JP2008234361A - Strain measuring system and wireless strain amplifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure a strain nearly in real-time by thoroughly preventing consumption of a power supply battery of a slave machine set in a measuring site while a measuring value of strain or the like in the measuring site is in a normal range, and shortening the interval of data acquisition when the measured value shows an abnormal value or the like. <P>SOLUTION: Each of a radio communication part 120, a strain amplifier part 11 and a strain gauge type sensor 3 is operable by power supplied from a battery 15 when switches SW1 and SW2 controlled by a timer 121 are turned ON, and nonoperable by cut of the power from the battery 16 when the switches SW1 and SW2 are turned OFF. A master unit 1 sets the timing of the timer 121 for switching from ON to OFF of the switches SW1 and SW2 according to the strain quantity data transmitted from the salve unit 1. The timer 121 is operated by a timer power source different from the battery 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a strain measurement system and a wireless strain amplifier, and more particularly to a strain measurement system and a wireless strain amplifier that are intended to save battery power in a slave unit or a wireless strain amplifier of the strain measurement system.

Conventionally, strain measuring devices are used for measuring strain in civil engineering facilities and buildings in addition to the natural environment. The amount of strain at the measurement site to be measured is measured at the measurement site where the strain measurement device is installed, and when the data is acquired as it is, it is measured with the strain measurement device installed at the measurement site. There are many usage patterns in which the amount of strain is transmitted to a remote parent device via communication means, and data is acquired in the parent device.
The measurement site where the handset is installed is often a place where workers cannot visit frequently, so saving power batteries in the handset is an important issue. For this reason, a technology has been proposed in which the operation of the transceiver connected to the data logger is limited only to a predetermined time zone in the slave unit (see, for example, Patent Document 1).
However, since there is a case where a measurement request in real time should be satisfied, it is proposed to use a solar power source as a power source in the slave unit as a technique to meet such a request (see, for example, Patent Document 2). .
In addition, as a problem related to the measurement site where the strain measurement device is installed, there is a demand to place a strain measurement device in each of the plurality of measurement sites. A technology has been proposed in which the USB interface is used as a USB standard, and a hub conforming to the USB standard that receives data of a plurality of slave units intensively is installed (see, for example, Patent Document 3).

"JP-A-6-268542" "JP 2005-182643 A" "Japanese Patent Laid-Open No. 2007-1219"

However, in the conventional strain measuring apparatus described in the background art, for example, in the case of the proposal disclosed in Patent Document 1 described above, the operation of the transceiver connected to the data logger is a predetermined value set in advance. Therefore, there is a problem that it is not possible to collect data at a time interval that changes according to the strain situation of the measurement site that changes every moment.
In addition, only the power consumption of the transceiver connected to the data logger is a target for saving power supply power.For example, as in the present invention, a strain gauge sensor built in a Wheatstone bridge continuously generates high power. Focusing on consumption, there has been a problem that power source power of the strain measuring device as a slave unit is insufficiently saved because power source power has not been saved.

  The strain measurement system according to the present invention described in claim 1 is a physical quantity such as strain generated at the measurement location in the site even in the slave unit installed at the measurement location in the measurement site and the parent device in a remote location. The slave unit can measure the physical quantity at the location where the strain gauge type sensor is installed at the time interval determined by the master unit according to the amount of strain transmitted from the slave unit last time. By being sent to the master unit, it is possible to thoroughly prevent the power source battery from being consumed in the slave unit while the physical quantity such as strain at the measurement site is normal. If necessary, a means to shorten the data acquisition interval is provided, so that when the physical quantity at the measurement site reaches an abnormal value, the fact can be grasped quickly and reliably. In addition, the purpose is to provide a strain measurement system that can acquire physical quantities at the measurement site as digital data at near real-time intervals when the physical quantity at the measurement site actually reaches an abnormal value. Yes.

