JPH0882678A - Network system for displacement measurement using lightwave rangefinder - Google Patents

Abstract

(57) [Summary] [Purpose] To enable highly accurate multipoint automatic measurement in a displacement measurement system using a lightwave distance meter economically and to contribute to safety management at construction sites. A lightwave distance meter for preserving measurement data continuously output from the lightwave distancemeters A1 to An by statistical processing and holding the measurement data, and supplying an operating power to the lightwave distance meter. The data terminal devices T1 to Tn installed in a one-to-one correspondence are connected to a plurality of the data terminal devices through the multiple connection type communication line N, and the measurement data from the data terminal devices are sequentially received, While holding
A line control device C that performs operations in response to various requests from the central processing unit E, and a transmission command is issued to the line control device to receive and process the measurement data held in the line control device. Central processing unit E.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a displacement measuring system in the fields of civil engineering and construction.

[0002]

2. Description of the Related Art When constructing large-scale structures such as roads, railroads, water and sewage systems, gas and power lines, or large-scale structures such as buildings and underground malls, existing structures are often located close to the construction site. It exists and there are many opportunities for close construction.

In such a case, when actually constructing a new structure, the displacement and earth pressure of the existing structure and the surrounding ground are constantly measured and compared with the control value to confirm the safety while performing the construction. I will proceed.

Various behavior measuring means are used to secure the soundness of such existing structures. With the progress of electronics technology, light waves and computers are applied to the measuring means in the field of civil engineering and construction. These measuring means have become widespread.For example, at the point where you want to measure the distance, an optical distance meter and a prism that use the phase comparison method that utilizes the fact that the velocity of electromagnetic waves in the atmosphere is almost constant are installed. However, there is a displacement measurement system that outputs a measurement value after inputting and processing the measurement result as an electric signal in a computer.

[0005]

[Problems to be Solved by the Invention] When measuring behavior for ensuring the soundness of an existing structure during construction, for example, when measuring a change in distance between bridge piers of an viaduct which is an existing structure, at present, in real time. In addition, there is no measuring means that can perform highly accurate multi-point automatic measurement, and when measuring the distance variation between the piers of the viaduct using a conventional optical distance meter, there are the following problems. There is. (1) When the object to be measured is a large-scale (wide-range) structure and it is necessary to install and measure many lightwave rangefinders, the external output unique to the lightwave rangefinder is a serial interface (for example, RS-232C). For this reason, the connection distance is restricted due to factors such as reduced output, there is no network function, and the interface expansion on the personal computer side is restricted by the number of channels (up to 3 to 4 channels). Is difficult to build. (2) The nominal measurement accuracy of the lightwave rangefinder itself is ± (5mm + 3
ppm). Therefore, the output raw data itself has errors and variations of about the nominal accuracy, and it is not possible to obtain highly accurate measurement results. Therefore, when the statistical processing of the measurement data is performed on the side of the central processing unit (host computer) in order to improve the accuracy, the load on the side of the host device increases and the processing speed becomes slow. (3) The power supply of the lightwave rangefinder is the external adapter (AC
/ DC adapter). Therefore, when the lightwave distance meter is used outdoors, AC100V power supply and curing (a weatherproof cover etc.) such as an AC / DC adapter and a power cable are required for each lightwave distance meter. (4) Since the lightwave rangefinder does not have a reset function when the built-in computer runs out of control, it is necessary to restore the normal operation by shutting off the power of the lightwave rangefinder and re-energizing it at the time of runaway. Therefore, if the computer built into the lightwave rangefinder goes out of control, it cannot be reset by remote control.

An object of the present invention is to solve the above-mentioned problems relating to real-time, multi-point automatic measurement in a displacement measuring system using a light-wave distance meter, to enable highly accurate multi-point automatic measurement economically, and to ensure the safety of construction sites. It is to contribute to management.

[0007]

In order to achieve the above object, the present invention provides a method for preprocessing and holding measurement data which is continuously output from a lightwave distance meter by statistical processing, and at the same time, the lightwave distance is measured. A data terminal device that supplies operating power to the meter and is installed in a one-to-one correspondence with the lightwave distance meter, and is connected to the plurality of data terminal devices through a multiple connection type communication line to obtain the data. By sequentially receiving and holding the measurement data from the terminal device, and performing the operation according to various requests from the central processing unit, and by issuing a transmission command to the line control device, A central processing unit for receiving and processing the measurement data held in the line control unit.

[0008]

In the present invention, the data terminal device receives the measurement data of the corresponding optical distance meter at all times, pre-processes the data by statistical processing, and holds the data, thereby performing measurement without imposing a load on the central processing unit. By correcting the errors and variations and controlling the power supply of the lightwave rangefinder, it automatically returns to normal operation when the microcomputer with the built-in lightwave rangefinder is abnormal. In addition, one line control device is connected to a large number of data terminal devices via the multiple connection type communication line on the one hand, and is connected to the central processing unit on the other hand, and the latest measurement from all connected data terminal devices is performed. The data is always held and multi-point displacement measurement data is returned in real time in response to a data request from the central processing unit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a displacement measuring network system using an optical distance meter, which is an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of a network terminal as a data terminal device. FIG. 3 is a diagram showing a configuration of a network controller which is also a line control device.

