JPH07306061A - Data recorder and synchronous recording system - Google Patents

Abstract

PURPOSE:To provide a light-weight and compact data recorder. CONSTITUTION:The recorder is constituted of a battery, a signal-adjusting part for processing input signals from a sensor, a recording part for preserving processed signals as data, and a control part having a function to automatically start recording of data, all incorporated in one unit. Since the recorder is connected and wired immediately beside each sensor, a wiring length is considerably shortened. Since necessary data are automatically collected as a train passes, it is enough for an operator to wait at a safe place far from a measuring point after connecting the data recorder to the sensor. Accordingly, a preparatory work for the measurement is simplified, thus improving a working efficiency and a safety.

Description

Detailed Description of the Invention

[0001]

[Industrial application] To ensure the safe operation of trains,
It is necessary to regularly inspect the sound condition of railway structures such as rails, bridges and bridge girders. This inspection is generally performed by measuring stress (strain), displacement, vibration, etc. of the structure. The present invention relates to a data recorder provided with such a power supply and a signal adjusting function used for measurement work, and an object thereof is to improve work safety and efficiency.

[0002]

2. Description of the Related Art Stress (strain), displacement, and vibration are examples of measurement items for determining the soundness of railway structures. The stress (strain) measurement can be used to detect a decrease in bridge strength, train load, etc., and displacement measurement can detect the amount of deflection or rattling of a bridge girder during train travel to determine running stability, or bridge It is possible to know the strength deterioration of the building, the subsidence of the bridge pier or abutment, etc., and it is possible to grasp the change of the ground condition and the presence of cracks inside the structure from the vibration measurement.

Conventionally, stress (strain) of railway structures
To measure displacement, vibration, etc., a sensor, a signal conditioner, a recording device, and a power supply device are generally required. Specifically, for example, when measuring stress, a strain gauge is used as a sensor and a dynamic strain gauge is used as a signal adjusting device. A dial gauge is used instead as a sensor for displacement measurement. Further, when measuring vibration, an accelerometer is used as a sensor and a vibrometer is used as a signal adjusting device. A power generator is usually used as a power supply device, and an electromagnetic oscilloscope may be used together for confirming data recording.

The following is a description of an actual measuring method, taking as an example the case of measuring the vibration of a pier when a train passes. In order to measure vibration, first, as shown in FIG. 7, accelerometers 1 as sensors are arranged at a plurality of locations on the surface of the pier B, and each accelerometer 1 is placed at a location distant from the pier B. And an electric cord 5 are used for wiring connection. The vibrometer 2 is connected to the recording device 3, and further an electromagnetic oscilloscope (not shown) is connected if necessary. A generator 4 is connected to each device to supply electric power.

Before starting the vibration measurement, the input range is adjusted so that the voltage signal output from the sensor can be recorded as proper data. It should be noted that in order to make it easy to identify the recorded data later, identification information is attached to the recording medium in advance. For example, if the recording device is a tape recorder, the operator records the recording time and the like by voice in the head portion of the recording area of the tape.

When the above-mentioned preparation for measurement is completed, the passage of a train is awaited. When the train approaches the measurement point at a certain distance, the operator activates the recording device to start data recording, and stops the recording device after a predetermined recording time has elapsed.
During this time, monitor the electromagnetic oscilloscope to see if the data was recorded reliably.

When the data recording for a predetermined number of times is completed in this way, the accelerometer 1 is removed from the pier B and the electric cord 5 is wound up. Then, the apparatus is moved to another place, the same preparatory work as described above is performed again, and then the measurement is performed. Usually 2-3 for each type of measurement item
Repeat the measurement several times at each location.

[0008]

Conventional signal conditioners and recorders are of the multi-channel type so as to be able to simultaneously process the signals emitted by a plurality of sensors. Therefore, these signal conditioners and recorders are bulky and heavy. Further, the generator that supplies electric power to each device is larger and heavier than those.
For this reason, conventionally, each of the above-described devices can be loaded on a vehicle 6 or the like and moved.

