been more than to preset than the time that reference instant postpones at the internal moment
Time in the case where, will control voltage increase to more than specified value V0, to improve the frequency of clock signal.When improving
After the frequency of clock signal, when the difference of internal moment and reference instant is less than the preset time, control voltage is fixed
In its voltage value.Control unit 200 is the case where it has been more than the preset time that the internal moment is than the time that reference instant shifts to an earlier date
Under, reduce the frequency of clock signal.After reducing the frequency of clock signal, when the difference at internal moment and reference instant is less than
When the preset time, control voltage is fixed on its voltage value.
Referring to Fig. 3 and Fig. 4, in order to be easy to understand explanation, when to realizing in the error range more than millisecond with benchmark
Synchronous situation is carved to be illustrated.But it can also be realized in the error range for being less than millisecond synchronous with reference instant.In addition,
Referring to Fig. 3 and Fig. 4, the method that the internal moment is determined when obtaining reference instant is illustrated.But it can also use and pass
In the case that the system time of sensor 40 is synchronous with reference instant, the inside moment of measurement is compared with system time
Mode.
Fig. 5 indicates the flow chart of the movement of sensor 40a.Processing in the flow chart of Fig. 5 is mainly in control unit 200
It is acted under control by each portion of sensor 40a to execute.
In the S500 of Fig. 5, control unit 200 keeps the internal moment synchronous with reference instant.Specifically, from collection device 20
In the case where receiving reference instant, the time required for the communication between collection device 20 and sensor 40a is taken into account,
Keep the internal moment synchronous with reference instant.
In the S502 of Fig. 5, control unit 200 judged whether to measurement start time.Control unit 200 judges that the internal moment is
It is no consistent with preset measurement start time.In the case where the internal moment does not arrive measurement start time, control unit
The arrival of the start times to be determined such as 200.In the case where having arrived measurement start time, in S504, control unit 200 is to AD conversion
Portion 242 exports AD conversion commencing signal, and clock generation unit 250 is made to start to provide clock signal to AD conversion portion 242.
In the S506 of Fig. 5, the event occurred is judged.As event, has from filtering part 244 and get testing number
The detection data that is occurred in the case where obtains event, get reference instant from collection device 20 in the case where occurred
Reference instant obtains event and measurement End Event.
It is judged as that in the case where detection data acquisition event has occurred, in S510, control unit 200 is right in the S506 of Fig. 5
The predetermined data processing of detection data generates sensing data.Then, in S512, control unit 200 makes communication unit
290 send sensing data.After the processing of S512 is completed, S506 is returned.
In the S506 of Fig. 5, control unit 200 judges whether the internal moment relative to the retardation of reference instant has been more than threshold value
Tth.In the case where being more than threshold value Tth relative to the retardation of reference instant at the internal moment, in S522, control unit 200
Increase the control voltage for being supplied to voltage-controlled oscillator 280, then returns to S506.
In the case that the moment internal in the S520 of Fig. 5 is not above threshold value Tth relative to the retardation of reference instant,
In S524, control unit 200 judges whether the internal moment relative to the lead of reference instant has been more than threshold value Tth.When internal
It carves in the case where being more than threshold value Tth relative to the lead of reference instant, in S526, control unit 200 makes to be supplied to voltage
The control voltage for controlling oscillator 280 reduces, and then returns to S506.
When be judged as in the S506 in Fig. 5 have occurred measurement End Event when, terminate the processing of this flow chart.Measurement terminates
Event is in the case where receiving from collection device indicates the instruction for terminating to measure this meaning or operates measurement end switch
In the case where occur.
Fig. 6 indicates the sampling timing of the sensor 40 in the case where handling leap second.In Fig. 6, in order to make to act sequence
Column are readily appreciated that be illustrated, and markers is presented by the way of different from the markers of actual time series.Fig. 6 show by
It is notified of sampling timing when following situation：According to the leap second indicator received from ntp server etc., at 8,59 divide 59 seconds
It is inserted into 1 second leap second " 59 divide 60 seconds when 8 " later.