The object of claim 2 of the present invention is to give the master unit a function to change the data acquisition time interval, determine whether the measurement data is normal, caution or abnormal, and appropriately It is another object of the present invention to provide a strain measurement system that can quickly give a command.
The object of claim 3 of the present invention is particularly large when a current constantly flows through the four resistors when the strain gauge type sensor is constituted by a Wheatstone bridge composed of four resistors. To provide a strain measurement system that can solve the problem of power consumption and can reliably prevent the consumption of a power supply battery in a slave unit that uses a Wheatstone bridge type strain gauge sensor assembled with a strain gauge. There is.
The object of claim 4 of the present invention is to provide highly reliable measurement data acquired by the slave unit even when the measurement data in the transmission format is digital data and the communication environment such as a communication path is deteriorated. An object of the present invention is to provide a strain measurement system that can be transmitted to a parent device at a predetermined degree.
The object of claim 5 of the present invention is that the communication means between the slave unit and the master unit is a radio communication unit comprising a single radio communication path, and thereby, between the slave unit and the master unit. An object of the present invention is to provide a strain measurement system that is constructed at a low installation cost without the need to newly lay a communication cable as a communication means.

An object of claim 6 of the present invention is that a physical quantity at a measurement point can be quickly and appropriately transmitted from a wireless strain amplifier as a slave unit installed at a measurement point in a measurement site to the master unit, and power supply means It is an object of the present invention to provide a wireless strain amplifier that can reduce the consumption of power as much as possible and enable long-term measurement.
The purpose of claim 7 of the present invention is to obtain appropriate data in a prompt manner depending on whether the measurement data is in the normal range, the range to be careful of, or the range of abnormality, and to consume the power supply means as much as possible. An object of the present invention is to provide a wireless strain amplifier capable of saving.

In order to achieve the above-described object, the strain measurement system according to the first aspect of the present invention converts a physical quantity detected by a strain gauge sensor into an electrical quantity and transmits it as measurement data, and the child A strain measurement system comprising a master unit that communicates with a machine via a communication path,
In the slave unit,
Data conversion means for converting a physical quantity detected by the strain gauge sensor into measurement data in a transmission format;
Measurement data transmission means for transmitting measurement data in the transmission format to the master unit;
Control information receiving means for receiving control information from the master unit;
Power source means for supplying power to all the circuit elements included in the strain gauge type sensor and each means;
Switch means for turning on or off the power of the power supply means to the strain gauge type sensor and the circuit provided in each means;
A power supply for a timer different from the power supply means, and measures the time interval from the power-off time to the power-on time, and causes the switch means to cut off the power at the start time of the timekeeping. A timer means for sending a control signal to send the control signal to the switch means at the time when the time interval has elapsed, and sending a control signal;
Intermittent time setting means for setting based on postscript control information for instructing the time interval received from the base unit,
In the base unit,
Measurement data receiving means for receiving measurement data transmitted from the slave unit;
In accordance with the measurement data, intermittent time setting command means for determining the time interval as the control information and instructing the slave unit;
Control information transmitting means for transmitting the control information;
It is characterized by having.

Further, in the strain measurement system according to the present invention as set forth in claim 2, when the intermittent time setting command means is in the abnormal state range at a long time interval when the measurement data is in the normal state range. Is characterized in that it is determined so as to be determined at an appropriate intermediate time interval when it is within a range of states to be noted in a short time interval close to real time.
The strain measurement system according to the present invention described in claim 3 is characterized in that the strain gauge type sensor is a sensor or a converter configured as a Wheatstone bridge with four strain gauges.
The strain measurement system according to the present invention described in claim 4 is characterized in that the measurement data in the transmission format is digital data.
Furthermore, the strain measurement system according to the present invention described in claim 5 is characterized in that the communication means between the slave unit and the master unit is a wireless communication unit comprising a single wireless communication path.

