JP2000065606A - Method and apparatus for checking sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for checking a sensor whereby the sensor can be identified in a simple constitution, thereby eliminating the fear of wrong connection. SOLUTION: Physical elements 81,..., 8n having different physical constants are added preliminarily to a plurality of sensors 21,..., 2n respectively. The physical constants of the physical elements 81,..., 8n are detected by an identifying device 5 connected to the sensors 21,..., 2n, so that the sensors 21,..., 2n are specified or identified from a difference of physical constants.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor confirmation method and a sensor confirmation device for identifying or identifying a sensor.

[0002]

2. Description of the Related Art When a plurality of sensors are connected to an analyzer via a cable or the like, the sensors may be erroneously connected because identification of the sensors is difficult. In particular, when the shapes of the sensors are similar, the possibility of erroneous connection increases.

[0003] Examples of connecting a plurality of such sensors are disclosed in Japanese Patent Publication No. 2-1249 (Prior Art 1) and Japanese Patent Laid-Open Publication No. Hei 4-12291 (Prior Art 2). In Conventional Techniques 1 and 2, ground vibrations are detected by a plurality of vibration sensors, and a phase velocity for each frequency is obtained from the positional relationship between the ground vibrations and the vibration sensors to estimate the ground structure.

In estimating the ground structure, it is necessary to accurately know the phase velocity of each frequency of the ground vibration. In order to measure the phase velocity at each frequency, it is necessary for the vibration from the vibration source to be detected with a sufficient signal-to-noise ratio at each frequency, and the position information of the vibration sensor must be erroneously detected. Must be obtained without.

[0005]

In such prior art, when the number of vibration sensors increases, erroneous connection occurs, for example, the vibration sensor No. 2 is connected to the cable No. 1 which should normally connect the vibration sensor No. 1. The likelihood is high. If this erroneous connection is made, information from the vibration sensor No. 2 is calculated as information from the vibration sensor No. 1 with an incorrect positional relationship, and a correct result may not be obtained.

In addition, the sensors have slightly different characteristics, and when these characteristics are corrected by signal processing corresponding to each sensor, an erroneous connection can be a fatal mistake. . Here, having characteristics means that the sensor has a specific constant such as a natural frequency when the sensor is a vibration sensor. As an example of a vibration sensor,
In the sensor that detects the vibration by the vibration of the coil present in the magnetic field, or by the vibration of the magnet in the coil,
The value of the coil differs depending on the size, linearity, material, temperature and the like. Therefore, even when the vibration is the same, characteristics unique to the vibration sensor occur in the electrical conversion value of the vibration. The characteristic characteristic of the vibration sensor is the characteristic frequency.

[0007] Even when other sensors are used, it is difficult to construct an identical sensor due to variations in the mechanical size and electrical characteristics of the sensors. It has the following characteristics.

For this reason, conventionally, it has been necessary to assign a number to each of the sensor, the cable, the detector, and the signal amplifier, and to connect them while checking the numbers at the time of connection.

An object of the present invention is to solve the above-mentioned conventional problems. It is an object of the present invention to provide a sensor confirmation method and a sensor confirmation method that can identify a sensor with a simple configuration and eliminate the risk of erroneous connection. It is to provide a device.

[0010]

According to a first aspect of the present invention, there is provided a method for checking a sensor, comprising adding a physical element having a different physical constant to each of a plurality of sensors in advance and connecting the sensors to the sensors. The identification device detects a physical constant of the physical element, and specifies or identifies a sensor based on the difference in the physical constant.

According to a second aspect of the present invention, there is provided a sensor confirmation apparatus for detecting a plurality of sensors, a physical element added to each sensor and having a different physical constant for each sensor, and a physical constant of the physical element. And an identification device for identifying the sensor based on a difference in constant.

The above-mentioned physical constants include, for example, electrical values such as resistance and reactance, optical wavelengths such as a wavelength passing through an optical filter, and acoustic frequencies such as the pitch of a whistle. And refers to a value that is physically measured.

The above-mentioned physical element is an element having the above-mentioned physical constant, and is not limited to an electrical physical element. For example, a resistor, a capacitor, a coil, a resonator, a transistor, a diode, an integrated circuit, an optical filter, an acoustic device, and the like can be given. The structure is simple and preferable.

[0014]

According to the sensor confirmation method of the first aspect, a physical element having a different physical constant is added in advance to each of a plurality of sensors, and an identification device connected to the sensor adds the physical element to the sensor. By detecting a physical constant, a sensor can be specified or identified from the difference in the physical constant. Therefore, each sensor can be individually identified, and it can be confirmed without error whether the sensor is connected.

According to the sensor confirmation device of the second aspect,
The identification device can detect the physical constants of the physical elements added to the sensors, and can identify the sensors based on the difference in the physical constants. Can be obtained without error.

[0016]

Next, embodiments of the present invention will be described with reference to the drawings.