For example, control unit 200 makes in the case where the changeable frequency range of voltage-controlled oscillator 280 is ± 100ppm
The period of clock signal before 10000 seconds at the time of being inserted into leap second of internal moment 10000 seconds during extend
100 microseconds.To which the timing after inserting leap second makes inside moment and reference instant based on clock signal realize essence
On it is consistent.Specifically, at 6 13 divide 20 seconds after 10000 seconds during in (=2 hours 46 points 40 seconds during), reduce
It is supplied to the control voltage V of voltage-controlled oscillator 280, makes the period T ' of clock signal.Here, T '=T+0.0001.From
And determination part 230 is with cycle T ' continue the sampling of acceleration.The period of clock signal is maintained at T ' by 200 pairs of control unit
In a period of acquired data addition indicate that the leap second of " having leap second adjustment " adjusts label.Thus, it is possible to when distinguishing with benchmark
Quarter achieves synchronous data and the data under leap second adjustment state.
As a result, at the 8 of reference instant 59 divide after 59 seconds after inserting leap second reference instant 9 when 0 divide 0 second, it is internal
Moment and reference instant reach substantial consistent.In addition, can be obtained in during including the timing for containing leap second insertion
Take the data continuous in time that the measurement period is substantially stationary.
In the case where no progress above-mentioned processing corresponding with leap second, when from sensor output from 8 59 divide 59 seconds to 9 when
Data in 0 point of 1 second of 0 second, but when from 8 59 divide 60 seconds to 9 when 01 second for dividing 0 second in data lack sometimes.However, such as
Shown in Fig. 6, by adjusting the period of clock signal before being inserted into leap second, without carrying out special data manipulation to leap second, just
Continuous data in time can be generated.
It in Fig. 6, illustrates in the case where leap second will be inserted by having prenoticed, reduces clock signal before being inserted into leap second
Frequency processing.But in the case where not prenoticing leap second to be inserted into, when control unit 200 detects to insert in reference instant
When having entered the leap second of " 60 seconds ", 100 microsecond of cycle stretch-out of clock signal can also be made in a period of 10000 seconds.To energy
Enough timings after 10000 seconds, make the internal moment realize the consistent of substance with reference instant.
Fig. 7 indicates the flow chart comprising processing relevant to leap second.Fig. 7 indicates later dynamic of S506 in the flow chart of Fig. 5
Make.The flow chart of Fig. 7 and Fig. 5 is the difference is that the processing comprising S540 and S542.Here, mainly with the process with Fig. 5
The difference of figure is illustrated, and omits other explanations.
In the flow chart of Fig. 7, the event judged in S506 further includes leap second other than the event referring to illustrated by Fig. 5
It is inserted into notification event and leap second handles event.Leap second notification event is inserted into refer to according to from the leap second that ntp server etc. receives
Show symbol and prenoticed to be inserted into leap second in the case where occur.Leap second processing event inserts intercalation in detecting reference instant
Occur in the case where second or to start and carry out the predetermined instant of clock frequency adjustment for leap second.
It is judged as that in S540, control unit 200 is set as in the case where leap second insertion notification event has occurred in S506
Occur leap second to handle event before being inserted into 10000 seconds of moment leap second.It before 10000 seconds of insertion moment leap second is started for leap second
Carry out the predetermined instant of clock frequency modulation.
It is judged as that in the case where leap second processing event has occurred, in S542, control unit 200 was at 10000 seconds in S506
During reduce and be supplied to the control voltage of voltage-controlled oscillator 280, keep the period of clock signal elongated.Thus, it is possible to send out
Continuous data in time are sent, without making shortage of data at the time of being inserted into leap second.
About the processing of leap second, mainly illustrates the case where being inserted into positive leap second and be illustrated.In insertion negative leap second
In the case of, with insertion on the contrary, improving the frequency of clock signal the case where positive leap second.
Data gathering system 10 from the description above, each sensor 40 is according to the retardation relative to reference instant or mentions
Preceding amount to not only can be carried out the measurement of sensor 40, but also can make inside to adjust the clock signal for being supplied to AD conversion portion 242
Moment is synchronous with reference instant.Therefore, being able to suppress each sensor 40 makes to measure for clock synchronization temporarily interruption or setting survey
Fixed interval or measuring interval become extremely short.