Further, in order to achieve the above-described object, the wireless strain amplifier according to the present invention described in claim 6 converts a physical quantity detected by the strain gauge sensor into an electrical quantity and transmits it as measurement data to the parent device. And a wireless strain amplifier for receiving transmission information from the master unit,
Data conversion means for converting a physical quantity detected by the strain gauge sensor into measurement data in a transmission format;
Measurement data transmission means for transmitting measurement data in the transmission format to the master unit;
Control information receiving means for receiving control information from the master unit;
Power source means for supplying power to the strain gauge type sensor and circuit elements included in each means;
The power of the power supply means is input to the strain gauge type sensor and a circuit included in each means, and an interruption switch means,
A power supply for a timer different from the power supply means, and measures the time interval from the power-off time to the power-on time, and causes the switch means to cut off the power at the start time of the timekeeping. A timer means for sending a control signal to send the control signal to the switch means at the time when the time interval has elapsed, and sending a control signal;
Intermittent time setting means for setting the time interval based on the control information for instructing the time interval received from the base unit;
It is characterized by having.
Further, in the wireless strain amplifier according to the present invention described in claim 7, the time interval of the intermittent time is in a range of abnormal state at a long time interval when the measurement data is in a range of normal state. In some cases, the time interval is set to a short time interval close to real time, and when it is within the range of the state to be noted, an appropriate intermediate time interval is set.

According to the invention of claim 1, a slave unit that converts a physical quantity detected by the strain gauge sensor into an electrical quantity and transmits it as measurement data, a master unit that communicates with the slave unit via a communication path, A strain measurement system comprising:
In the slave unit,
Data conversion means for converting a physical quantity detected by the strain gauge sensor into measurement data in a transmission format;
Measurement data transmission means for transmitting measurement data in the transmission format to the master unit;
Control information receiving means for receiving control information from the master unit;
Power source means for supplying power to all the circuit elements included in the strain gauge type sensor and each means;
Switch means for turning on or off the power of the power supply means to the strain gauge type sensor and the circuit included in each means;
A power supply for a timer different from the power supply means, and measures the time interval from the power-off time to the power-on time, and causes the switch means to cut off the power at the start time of the timekeeping. A timer means for sending a control signal to send the control signal to the switch means at the time when the time interval has elapsed, and sending a control signal;
Intermittent time setting means for setting based on postscript control information for instructing the time interval received from the base unit,
In the base unit,
Measurement data receiving means for receiving measurement data transmitted from the slave unit;
In accordance with the measurement data, intermittent time setting command means for determining the time interval as the control information and instructing the slave unit;
Control information transmitting means for transmitting the control information;
Therefore, it is possible to accurately grasp the physical quantity generated at the measurement location at the relevant site in the master unit located at a distance from the slave device installed at the measurement location at the measurement location. From the machine, the physical quantity at the location where the strain gauge type sensor is installed is measured at the time interval determined by the parent machine according to the size of the physical quantity sent from the child machine last time and sent to the parent machine. Since the measurement time interval is rationally changed according to the physical quantity at the measurement site, a strain measurement system that can rationally reduce the consumption of power supply means and accurately acquire measurement data is provided. be able to.

According to a second aspect of the present invention, the intermittent time setting command means is arranged in a long time interval when the measurement data is in a normal state range, and in real time when the measurement data is in an abnormal state range. When it is in the range of the state to be noted in a short short time interval, it is determined to be determined in the middle appropriate time interval. Therefore, during the period when the physical quantity at the measurement site is normal, the power supply battery in the slave unit is It is possible to prevent exhaustion thoroughly, and the master unit can shorten the data acquisition interval as necessary, and when the physical quantity at the measurement site reaches an abnormal value, It is possible to quickly grasp, and when the physical quantity at the measurement site actually reaches an abnormal value, the physical quantity data at the measurement site is measured at an interval close to real time. It is possible to provide a strain measurement system it is possible to acquire the data.
According to the invention described in claim 3, since the strain gauge type sensor is a sensor or a converter configured with four strain gauges in a Wheatstone bridge, the Wheatstone bridge configured with these four strain gauges. Therefore, it is possible to provide a strain measuring system that can reliably prevent the power source battery from being consumed in the slave unit due to a large amount of power being consumed due to constant current flow, and can extend the power source battery.