By the way, in the case of mounting the measuring sensor on the surface of a bridge girder or a bridge pier, it is almost impossible from the measurement environment to park a vehicle loaded with each device near the bridge girder or pier. is there. For this reason, a cord of a considerable length is required for wire connection between the sensor and each device, and in some cases, the extension distance of the cord may exceed 50 m. As a result, there is a drawback that the work of connecting the wiring between the sensor and the device is very troublesome. Moreover, since the wiring connection of the cord is often carried out at a high place or while passing through a train, there is a problem that the safety for the worker is lowered as the working time is prolonged.

Further, it is usual that the measurement work is repeatedly carried out at a plurality of points, and the sensor must be attached and detached and the cord must be wired every time it is moved to another place. The larger the number of installed, the more the work load becomes proportionally larger, and the more dangerous the work becomes.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a lightweight and compact data recorder connected to a sensor. A feature of the data recorder according to the present invention is that it has a battery, a signal adjusting unit that processes a signal input from a sensor, a recording unit that stores the processed signal as data, and an automatic data recording start function. It is configured by integrally incorporating the control unit that it has.

Further, the synchronous recording system adopted by the present invention synchronizes with another data recorder based on the function of outputting the synchronization signal to the other data recorder and / or the synchronization signal output from the other data recorder. Using a plurality of data recorders that have the function of performing recording, connect the remaining slave setting machine to one master setting machine selected from them, and the remaining based on the synchronization signal output from the master setting machine. The slave setting machine is set to perform recording simultaneously with the master setting machine.

[0013]

In the data recorder according to the present invention, the battery, the signal adjusting unit, the recording unit and the control unit are integrally incorporated and the automatic data recording start function is provided. Can be used. Therefore,
Since it can be installed right next to the sensor, the wiring length is very short. Moreover, since necessary data is automatically recorded according to phenomena such as passing trains, the worker connects the data recorder to the sensor, and then measures a predetermined number of times at a safe place away from the measurement point. It will be better if you wait until the end.

Further, in the synchronous recording system according to the present invention, data is automatically recorded in synchronization with other slave setting machines based on the synchronization signal output from one master setting machine. It is possible to easily obtain relevant data.

[0015]

The details of the present invention will be described below with reference to the drawings illustrating the embodiments. FIG. 1 shows a data recorder 1 of this embodiment.
0 shows the appearance. The data recorder 10 is of a one-channel recording system that operates by a built-in battery and can handle both a distortion signal and a DC voltage (DC) signal. The recorded data is stored in an IC card. It has a function that can be easily taken out. As shown in the figure, the data recorder 10 has a rectangular parallelepiped outer shape, and has dimensions of about 240 mm in length × about 180 mm in width × about 50 mm in height, and has a waterproof or drip-proof structure.

On the front surface 10a side shown in FIG.
Connect a strain gauge or dial gauge with a strain input terminal 11 for a strain signal output from them, a DC input terminal 12 for a DC voltage signal connected with an accelerometer and output from here, and another data recorder. A synchronous input terminal 13 and a synchronous output terminal 14 for connection, an external trigger terminal 15 for inputting an external trigger signal, an external power supply terminal 16 when an external power supply is used as an operating power supply, a monitor output monitor terminal 17, A sounding section 18 of a buzzer that emits an electronic sound for a predetermined time after the completion of data recording, a power switch 19, a power indicator 2 that indicates an ON state of a power source
0, a trigger indicator 21 is provided which keeps blinking when a trigger is applied until data recording is completed.

The power switch 19 can be switched in three stages,
In addition to power ON / OFF control, it also functions as switching to remote control by the host computer described later.

The power indicator 20 is a yellow-green L
The ED is set to continuously light up when the power is turned on, and blinks when the battery output drops, the IC card setting error, the calendar timer setting error, 0 balance adjustment or calibration error occurs.

The sync input terminal 13 is also used for communication with an external host computer.

The external trigger terminal 15 is for inputting an external trigger signal from an external dry contact or an open connector to forcibly apply a trigger. It is insulated from the internal circuit by a photo coupler to prevent noise from entering.

The upper panel 10b shown in FIG.
Liquid crystal display (LCD) 22, trigger indicator 23, stop switch 24 for releasing the standby state to stop state, start switch 25 for shifting to the standby state for data recording, pause switch 26 for temporarily suspending the standby state, recorded data To read the number / trigger time, data recording status, presence / absence of data, etc.
A check switch 27 for displaying on a CD is provided.