In addition, according to data gathering system 10, sensor 40 by adjusting AD conversion portion 242 conversion timing, when realization
It carves and synchronizes.Therefore, it compared with the case where fixed crystal oscillator of frequency of use etc. is to generate clock signal, is able to suppress because of frequency
Become larger caused by the accumulation of rate error with the deviation of reference instant.
In order to make measure the moment it is synchronous with reference instant, it is also contemplated that with reference instant synchronously by control unit 200 with
Cycle T seriatim provides the mode of the commencing signal of AD conversion to AD conversion portion 242.But filtering part 244 is in order to remove because of week
The sampling of phase T and the foldback signal generated, need the settling time of substantially time T.Therefore, AD conversion portion 242 and filter can be made
Wave portion 244 reaches cycle T or more at whole settling time.This mode can not thus be used.
In contrast, according to sensor 40, after AD conversion portion 242 starts movement, sensor 40 to conversion timing into
The continuous fine tuning of row, to realize the synchronization at moment.Therefore, the letter after sufficiently eliminating foldback signal can be continuously available
Number.Thereby, it is possible to make the variation of the offset output of sensor 40 become smaller, therefore it can accurately measure tilt angle.
In monitoring system 100, the detection timing of the acceleration of 10 detection structure body 80 of data gathering system can be with number
According to the detection Timing Synchronization of the acceleration of 11 detection structure body 81 of collection system.For example, data gathering system 11 can be in data
The synchronization at the time of acceleration of 10 detection structure body 80 of collection system, the acceleration of detection structure body 81.
In addition, illustrating that 1 structural body 80 is equipped with the mode of 1 monitoring system 100 in monitoring system 100.But it can also be with
For multiple structural bodies, 1 monitoring system 100 is set.
The test object of sensor 40 is not limited to acceleration.Sensor 40 also can detecte magnetic field, electric field, light, radiation
The various physical quantitys such as line.The quantity for the sensor 40 that 1 data gathering system 10 has is not limited to 4, have 2 or more i.e.
It can.
More than, using embodiment, the present invention is described, but technical scope of the invention is not limited to above-mentioned reality
Apply range documented by mode.It will be appreciated that can above embodiment be made various changes or be improved.Into
The mode after such changes and modifications of having gone is also included in the technical scope of the present invention, and can be from claims
It records and understands.
It should be noted that in device, system, program and method shown in claims, the description and the appended drawings
Execution that movement, sequence, step, stage etc. are respectively handled sequence as long as no particularly clearly show " before ", " previous " etc., or
In the case where the output of processing of the person before processing later will use, it can realize in any order.Right is wanted
Seek book, in the motion flow in the description and the appended drawings, for convenience of explanation, used " first ", " then " etc., but be not intended to
Have to implement in this order.
Label declaration
10 data gathering systems
11 data gathering systems
20 collection devices
30 notice devices
40 sensors
50 relays
60 communication lines
70 servers
80 structural bodies
81 structural bodies
90 networks
100 monitoring systems
200 control units
210 memories
220 detectors
222 detection means
224 simulation process portions
226 LPF
230 determination parts
240 AD converters
242 AD conversion portions
244 filtering part
250 clock generation units
260 control voltage generating units
270 frequency dividers
280 voltage-controlled oscillators
290 communication units
Claims (17)
1. a kind of sensor, which is characterized in that including：
Clock generation unit, the clock generation unit generate clock signal；
Test section, the test section detect physical quantity in the timing based on the clock signal；And
Control unit, the control unit are adjusted the frequency for the clock signal that the clock generation unit generates, so that based on described
Become smaller at the time of the clock signal that clock generation unit generates with the difference of external reference instant.
2. sensor as described in claim 1, which is characterized in that
The difference of the reference instant got at the time of the control unit is according to based on the clock signal and from outside, to adjust
The frequency of the whole clock signal, so as to become smaller at the time of being based on the clock signal with the difference of the reference instant.