According to the invention of claim 4, the measurement data in the transmission format is digital data. Therefore, even if the communication environment such as the communication path is deteriorated, the measurement data acquired by the slave unit is used. Therefore, it is possible to provide a strain measurement system that can be transmitted to the parent device with high reliability.
Furthermore, according to the invention described in claim 5, the communication means between the slave unit and the master unit does not need to newly lay a communication cable using the wireless communication means consisting of a single wireless communication path as the communication means, A strain measurement system can be constructed and provided at a low construction cost (installation cost).

According to the invention of claim 6, the wireless strain that converts the physical quantity detected by the strain gauge sensor into an electrical quantity and transmits it as measurement data to the master unit and receives transmission information from the master unit. An amplifier,
Data conversion means for converting a physical quantity detected by the strain gauge sensor into measurement data in a transmission format;
Measurement data transmission means for transmitting measurement data in the transmission format to the master unit;
Control information receiving means for receiving control information from the master unit;
Power source means for supplying power to the strain gauge type sensor and circuit elements included in each means;
The power of the power supply means is input to the strain gauge type sensor and a circuit included in each means, and an interruption switch means,
A power supply for a timer different from the power supply means, and measures the time interval from the power-off time to the power-on time, and causes the switch means to cut off the power at the start time of the timekeeping. A timer means for sending a control signal to send the control signal to the switch means at the time when the time interval has elapsed, and sending a control signal;
Since the time interval is set on the basis of the control information for instructing the time interval received from the master unit, the measurement site for the master unit in a remote place (may be in the vicinity) It is possible to accurately transmit the physical quantity at the measurement location where the strain gauge type sensor is installed, and to the strain gauge type sensor at the time interval determined by the main unit according to the size of the measurement data transmitted last time. Therefore, the strain amount can be measured and the measurement result can be sent to the main unit as measurement data. Therefore, measurement data can be collected accurately and without waste, and consumption of the power supply means can be reduced as much as possible, and long-term measurement can be performed. It is possible to provide a wireless strain amplifier capable of satisfying the requirements.

  According to the invention of claim 7, the time interval of the intermittent time is set to a long time interval when the measurement data is in a normal state range, and in real time when the measurement data is in an abnormal state range. When it is in the range of conditions to be aware of in a short short time interval, it is set to an appropriate intermediate time interval, so exhaustion of the power battery is thoroughly prevented while the physical quantity at the measurement site is normal And the data acquisition interval can be shortened as necessary. Therefore, when the physical quantity at the measurement site reaches an abnormal value, the fact is surely grasped and the time interval is continued. Can be transmitted to the main unit, and when the physical quantity at the measurement site actually reaches an abnormal value, the physical Data obtains, it is possible to provide a wireless distortion amplifier can be transmitted to the master unit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a strain measurement system and a wireless strain amplifier according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 shows the configuration of the main part of a strain measurement system according to one embodiment of the present invention.
In the figure, the strain measurement system of the present embodiment receives the measurement data from the slave unit 1 (wireless strain amplifier according to the present embodiment) installed at or near the measurement site and the slave unit 1. A master unit 2 that controls the slave unit 1, a strain gauge sensor 3 that is installed at a measurement location in the measurement site and measures physical quantities such as strain, displacement, acceleration, force, pressure, and inclination angle of the measurement location; And a communication path 10 connecting the machine 1 and the parent machine 2. The subunit | mobile_unit 1 is the radio | wireless communication for communicating with the main | base station 2 with the distortion | strain amplifier part 11 which amplifies the analog data signal corresponding to the various physical quantities (henceforth "strain amount") which the strain gauge type sensor 3 detected. Unit 120 and battery 15 as power supply means. The strain amplifier unit 11 receives a switch SW1 as switch means for turning on / off the power of the battery 15 in accordance with a control signal described later, and the power of the battery 15 via the switch SW1, and the strain gauge sensor 3 receives a constant voltage or a constant. A power supply unit 111 that supplies a bridge power supply including current and an amplifier 112 that amplifies an analog data signal are provided.