The LCD 22 is, for example, a screen display of 16 characters × 2 lines, and displays the following items, for example. Note that the backlight is not normally used to save power consumption. Device status and current time (standby / recording / communication etc. This is normally displayed.) IC card recording data information (recording number / recording time /
Whether or not the maximum value of recorded data does not exceed 90% of the range. By check switch. ) Error messages (low battery / absence of IC card, etc.) Device number, firmware version, etc. (displayed immediately after power is turned on.)

The trigger indicator 23 is an ultra-high brightness red LED, and blinks in synchronization with the trigger indicator 21 on the front panel from the time when the trigger is applied until the data recording to the IC card is completed. Is set. By providing the trigger indicators 21 and 23 on both the front surface and the upper surface, it is possible to easily confirm the data recording from a remote place. If the indicator is provided on only one side,
Depending on the installation condition of the data recorder, if it is hidden, it will be difficult to view it from a distant position.

On the side of the back surface 10c shown in FIG. 2C, a battery loading port 28 with a lid attached, an IC card insertion port 29 for storing data, a status setting switch 30 of the data recorder and a device number. A setting switch 31 is provided.

The state setting switch 30 employs an 8-dip switch in this embodiment. Setting items include setting whether the recorder is a master unit or a slave unit when connecting multiple recorders, and setting whether it is a terminal device when connecting multiple recorders (however, if there is only one unit, set it to the end). Examples include switching the capacitor insertion to the DC amplifier circuit (setting depending on the sensor type) and setting the data communication speed (baud rate). It should be noted that the baud rate can be set in 2 ² = 4 ways by turning them on and off, for example, if two switches are assigned to the baud rate.

The device number setting switch 31 is used to identify each device when a plurality of data recorders are connected for synchronous measurement. In this embodiment, a quadruple dip switch is used, and therefore the O of each switch is used.
N to OFF, from 0000 (device number = 0) to 111
16 addresses (= 2 ⁴ ) up to 1 (device number = 15) can be set. Therefore, in this embodiment, the maximum number of connectable data recorders when performing synchronous measurement is 16 in principle. Of course, if 5 or more dip switches are used, 16 or more connections can be made.

It is desirable to set the weight of the data recorder so that it does not exceed 1 kg. The reason for this is that when fixing the data recorder together with the sensor to the measurement point, mortar such as mortar that is easy to put on and take off and has an early adhesion strength is used. In this case, if the weight exceeds 1 kg, fixing becomes very difficult.

As shown in FIG. 2, the system configuration of the data recorder 10 according to the present invention is as follows. A strain amplifier for a strain signal from a strain gauge or a dial gauge, a DC amplifier for a DC signal from an accelerometer, and these amplifiers. A signal adjusting section mainly including an A / D converter for converting a signal into a digital signal;
A control unit whose main part is a PU, storage device, timer, etc.,
A recording unit to which an IC card is detachably mounted and a battery are used as basic components, and an interface for communicating with an external host computer is incorporated therein. Here, a portable personal computer or the like can be used as the host computer.

The battery is preferably a lithium battery because of its small size (= light weight), high energy density (= high output), and small self-discharge (= long life), but it is by no means limited. In this embodiment, the operating voltage of the battery is about 12
V, and is configured to allow continuous use for approximately 3 hours. Alternatively, a battery that can be charged by an external power source may be used.

The IC card not only allows the recorded data to be read by the host computer through the reader / writer, but also transmits the setting information of the data recording condition to the device. Therefore, the recording unit also has a function of reading the recording conditions written in the IC card. The items set by the IC card are illustrated below. a) Input mode: Distorted signal or DC signal. b) Trigger type: level trigger or external trigger. In the slave setting machine, the synchronization trigger is automatically set. c) Filter cutoff frequency: The cutoff frequency of the low-pass filter is set to OFF, 10, 30, 100.30.
Select from 0Hz. (However, even if it is OFF, 3
It has a cut-off characteristic of 000 Hz. ) D) Sampling period: 10/50/100/500 /
Select from 1000Hz. Alternatively, it is synchronized with the master machine. e) ON / OFF of auto-trigger leveling and trigger level: When OFF, the trigger level is the X. Set to X%. When it is ON, the Y.T. Set to Y times. (The auto trigger leveling function will be described later.) F) Recording time: 1 to 60 seconds. Set in seconds. g) Pre-trigger time: 0.1 to 5.0 seconds (The pre-trigger function will be described later.) h) Trigger prohibition time: Standby time after completion of recording. 1 second to 6
00 seconds. i) Number of recordings: 10 seconds × 10 times for impact vibration measurement, 1 minute × 5 times for stress / displacement / vibration measurement. The maximum number of recordings is automatically determined from the capacity of the IC card. j) Comment: It is possible to record a comment in English letters, numbers or Kanji.