This embodiment relates to a method and an apparatus for detecting vibration waves with a plurality of vibration sensors and estimating the layer structure and characteristics of the ground, and is an example in which it is difficult to identify the sensors. FIG.
FIG. 1 is an explanatory diagram showing an installation state of a ground vibration detecting device to which an embodiment of the present invention is applied. FIGS. 2A and 2B are circuit diagrams for sensor identification of a vibration sensor according to the present invention composed of electrical and physical elements. FIG. 2A is a circuit diagram of a four-wire system, and FIG. It is a circuit diagram in case of a formula.

In FIG. 1, the sensor confirmation device is a part of the ground vibration detecting device 1, and detects the vibration of the ground G and also has physical elements 81,...
, 2n, and the identification device 5. Further, the sensor confirmation device is provided with an exciter 10 for applying vibration to the ground and an analysis device 4 for estimating a ground structure by obtaining a phase velocity and a dispersion characteristic for each frequency from a positional relationship between the ground vibration detected by the vibration sensor and the vibration sensor. In addition, the ground vibration detecting device 1 is added.

The exciter 10 is a device that is installed on the ground G to be investigated and generates vibration waves on the ground G by a reciprocating motion of a weight or the like. Also, the vibration sensors 21,.
2n detects a vertical component of ground vibration and converts it into an electric signal. For example, an acceleration sensor, a speed sensor,
And a displacement meter. The detected vertical component signal of the ground vibration is input to the analyzer 4 via the signal cables 611,..., 61n. Also, the vibration sensor 21,.
., 2n are installed on a straight line of the ground G at predetermined intervals.

The analyzer 4 amplifies the input vertical component signal, performs A / D conversion, performs filter processing, and performs FFT.
(Fast Fourier Transform) is performed, and then the coherence and phase difference between the vibration sensors are obtained from the analysis result and the positional relationship between the vibration sensors 21,. Then, an inverse analysis using the inversion method is performed on the dispersion characteristics thus obtained, and characteristics such as the layer structure and properties of the ground G to be investigated are estimated. In addition, it is possible to control the start of the input of the sentence from the vibration sensor.

In the analysis device 4, the vibration sensor 2
, 2n are determined in what kind of positional relationship they are arranged on the ground G, and then the characteristics of the ground are estimated. Therefore,
If the vibration sensor is incorrectly connected to the analysis device 4, the analysis device 4
Causes misrecognition of the arrangement of the vibration sensor. For example, if the vibration sensor 22 is connected to the signal cable 611 and the vibration sensor 21 is connected to the signal cable 612, the analysis device 4 transmits information from the vibration sensor 21 to the vibration sensor 2.
2, the information from the vibration sensor 22 is recognized as the information from the vibration sensor 21, and the phase velocity and the dispersion characteristic are obtained with an incorrect positional relationship.

Next, a method and an apparatus for confirming a sensor for preventing such a problem will be described. The sensor checking device detects the above-mentioned vibration sensors 21,..., 2n, physical elements 81,..., 8n added to these vibration sensors and having different physical constants for each sensor, and detects these physical constants. The identification device 5 identifies the sensor based on the difference in the physical constant.

The physical elements 81,..., 8n are, for example, resistors and capacitors, and have different resistance values and capacitances as physical constants. FIG. 2A shows the physical element 8.
(B) shows a circuit diagram when the physical element 8 is a capacitor. Also, physical elements 81,.
, 8n are connected to the identification device 5 via identification cables 621,..., 62n.

The identification device 5 includes each identification cable 621,
, 62n are assigned in the memory to different physical constants, respectively, and the sensor is correctly connected by comparing the physical constants in the memory with the physical constants of the detected physical elements. Whether or not C
The PU is adapted to determine. This determination result is displayed on the display unit 51, and the operator can determine at a glance whether the sensor is correctly connected to each cable. When all the connections are correctly made, the analysis device 4 starts measurement and analysis of ground vibration based on this determination.

In this embodiment, the analysis device 4 and the identification device 5 are described separately, but most of these functions are processed by a computer system.

Next, a specific circuit configuration will be described with reference to FIG. (A) is a circuit diagram in the case where a resistor R is used as the electrical physical element 8. The vibration sensor 2 includes a sensor main body 2A and a resistor R. The sensor main body 2A is connected to the analyzer 4 via a signal cable 61, and the resistor R is connected to the identification device 5 via an identification cable 62. or,
The resistance value of the resistor R is different for each vibration sensor.

The identification device 5 has a current detector 52 composed of an ammeter and a constant voltage source 53, each of which is connected in series with the resistor R. Therefore, the resistance R
When a constant voltage is applied to the sensor, the current can be detected by the current detection unit 52. However, since the resistance value differs depending on the sensor, the current value also differs, and the sensor is identified as described above by comparing this current value. Can be.

The vibration sensor 2 has a different resistance R for each sensor, such as 1 kΩ for the sensor 1 and 2 kΩ for the sensor 2. Has been added.