  Further, the wireless communication unit 120 converts an analog data signal sent from the distortion amplifier unit 11 into a digital signal by an A / D converter 122 described later, and sets control information received from the base unit 1 in a timer 121 described later. A data control unit 12 (including data conversion means and intermittent time setting means described later) and a transmission / reception control unit 13 (measurement described later) that transmits measurement data to the parent device 2 and receives a control signal from the parent device 2 Data transmission means and control information reception means) and an antenna unit 14 necessary for wireless transmission and reception. Further, the data control unit 12 includes a switch SW2 as a switch unit that turns on / off the power of the battery 15 according to a control signal to be described later, As an A / D converter 122 that converts an analog data signal sent from the amplifier unit 11 into a signal as digital data conversion means, and a timer means that has a timekeeping function and sends a control signal that simultaneously controls the switches SW1 and SW2. The timer 121 is provided.

The timer 121 simultaneously turns off the switch SW1 and the switch SW2 at the time when the timing is started, and turns off by measuring the period (intermittent time) from the time when the switch SW1 and the switch SW2 are turned on to the time when the switch is turned on. A control signal for turning on the switch SW1 and the switch SW2 is sent to the switch SW1 and the switch SW2.
On the other hand, although not shown, the base unit 2 can be configured by a communication terminal device including a computer, for example. The strain gauge type sensor 3 is a strain gauge type sensor in which a Wheatstone bridge is assembled with four strain gauges having the same resistance value. Incidentally, this strain gauge type sensor consumes much more power than a semiconductor type strain sensor, and when it is always connected to the battery 15, the battery 15 is remarkably depleted in the amount of power stored in it for a short time (actual In the usage example, it is only about 2 to 3 hours). In addition, what set the transmission / reception part 13 and the antenna part 14 as a set can be used with a commercially available apparatus. The timer 121 is operated by a timer power supply (generally a battery having a smaller capacity than the battery 15) different from the battery 15.

Hereinafter, functions of a main part of the strain measurement system according to the present embodiment will be described.
The wireless communication unit 120, the strain amplifier unit 11, and the strain gauge sensor 3 can be operated by supplying power from the battery 15 when the switches SW 1 and SW 2 controlled by the timer 121 are turned on. When the switch SW1 and the switch SW2 are turned off, the power supply power of the battery 15 is cut off and becomes inoperable. During this operable period, the voltage value (or current value) corresponding to the strain amount of the strain generated at the measurement location is measured from the strain gauge type sensor 3 installed at the measurement location at the measurement site. ) Is sent to the amplifier 112, further amplified by the amplifier 112, and sent to the A / D converter 122 of the data control unit 12. The A / D converter 122 converts the analog electric signal sent from the amplifier 112 into a digital data signal and sends it to the transmission / reception control unit 13. The transmission / reception control unit 13 as the measurement data transmission unit modulates the digital data signal transmitted from the A / D converter 122 into a wireless communication signal and transmits the wireless communication signal to the antenna unit 14. The antenna unit 14 emits a wireless communication signal of digital data sent from the transmission / reception control unit 13 into the air as a wireless signal (electromagnetic wave) and transmits the wireless signal toward the parent device 2.