It is preferable to use RS422 as an interface for communication with an external host computer, assuming that long-distance communication of up to about 50 m is required, but other standard interfaces may be adopted depending on conditions. Is. Also, since the interface on the host computer side is often RS232C, a conversion adapter is used to connect them. Data communication with the host computer is executed through the sync input terminal.

By connecting the host computer to the data recorder, the above a set by the IC card
It is possible to set and read the recording conditions of ~ j online. Furthermore, the host computer sets / reads the current time (year, month, day, hour, minute, second) of the real-time clock (RTC) built into the data recorder, remote control of device status by command,
It is possible to execute a command trigger for triggering by an instruction, reading of 0 balance value, CAL value, trigger level value, etc., reading of recorded data of an IC card, etc.

Furthermore, when a plurality of data recorders are connected by multi-drop, the host computer connected to the master setting machine sets recording conditions and RTCs for all devices or for any device for which a device number is designated.・ A command trigger and reading of recorded data can be executed. In this embodiment, the polling / selecting method is adopted as the method of establishing the data link between the master and the slave. In addition, when the response from the slave setting machine to the master setting machine after data transfer is binary data, the data communication is assumed to be a transparent method.

The circuit configuration of the signal adjusting section is shown in FIG.
The aforementioned distortion input terminal, DC input terminal and monitor terminal are connected to this circuit. In the drawing, 32 is a head amplifier for distortion signals, 33 is a head amplifier for DC signals, and 34 is a head amplifier for DC signals.
Is a switching contact between a distortion amplifier and a DC amplifier, 35 is an amplifier for 10 times amplification, and 36 is a low pass filter (LPF), and the cutoff frequency can be changed within the range of 10 to 300 Hz. Numeral 37 is a data multiplexer such as a multiplexer, which converts amplified signals of two paths sent from each of the normal scale and 10 times scale amplifier circuits provided in parallel into one path at a predetermined sampling cycle and sequentially outputs them. Is. 38 is an analog-digital converter (A / D),
Reference numeral 39 is a digital-analog converter (D / A), 40 is a buffer amplifier, and 41 is a constant voltage circuit of 2V. D / A
The buffer amplifier is mainly used for executing 0 balance adjustment and calibration after the adjustment. These will be described later.

In the figure, BAL is a 0 balance signal, CA
L is a calibration signal, MON is a monitor signal, and FCLK is a filter clock signal. It should be noted that this circuit can supply a bridge voltage (about 2V) to an external strain gauge or dial gauge through a strain input terminal, and can supply constant power (about ± 12V) to an external accelerometer through a DC input terminal. Is configured. The output from the monitor terminal has a span of about ± 1 V regardless of the amplifier type.

As can be seen from FIG. 3, the signal conditioning section has two different types of amplification paths provided in parallel in the circuit. Then, the output from the sensor is input to each amplification path at the same time, each amplification signal with a different range is A / D converted and stored in the memory, and then the appropriate one is automatically selected by software. It is set to save to a card. Although the range ratio in this embodiment is set to 1:10 for convenience, this value is not limited.

The data recorder of the present embodiment adopts an apparently one-channel and internally two-channel (two-stage simultaneous system) amplifier configuration as described above, so that the range switching operation normally required for data recording is performed. Demonstrate the auto range function that eliminates the need for.