3. sensor as claimed in claim 1 or 2, which is characterized in that
In the case that the control unit postpones at the time of being based on the clock signal than the reference instant, the clock is improved
The frequency of signal.
4. sensor as claimed in claim 3, which is characterized in that
Retardation at the time of based on the clock signal relative to the reference instant is bigger, and the control unit is by the clock
The frequency of signal raises higher.
5. such as described in any item sensors of Claims 1-4, which is characterized in that
In the case that the control unit shifts to an earlier date at the time of being based on the clock signal than the reference instant, the clock is reduced
The frequency of signal.
6. sensor as claimed in claim 5, which is characterized in that
Lead at the time of based on the clock signal relative to the reference instant is bigger, and the control unit is by the clock
The frequency of signal drops lower.
7. such as described in any item sensors of claim 1 to 6, which is characterized in that
The test section includes：
Detector, the detector maturation indicate the analog signal of the physical quantity；And
AD conversion portion, the AD conversion portion are AD converted the analog signal in the timing determined by the clock signal.
8. sensor as claimed in claim 7, which is characterized in that
The AD conversion portion carries out the AD conversion with the sample frequency for being higher than preset measurement frequency,
The test section further includes：
Filtering part, the filtering part believe the number for being converted into the measurement frequency by digital signal obtained from the AD conversion
Number.
9. sensor as claimed in claim 8, which is characterized in that
The filtering part includes the decimation filter for making the frequency component decaying of the measurement frequency.
10. such as described in any item sensors of claim 1 to 9, which is characterized in that
The clock generation unit includes：
Voltage-controlled oscillator, the voltage-controlled oscillator generate the frequency clock signal corresponding with control voltage；And
Voltage generating unit, the voltage generating unit at the time of being based on the clock signal according to, with the difference of the reference instant, adjusting
The control voltage.
11. sensor as claimed in claim 10, which is characterized in that
The control unit obtains the reference instant from outside,
The moment is being preset based on the reference instant, the sensor is made to start to detect the physical quantity,
Pass through the time according at the time of described preset and based on what clock signal progress timing obtained, when generating internal
It carves,
Based on the difference at the internal moment and the reference instant, the frequency of the clock signal is adjusted, so that when described internal
It carves and the difference of the reference instant becomes smaller.
12. such as described in any item sensors of claim 1 to 11, which is characterized in that
The control unit reduces the frequency of the clock signal in the case where that will be inserted into leap second in the reference instant.
13. sensor as claimed in claim 12, which is characterized in that
In the case that the control unit inserts leap second in the reference instant, institute is reduced in a period of entirely presetting
The frequency of clock signal is stated, thus delay length corresponding with the leap second being inserted at the time of making based on the clock signal.
14. such as described in any item sensors of claim 1 to 13, which is characterized in that
The control unit is advanced by advance at the time of from than being inserted into the leap second when receiving the notice of leap second to be inserted into
Start at the time of during setting it is entire it is described preset during, the frequency of the clock signal is reduced, to make to be based on
Delay length corresponding with the leap second the being inserted at the time of clock signal.
15. such as described in any item sensors of claim 12 to 14, which is characterized in that
The control unit will indicate in a period of reducing the frequency of the clock signal because being inserted into the leap second as described in
The data for the physical quantity that test section detects with expression are detected in a period of reducing the frequency of the clock signal
This information of data is corresponded to and is exported.
16. such as described in any item sensors of claim 1 to 15, which is characterized in that
The sensor is set to structural body, in acceleration, tilt angle, speed and the displacement for detecting the structural body
At least one of.
17. a kind of control method of sensor, which is characterized in that including such as next stage：
Generate the stage of clock signal；
In the stage of the timing detection physical quantity based on the clock signal；And
Adjust the frequency of the clock signal so that at the time of based on the clock signal with from outside get benchmark when
The stage that the difference carved becomes smaller.
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| JP2017-101917 | 2017-05-23 | ||
| JP2017101917 | 2017-05-23 | ||
| JP2018-017701 | 2018-02-02 | ||
| JP2018017701A JP7040073B2 (en) | 2017-05-23 | 2018-02-02 | Sensors and sensor control methods |
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