The base unit 2 receives the radio signal transmitted from the radio communication unit 120 by the measurement data receiving means, demodulates it into digital data, verifies the content of the demodulated digital data, and determines the intermittent time according to the verification result. The setting command means determines a control signal (described later) to the handset 1 and the control information sending means sends it to the handset 1. In this verification matter, it is judged whether the strain amount of the strain at the place where the strain gauge type sensor 3 is installed is within a normal value range, reaches a value to be noted, or indicates an abnormal value. Is included. The intermittent time setting command means of the parent device 2 transmits (commands) the intermittent time set in the timer 121 (that is, the period until the switches SW1 and SW2 are turned from OFF to ON) as control signal information. Suruga, as long as it is within the range of the strain amount is normal, this maximum value as an intermittent time (a T ₁ in this case) is determined and if reaches the value noted that the strain amount, the intermittent determining an intermediate value (here, T ₂₎ as the time, if the strain amount indicates an abnormal value, the mobile terminal 1 to determine the minimum value (here, T ₃₎ as the intermittent time Command.

  This control signal is modulated into a radio communication signal and transmitted to the radio communication unit 120 of the slave unit 2, demodulated by the transmission / reception unit control unit 13 as control information receiving means, and transmitted to the timer 121 of the data control unit 12. . Accordingly, the intermittent time determined by the parent device 2 is set in the timer 121. The switches SW1 and SW2 are simultaneously turned off by a control signal from the timer 121 when the timer 121 starts timing, and then are simultaneously turned on again in response to the control signal from the timer 121 that measures the passage of this intermittent time. .

FIG. 2 is a flowchart showing the operation of the strain measurement system according to the embodiment of the present invention.
Hereinafter, the operation of the strain measurement system according to the embodiment of the present invention will be described with reference to FIG. 1 and the flowchart shown in FIG.
First, the data control unit 12 of the slave unit 1 turns on the switch SW1 and the switch SW2 from the timer 121 because it is in the initial state of the operation start of this system or the timer 121 has counted the lapse of the intermittent time. Is sent to the switch SW1 and the switch SW2, and the switch SW1 and the switch SW2 that have been turned off are turned on, and the power of the battery 15 is supplied to the wireless communication unit 120 and the distortion amplifier unit 11 of the slave unit 1. These are supplied to each of the strain gauge type sensors 3, and these components can be operated (step S1).
Thereby, the strain amplifier unit 11 of the slave unit 1 receives the voltage value as an electrical signal corresponding to the strain amount of the strain generated at the measurement location from the strain gauge type sensor 3 installed at the measurement location at the measurement site. (Analog amount) is amplified and sent to the data control unit 12. The data control unit 12 converts this electrical signal into a digital data signal and sends it to the transmission / reception control unit 13 (step S2).

Next, the transmission / reception control unit 13 of the child device 1 modulates this digital data signal into a wireless communication signal, and transmits it to the parent device 2 from the antenna unit 14 as a wireless signal (electromagnetic wave) (step S3).
In response to this, the master unit 2 demodulates the received wireless communication signal into a digital data signal (step S4), and further, the master unit 2 verifies the data indicated by this signal, thereby It is determined whether or not the strain amount data of the strain measured by the strain gauge type sensor 3 installed in is within a normal range, and if the strain amount data is within the normal range, the process proceeds to step S7. If the amount data is not within the normal range, the process proceeds to step S6 (step S5).
In step S6, base unit 2 determines whether or not the strain amount has reached a value to be warned, or has exceeded a value to be warned and has reached an abnormal value. If it should be a value, the process proceeds to step S8, and if the strain amount data exceeds the value to be noted and indicates an abnormal value, the process proceeds to step S9.
In step S7 described above, as a control signal for transmission to the timer 121, generates a control signal for setting the maximum value of the intermittent time set in the timer 121 (here, T _1), the flow proceeds to step S10. Incidentally, _{T 1,} for example, to be 1 hour.