As the type of A / D, for example, a successive approximation type is used, and its sampling cycle is 500 Hz.
The above is desirable. This is because when measuring the vibration of the pier, the natural frequency is about 100 Hz, and it is difficult to obtain an appropriate measured value unless sampling is performed at 500 Hz or higher. On the other hand, the measurement of strain and displacement can be sufficiently performed by sampling at 100 Hz or less. Therefore, in this embodiment, the sampling cycle that can be set by the built-in sample clock is set to 10/50.
/ 100/500/1000 Hz, and the optimum sampling period can be selected according to the measurement item. Furthermore, when connecting multiple data recorders and performing synchronous measurement, it may be necessary to match the sampling cycle.
It has a function of setting the sampling period based on the sampling signal output from the master setting machine.

FIG. 4 is a block diagram of the control unit. The control unit is centered on the CPU and monitors R
OM, program ROM, RAM with two different capacities for data and work, programmable timer (PIT) that functions as a counter or timer, filter clock for LPF (FCLK), sample for setting sampling frequency of A / D A clock (SCLK), a decoder that converts an address signal encoded in binary by a status setting switch / device number setting switch into a decimal number, a real-time clock (R that gives date / time information to recorded data)
TC), interface for connection with host computer (RS422), interface with IC card mounted in recording unit, interface with LCD, sync signal from master setting machine, external trigger signal, etc. are input / output and internal circuit A photocoupler (OPT ISO) that optically insulates and protects against noise mixing, various switches, indicators, buzzers, etc. are connected to the programmable interface (PP) for parallel processing of signals.
I) and the like. The CPU, each of the above devices, and the above-described signal adjusting unit are connected by a CPU bus (BUS) so that information can be transmitted bidirectionally.

Next, of the various functions of the data recorder of the present invention, particularly important functions will be described. (Level trigger function) When a signal having a magnitude exceeding a certain level is input, this is a trigger to automatically start data recording. Specifically, the magnitude of the input from the sensor is constantly monitored and compared with a value (trigger level) preset by the CPU of the control unit, and if the value exceeds the trigger level, the trigger is triggered. Then, recording is started and the input signal is recorded as data in the IC card. The trigger level is set to the maximum range of X. It is possible to determine directly like X%.

(Auto Trigger Leveling Function) In order for the level trigger to function, it is necessary to set the trigger level in advance. However, if the set value of the trigger level is too small, triggering may occur due to noise, and if the set value is too large, the appropriate data may not be recorded or even no data may be recorded. It is very inconvenient to perform automatic recording of. Therefore, by reading the noise input for a certain period of time during normal times without phenomena such as passing trains, the maximum value of them is used as the base noise, and a function to automatically set the trigger level based on this base noise is provided.
The automatic recording of data was ensured and started properly. Specifically, the following series of operations is automatically executed. That is, when the start switch is pressed after installing the data recorder together with the sensor at a predetermined location, the noise input at the installation location is measured for a fixed time (about 4 seconds), and the maximum noise input is regarded as the base noise. The trigger level is determined by multiplying the noise by a trigger coefficient that has been set in advance by the condition setting by the IC card or the host computer. The value of the trigger coefficient is desirably variable (for example, in the range of about 1.0 to 3.0), and is usually set to about 1.5. Further, the sampling frequency at the time of measuring the noise level is a fixed value (for example, 1000H
z) or may be variable.

(Pre-trigger function) This is a function of saving the input from the time point when a predetermined time elapses from the time point when the trigger is applied as data. If only the input after the trigger time is used as the data, the input below the trigger level set by the auto-trigger leveling function (called the pre-trigger input) will not be recorded among the inputs based on the running of the train. The input status of is not reflected. Therefore, in the present embodiment, an endless memory having a ring structure that is overwritten at a fixed cycle is adopted in the storage unit, and after the setting of the trigger level is completed, signals input from the sensor in the standby state are sequentially stored in the endless memory. I chose That is, the endless memory keeps a state of always storing the pre-trigger input within a fixed time range. With this function, from the time when the preset time (about 0.1 to 5.0 seconds) is traced back to the time when the preset recording time (1 to 60 seconds) elapses, with the trigger time as a reference. Record the input as data. As a result, since the pre-trigger input and the input after the trigger are recorded together, the entire input generated due to the passage of the train can be used as data, and more accurate measurement can be performed.