FIG. 2 is a circuit diagram in the case where a capacitor C is used as the electrical physical element 8. The vibration sensor 2 includes a sensor body 2A and a capacitor C, and the sensor body 2A and the capacitor C are connected in parallel.
The capacitance of the capacitor C is different for each vibration sensor. Further, the internal structure of the sensor main body 2A is the same for a plurality of vibration sensors used.

The identification device 5 has a voltage detector 54 composed of a voltmeter and a constant current source 55, which are respectively connected in parallel to the capacitor C. Therefore,
When a constant current is applied to the capacitor C, the voltage can be detected by the voltage detection unit 54. However, since the capacitance differs depending on the sensor, the voltage value also differs, and the sensor is identified as described above by comparing this voltage value. be able to.

The vibration sensor 2 has a different capacitor C for each sensor.
F, a physical element such as 2 mF..., Which is clearly different from the sensor 2, is added to the sensor 2. The constant current source 55 may be either AC or DC. However, if the sensor main body 2A has a coil, AC is preferable.

The vibration sensor 21 having a physical element added thereto,
, 2n to the sensor confirmation device 5, the analysis device 4, etc., are preferably connected by one cable and one connector. The cable from the sensor may be any of a four-wire, three-wire, and two-wire type. In the case of the four-wire type, as shown in FIG. To 2
Two lines are used for line and physical element identification. In the case of a three-wire system, one vibration signal line and one line for physical identification are shared. In the case of the two-wire system, the physical element for identification and the sensor are connected in parallel or in series as in the example of FIG. In the case of the two-wire system, the cost can be reduced, and the configuration is simple and preferable.

When a resonator is used as a physical element and connected in parallel, the vibrator can be almost electrically ignored at the frequency of the vibration signal. When the vibrator is identified, if the vibrator is excited at the resonant frequency of the vibrator, the vibrator resonates at a unique resonance frequency, whereby the sensor can be identified. Further, it is preferable that the resistor R and the capacitor C can be attached and detached so as to be changed to another one.

Although the preferred embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the above-described preferred embodiments, and a design change or the like may be made without departing from the scope of the present invention. Even if present, it is included in the present invention. As a physical element for sensor identification, for example, a whistle, which is one of acoustic devices, sends air to a whistle installed in the sensor by a blower (not shown). The whistle generates a peculiar frequency by the sent air, and the sensor can be identified by detecting the frequency of the sound by the sensor confirmation device.

When an optical filter is used as a physical element, white light is sent to the sensor through an optical fiber, and the sensor is identified from the wavelength of the light that has passed through the optical filter and returned to the sensor confirmation device. can do.

In the case where an integrated circuit is used as a physical element, for example, a sensor identification device recognizes a unique signal waveform or a response of a bit string of 0 or 1 for each sensor to specify or identify the sensor. can do.

In the present embodiment, the ground G
Although a vibration wave is generated in this case, a natural phenomenon such as ebb and flow of the tide, plate movement, and a vibration wave which is always a slight movement due to traffic or a factory may be used. Also, the vibration sensors 21,.
Although 2n are arranged on a straight line, they may be arranged at regular intervals on the vertices or circumference of a polygon.

[0038]

According to the sensor confirmation method of the first aspect, a physical element having a different physical constant is added in advance to each of the plurality of vibration sensors, and the identification device connected to the vibration sensor provides Since the physical constant of the physical element is detected and the sensor is specified or identified based on the difference in the physical constant, the sensor can be confirmed without error.

According to the sensor checking device of the second aspect,
A plurality of sensors, a physical element added to each sensor and having a different physical constant for each sensor, and an identification device that detects a physical constant of the physical element and identifies the sensor from the difference in the physical constants, , It is easy to identify each sensor.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an installation state of a ground vibration detecting device for explaining a method of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a circuit diagram including physical elements for sensor identification in the sensor of the present invention. FIG. 2A is a circuit diagram of a four-wire system using a resistor R as a physical element. FIG. 2B is a circuit diagram of a two-wire system using a capacitor C as a physical element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground vibration detecting device 2, 21,..., 2n Vibration sensor 2A Vibration sensor main body 4 Analyzer 5 Identification device 51 Display unit 52 Current detecting unit 53 Constant voltage source 54 Voltage detecting unit 55 Constant current source 6 Cable 61, 611 61n Identification cable 62, 621,... 62n Signal cable 8 Physical element R Resistance C Capacitor 10 Shaker G Ground

Claims (2)

[Claims] 1. A physical element having a different physical constant is added in advance to each of a plurality of sensors, and a physical constant of the physical element is detected by an identification device connected to the sensor. A sensor confirmation method characterized by identifying or identifying a sensor from a difference. 2. Detecting a plurality of sensors, a physical element added to each sensor and having a different physical constant for each sensor, and a physical constant of the physical element, and identifying the sensor based on a difference in the physical constants. And an identification device that performs the operation.