In step S8, as a control signal for transmission to the timer 121, it generates a control signal for setting the intermittent time set in the timer 121 to an intermediate value (here, T _2), proceeds to step S10. Incidentally, _{T 2} is, for example, 10 minutes.
In step S9, as a control signal for transmission to the timer 121, it generates a control signal for setting the intermittent time set in the timer 121 to the minimum value (here, T _3), proceeds to step S10. Incidentally, _{T 3,} for example, to 1 minute.
In step S10, the parent device 2 transmits the generated intermittent time (any one of T ₁ , T ₂ , T ₃ ) to the child device 1 as control data by the transmitter / receiver.
Upon receiving the transmission from the parent device 2, the wireless communication unit 120 of the child device 1 receives the control signal via the antenna unit 14 and the transmission / reception control unit 13 (step S11), and the data control unit 12 receives the control signal. Any of the intermittent times T ₁ , T ₂ and T ₃ indicated by the control signal is set in the timer 121 (step S12).

Next, the data control part 12 of the subunit | mobile_unit 1 starts the timer 121 (step S13). Thereby, immediately after that, a signal for turning off the switch SW1 and the switch SW2 is sent from the timer 121 to the switch SW1 and the switch SW2 (step S14). As a result, both the switch SW1 and the switch SW2 are turned off, and the power of the battery 15 is obtained by the wireless communication unit 120, the strain amplifier unit 11, the strain gauge type sensor 3, and the A / D converter of the slave unit 1 excluding the timer 121. These components are deactivated as they are no longer supplied to each of 122.
During this time, the timer 121 is operated by a timer power supply different from that of the battery 15, and monitors when the stop time elapses, and a predetermined intermittent time (any one of T ₁ , T ₂ , T ₃ ). While the period of time does not elapse, the process returns to step S14 to maintain the power OFF state. However, when the stop time (intermittent time) elapses from the start time in step S13, the process returns to step S1 again (step S15).

  Since the strain measurement system according to the present embodiment is configured as described above, from the handset 1, the strain amount of the strain at the measurement site in the field where the strain gauge type sensor 3 is installed is measured near the measurement site or remotely. Can be transmitted to the base unit 2 in the ground. In addition, since the master unit 2 determines and determines the transmission timing and the measurement interval of the strain amount according to the magnitude of the strain amount transmitted from the slave unit 1 last time, the strain amount of the strain at the measurement site is normal. During this period, the battery 15 can be thoroughly prevented from being consumed, and the master unit 2 can shorten the data acquisition interval as necessary. When the amount reaches an abnormal value, it is possible to quickly and reliably grasp the fact, and when the amount of strain at the measurement site actually reaches the abnormal value, an interval close to real time, for example, It becomes possible to acquire strain amount data at the measurement site at intervals of 30 seconds to 1 minute.

A program for executing at least a part of the processing of each component of the wireless strain amplifier according to the present invention by computer control and causing the computer to execute the above processing according to the procedure shown in the flowchart of FIG. It may be stored in a computer-readable recording medium such as a semiconductor memory, a CD-ROM or a magnetic tape and distributed. A computer including at least a microcomputer, a personal computer, and a general-purpose computer may read the program from the recording medium and execute the program.
The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the spirit of the present invention.
For example, the intermittent times T ₁ , T ₂ , and T ₃ set in the timer 121 are not limited to three types, and can be set as appropriate, such as two types, four types, and five types. ₁ , T ₂ and T ₃ are shown as examples of 1 hour, 10 minutes, and 1 minute. However, in continuous measurement of the measurement target, appropriate data is collected during normal times and abnormal times or during warnings. Moreover, it can be set as appropriate in consideration of the consumption (duration) of the power battery.

In addition, strain gauge sensors measure physical quantities in structures, the ground, underground, underwater, etc., such as strain, displacement, load, force, pressure, acceleration, tilt angle, temperature, etc. A strain gauge attached to the object itself or the strain generating part of the strain generating body and exhibiting a resistance change corresponding to the strain is a strain gauge, displacement transducer, load transducer, pressure transducer that converts the physical quantity into an electrical quantity. Acceleration converters, inclinometers, temperature sensors, etc. can be applied.
In the above-described embodiment, the example in which the intermittent time setting command unit and the control information transmission unit are provided on the base unit 2 side has been described. However, if the battery 15 is consumed, in other words, the measurement duration is not a problem. Alternatively, it may be provided on the handset 1 side.