(Auto range function) The input signal from the sensor is amplified by the amplifier circuit of the signal adjusting section, and then A /
Although the data is D-converted and stored in the memory, it is necessary to select an appropriate dynamic range (hereinafter, simply referred to as a range) corresponding to the magnitude of the input signal in order to obtain good quality data. In this embodiment, two kinds of amplifiers having different ranges (range ratio 1:10) are provided in parallel in the amplifier circuit (see FIG. 3), input signals from the sensor are simultaneously input to the amplifiers, and outputs from the respective amplifiers. Is converted into one channel through a multiplexer or the like to sequentially perform A / D conversion, and then this is stored in a memory. Then, a mechanism is adopted in which, among the stored data, data that is an appropriate input is automatically selected by the program of the firmware and transferred to the IC card for storage. As a result, it is possible to eliminate the need for range switching, which was conventionally performed manually by an operator based on experience or trial measurement.

(Auto 0 balance function) In measuring a distortion signal, it is necessary to perform 0 balance adjustment in advance. In the present embodiment, the signal adjustment unit (see FIG.
When there is an output of a certain value in A / D, the output of the opposite sign corresponding to that is output by D / A, and this is input to the upstream of A / D and added to obtain A / D. Is set to 0.

(Calibration Function) Calibration (CAL) is a function for confirming the gain of the amplifier circuit itself in order to calibrate the error between the measured value and the true value.
After the 0 balance adjustment, a plurality of specified outputs from the D / A are added to the amplifier circuit, and the A / D output value at that time is read to obtain CAL data. In this embodiment, since the CAL signal is input after each head amplifier for the DC signal and the distortion signal, the same CAL value can be obtained regardless of the amplifier type. After performing the calibration, the value of A / D is adjusted to 0 again. The balance value and the CAL value are recorded in the IC card together with the measurement data.

(Synchronous recording function) When the measurement is performed at a plurality of points, data synchronization may be required. The data recorder according to the present invention is configured as a synchronous recording system by setting one of a plurality of data recorders as a master and the rest as slaves, and wiring the respective synchronous input / output terminals to connect in a multi-drop system. Can be built. The setting of the master and the slave is performed by a state setting switch composed of an 8-dip switch. Also, the setting of the terminal device of the slave setting devices is performed by the status setting switch.

In this system, only the master setting machine has the level trigger function, and when the input signal from the sensor triggers, a synchronous trigger signal is sent to the slave setting machine. The slave setting machine starts data recording in synchronization with the master setting machine based on the synchronization trigger signal received from the master setting machine, and at the same time, sends the synchronization trigger signal to the downstream slave setting machine. When the master setting machine sends a synchronous sampling signal, the slave setting machine records data according to the sampling frequency set by the sample clock of the master setting machine.

When an external trigger is used, this is effective only for the master setting machine, and the master setting machine outputs a synchronous trigger signal matching the external trigger signal to the slave setting machine. On the other hand, since the command trigger by the host computer is effective for both the master and the slave, it is possible to trigger the slave setting machine arbitrarily designated. When a host computer is connected to the master setting machine and a command trigger is applied, a synchronization trigger signal is sent to the slave setting machine.

(Data Date Function) When recording the measurement data on the IC card, the date and time at the time of the trigger are recorded at the same time. As a result, the time when the data is recorded can be known, which makes it easy to determine the data content later, and thus the management and analysis of the data can be efficiently performed.

(Data Recording Confirmation Function) In this embodiment, in order to confirm that the data recording has been reliably performed from a remote position, the trigger indicators 21, 23 (Fig. 1)) and a buzzer 18 attached. The trigger indicators 21 and 23 keep blinking until the data is recorded to the IC card after the trigger is applied, and after the data recording is completed, the buzzer emits an electronic sound for a predetermined time (about 3 seconds).
It is set to ring.

Next, a usage mode of the data recorder according to the present invention will be described. (Application example 1) Deflection (displacement) of bridge girders when passing trains
The case of measuring is described. In this example, it is assumed that recording data does not need to be synchronized. Prior to measurement, set the instrument status with the 8-dip type status setting switch. Then, as shown in FIG.
After the data recorder 10 is installed and fixed at a predetermined measurement location (both fulcrums and central portions of the bridge girder A), the power switch is turned on. Then, the recording condition information and the setting information of the state setting switch recorded in the IC card are read, the internal state is initialized, and the state shifts to the standby state. In this standby state, the recording conditions of the IC card can be changed online by the host computer.

Then, when the start switch is pressed, 0
After the balance adjustment and calibration are automatically executed in sequence, the auto trigger leveling function is activated to determine the trigger level, and then the system shifts to the waiting state for the trigger. During the standby state, the input from the sensor is always stored in the endless memory.

It is also possible to test, before the measurement, whether the recording cycle of the device is successful. This is executed by turning on the power with the check switch turned on. As for the contents of execution, after initializing the internal state, adjusting the 0 balance, calibrating, and determining the trigger level, data is recorded a specified number of times by a self-trigger, and the state shifts to the standby state. In this test,
The recorded data is not stored in the IC card. Also,
The above test can be independently executed in each device regardless of master / slave even in a multi-drop connection.

When a trigger is applied by the passage of a train, the inputs from the trigger time to the elapse of the set recording time are stored in the memory in two ranges, and together with the pre-trigger input in the preset time range before the trigger time, An appropriate range is selected and data is recorded on the IC card.
During this time, the trigger indicator continues to blink, and when the data recording on the IC card is completed, the buzzer sounds an electronic sound to notify the operator. In addition to the measurement data, the IC card has a trigger date and time, data recording conditions,
Balance value and calibration value are recorded at the same time.

When the recording of the data is completed, the 0 balance adjustment and calibration are executed again, and then the standby state for waiting the trigger is entered to prepare for the second and subsequent recording of the data. Before the transition to the standby state, a trigger prohibition time zone of an appropriate length can be provided.

When the data recording for the required number of times is completed in this way, the data recorder is recovered from the installation place. Then, after transferring the recorded data from the IC card to the host computer, if necessary, format conversion is performed and the data is filed in an appropriate storage medium or storage device such as a flexible disk.

(Example 2 of use) This example assumes the case where synchronous data recording is performed by connecting a plurality of data recorders in a multi-drop manner in vibration measurement of a pier when a train passes. Prior to measurement, set the master / slave, the terminal device, and the communication speed (baud rate) using the 8-dip type status setting switch.

Next, as shown in FIG. 6, after the sensor S and the data recorder 10 are installed and fixed at predetermined positions on the surface of the pier B, the synchronous input / output terminals of each data recorder 10 are connected by wiring. At this time, it is desirable that the total length of the wiring does not exceed 50 m.

When the power switch is turned on, the internal state is initialized and the state shifts to the standby state, as in the case of the first use example. The slave setting machine is set so that the level trigger function is turned off and a trigger is applied by the synchronous trigger signal. Further, in principle, the sampling frequency of the slave setting machine is set to be synchronized with the master setting machine by the synchronous sampling signal, but it is not hindered to set each independently.

Then, when the start switch is pushed, 0 balance adjustment and calibration are automatically executed in sequence, and the auto trigger leveling function works only on the master setting machine to determine the trigger level, and then wait for each trigger. Move to the standby state.

When the train is triggered by the passage of the train, the master setting machine starts data recording, and at the same time, sends the synchronous trigger signal and the synchronous sampling signal to the slave setting machine. Each slave setting machine, based on the synchronous trigger signal or this and the synchronous sampling signal,
Start data recording in synchronization with the master setting machine. The input of a predetermined recording time and the pre-trigger input are stored in a memory in two ranges, an appropriate range is selected from the two ranges, and data is recorded in an IC card together with recording conditions and other additional information. During this time, the trigger indicator keeps blinking and the buzzer emits an electronic sound when the data recording on the IC card is completed, as in the case of the first use example.
Further, the situation after the completion of recording is the same as that in the use example 1 described above, and therefore the description thereof is omitted here.

In the above-mentioned usage example, as the kind of trigger, the level trigger is adopted to automatically start the recording when the train passes, but when it is necessary to forcibly start the recording, the external trigger is used. Alternatively, a command trigger by the host computer is used. However, as described above, the external trigger is not effective for the slave setting machine in the case of the multi-drop connection.