It is a block diagram which shows the structure of the principal part of the distortion | strain measurement system which concerns on one embodiment of this invention. It is a flowchart figure which shows operation | movement of the distortion | strain measurement system which concerns on one embodiment of this invention.

Explanation of symbols

1 Slave Unit 2 Master Unit 3 Strain Gauge Sensor 10 Communication Channel 11 Strain Amplifier Unit 12 Data Control Unit 13 Transmission / Reception Control Unit 14 Antenna Unit 15 Battery (Power Unit of Slave Unit)
111 Power Supply Unit 112 Amplifier 120 Wireless Communication Unit 121 Timer 122 A / D Converter SW1, SW2 Switch

Claims (7)

A strain measurement system comprising: a slave unit that converts a physical quantity detected by a strain gauge sensor into an electrical quantity and transmits it as measurement data; and a master unit that communicates with the slave unit via a communication path,
In the slave unit,
Data conversion means for converting a physical quantity detected by the strain gauge sensor into measurement data in a transmission format;
Measurement data transmission means for transmitting measurement data in the transmission format to the master unit;
Control information receiving means for receiving control information from the master unit;
Power source means for supplying power to all the circuit elements included in the strain gauge type sensor and each means;
Switch means for turning on or off the power of the power supply means to the strain gauge type sensor and the circuit included in each means;
A power supply for a timer different from the power supply means, and measures the time interval from the power-off time to the power-on time, and causes the switch means to cut off the power at the start time of the timekeeping. A timer means for sending a control signal to send the control signal to the switch means at the time when the time interval has elapsed, and sending a control signal;
Intermittent time setting means for setting based on postscript control information for instructing the time interval received from the base unit,
In the base unit,
Measurement data receiving means for receiving measurement data transmitted from the slave unit;
In accordance with the measurement data, intermittent time setting command means for determining the time interval as the control information and commanding the slave unit;
Control information transmitting means for transmitting the control information;
A strain measurement system characterized by comprising: The intermittent time setting command means sets the measured data in a range of states to be noted in a long time interval when it is in a normal state range, and in a short time interval near real time when it is in an abnormal state range. 2. The strain measurement system according to claim 1, wherein the strain measurement system is configured to determine each at an appropriate intermediate time interval. The strain measurement system according to claim 1, wherein the strain gauge type sensor is a sensor or a transducer configured as a Wheatstone bridge with four strain gauges. The strain measurement system according to claim 1, wherein the measurement data in the transmission format is digital data. The strain measurement system according to any one of claims 1 to 3, wherein the communication unit between the slave unit and the base unit is a wireless communication unit including a single wireless communication path. A wireless strain amplifier that converts a physical quantity detected by a strain gauge sensor into an electrical quantity and transmits it as measurement data to the parent machine and receives transmission information from the parent machine,
Data conversion means for converting a physical quantity detected by the strain gauge sensor into measurement data in a transmission format;
Measurement data transmission means for transmitting measurement data in the transmission format to the master unit;
Control information receiving means for receiving control information from the master unit;
Power source means for supplying power to the strain gauge type sensor and circuit elements included in each means;
The power of the power supply means is input to the strain gauge type sensor and a circuit included in each means, and an interruption switch means,
A power supply for a timer different from the power supply means, and measures the time interval from the power-off time to the power-on time, and causes the switch means to cut off the power at the start time of the timekeeping. A timer means for sending a control signal to send the control signal to the switch means at the time when the time interval has elapsed, and sending a control signal;
Intermittent time setting means for setting the time interval based on the control information for instructing the time interval received from the base unit;
A wireless strain amplifier characterized by comprising: The interval of the intermittent time is a long time interval when the measurement data is in the normal state range, and a short time interval close to real time when the measurement data is in the abnormal state range. 6. The wireless distortion amplifier according to claim 5, wherein the wireless distortion amplifier is set at an appropriate intermediate time interval.

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