The embodiment of the data recorder according to the present invention is not limited to the above-mentioned one, but can be modified appropriately. For example, in terms of hardware, it is conceivable to use a storage medium such as a magnetic disk, an optical disk, a magneto-optical disk, or a magnetic tape as a storage device for the recorded data, in addition to the IC card. Further, the input signal may be recorded as an analog signal instead of being A / D converted. Furthermore, the amplifier section of the signal adjusting section can be made compatible with signals (for example, optical signals) other than distortion signals and DC signals.

On the other hand, in terms of software, all of the numerical values specifically mentioned in the description regarding the setting contents of recording conditions and the operation mode are merely examples, and they may be appropriately changed according to the use situation. It is a thing. Also, C
By allowing the firmware controlling the PU to be changed or improved, the performance can be improved at any time.

In addition, the present invention does not prevent various applications depending on the embodiment.

[0066]

Since the data recorder according to the present invention has a function of automatically connecting to each sensor to record data, it does not require a wire having a long extension distance as in the prior art, and wiring connection is extremely easy. It is simplified. Moreover, since the equipment can be made lighter and smaller, it can be transported, installed and
Handling such as removal becomes easy. As a result, the preparatory work for carrying out the measurement is simplified, so that the work efficiency is improved and the safety can be expected to be improved by shortening the work time.

[Brief description of drawings]

1A and 1B are external views of an embodiment of a data recorder according to the present invention, in which FIG. 1A is a front view, FIG. 1B is a plan view, and FIG. 1C is a rear view.

FIG. 2 is a diagram showing an example of a system configuration of a data recorder according to the present invention.

FIG. 3 is a circuit diagram showing an example of a configuration of a signal adjusting unit in the data recorder according to the present invention.

FIG. 4 is a device block diagram showing an example of a configuration of a control unit in the data recorder according to the present invention.

FIG. 5 is a schematic diagram showing a usage example of a data recorder according to the present invention.

FIG. 6 is a schematic diagram showing a different use example of the data recorder according to the present invention, in the case of constructing a synchronous recording system.

FIG. 7 is a schematic diagram illustrating a conventional measurement situation.

[Explanation of symbols]

 10 data recorder 11 distortion input terminal 12 DC input terminal 13 synchronization input terminal 14 synchronization output terminal 15 external trigger terminal 16 external power supply terminal 17 monitor terminal 18 buzzer sounding part 19 power switch 20 power indicator 21 trigger indicator 22 liquid crystal display (LCD) 23 Trigger indicator 24 Stop switch 25 Start switch 26 Pause switch 27 Check switch 28 Battery loading slot 29 IC card insertion slot 30 Status setting switch 31 Device number setting switch A Bridge girder B Bridge pier S sensor

Claims (10)

[Claims] 1. A battery connectable to a sensor,
A signal conditioning unit that processes a signal input from the sensor, a recording unit that stores the processed signal as data,
A data recorder characterized by being integrally incorporated with a control unit having an automatic data recording start function. 2. The data recorder according to claim 1, wherein the signal adjusting unit is compatible with both a distortion signal and a voltage signal. 3. The data recorder according to claim 1, wherein an IC card is removably attached to the recording section. 4. The data recorder according to claim 1, further comprising display means for displaying that data recording is completed. 5. A weight of 1 kg or less.
Data recorder described in any of 6. An input signal having a magnitude exceeding a certain value is used as a trigger to start recording, and an automatic level trigger function for automatically setting a trigger level with reference to a base noise is provided. The data recorder according to any one of 5. 7. The recording unit has an endless memory function of a ring structure for constantly storing the input from the sensor, and is set to store the input from the time point traced back a predetermined time from the trigger time point as data. Item 7. A data recorder according to any one of items 1 to 6. 8. The signal adjusting unit according to claim 1, wherein at least two amplifiers having different ranges are arranged in parallel, and one of the signals amplified by each amplifier has a proper value and is stored as data. The data recorder described in either one. 9. The other data recorder having a connection terminal to the other data recorder and outputting the synchronization signal to the other data recorder and / or the other data based on the synchronization signal output from the other data recorder. 9. The data recorder according to claim 1, which has a function of performing recording in synchronization with the recorder. 10. The remaining slave setting machine is connected to one master setting machine selected from the plurality of data recorders according to claim 9, and based on a synchronization signal output from the master setting machine, A synchronous recording system characterized in that the remaining slave setting machines are set to record simultaneously with the master setting machine.