FIG. 4 is a schematic diagram of displacement measurement of bridge piers by multi-point automatic measurement, and FIG. 4 (a) is a diagram showing a pattern in which bridge piers of an expressway are continuously lined up. b)
4A is a cross-sectional view taken along the line aa ′ in FIG. 4A, in which an optical distance meter A and a prism B are installed as a pair on adjacent piers at the top end of the highway bridge pier, respectively, and at a substantially constant distance interval. It shows that the distance between many piers standing side by side is constantly measured at multiple points to measure the behavior of piers in close construction.

In FIG. 1, each lightwave rangefinder A1, A2,
A3, A4, A5. ． ． An is an optical distance meter A1 to A.
network terminals T1, T2, T3, T4, T5., which are data terminal devices equipped with statistical processing means for pre-processing raw data measured by n. ． ． Each Tn is connected in a one-to-one manner.

Raw data output from the lightwave rangefinders A1 to An are affected by noise, and mechanical and electrical errors and variations occur, and the raw data has low reliability as measurement data. Therefore, each network terminal T that receives the raw data from the lightwave rangefinders A1 to An and transmits the raw data to the network controller C that is the line control device.
In 1 to Tn, the mechanical / electrical error and the variation of the measurement values in the lightwave rangefinders A1 to An, which are included in the raw data output from the respective lightwave rangefinders A1 to An, are smoothed by statistical processing and measured. A microcomputer (see FIG. 2) for improving the accuracy of values is mounted.

As a concrete statistical processing method, a moving average process, an intermediate value process, and a simple average process are performed by judging the condition of raw data (installation environment of the lightwave rangefinders A1 to An).

As shown in the configuration diagram of the network terminal (hereinafter referred to as FNT in the figure) in FIG. 2, the connection between the network terminal and the lightwave distance meter A1 (A2 to An is the same) is the connector C.
A general-purpose serial interface, for example, RS-232C is incorporated as an interface. In addition, each network terminal T1
The Tn is connected to the network controller C by a common bus type network (multiple connection type communication line) N. As this interface, for example, RS-4
85 is incorporated. This bus type network N
Is similar to a bus type network used conventionally, and in the embodiment of the present invention, 32 network terminals T1 to Tn can be connected from one network controller C to each four-core communication line. Maximum 6
Line x 32 = 192 network terminals T1
~ Tn (ie, lightwave rangefinders A1-An) can be connected thereto. The operating power supply of the lightwave rangefinders A1 to An is supplied from the power supply device via the reset circuits of the network terminals T1 to Tn and the connector CN.

The network controller C shown in FIG.
Is the latest measurement data measured by each of the lightwave rangefinders A1 to An that are constantly connected and statistically processed by each of the network terminals T1 to Tn, sequentially from each of the network terminals T1 to Tn.
And is stored in the memory (see FIG. 3) built in the network controller C. Then, according to various commands from the central processing unit (host computer) E installed in the construction site office, the corresponding operation, for example, transmission of measurement data from all connected network terminals T1 to Tn, , While transmitting only the measurement data from the network terminals T1 to Tn having the designated numbers, and sending an instruction from the central processing unit E to each of the network terminals T1 to Tn.
Relay to. In addition, the network terminals T1 to Tn
As an interface opposed to, for example, RS-4
85 and RS-232C are respectively incorporated as interfaces facing the central processing unit E.

Next, a basic measuring procedure of the displacement measuring network system using the optical distance meter, which is an embodiment of the present invention, will be described. (1) Initial setting of the network terminals T1 to Tn:
A command to set the statistical processing mode and conditions is sent to the central processing unit E → network controller C → each network terminal T1 to Tn. (2) Response of network terminals T1 to Tn: After each network terminal T1 to Tn receives the setting command,
Completion of measurement preparation for each network terminal T1 to Tn →
Network controller C → responds to central processing unit E,
Correct if measurement preparation is not possible. (3) Raw data measurement: Each lightwave rangefinder A1 to An constantly measures raw data, and this is measured by each network terminal T.
1 to Tn are continuously transmitted (dripping). (4) Statistical processing and retention of measurement data: Each network terminal T1 to Tn is connected to each lightwave rangefinder A1 to An.
The raw data from is processed by the set statistical processing mode and then retained as measurement data. (5) Data request command: A measurement data request command is issued to the connected network terminals T1 to Tn from the network controller C to each network terminal T.
Sequentially transmitted to 1 to Tn. (6) Transmission of measurement data: Each network terminal T
1 to Tn → Transmits measurement data to the network controller C, collects and holds the latest measurement data of the network terminals T1 to Tn connected to the memory of the network controller C.

FIG. 5 shows each network terminal T1.
It is a flowchart which shows operation | movement of Tn (FNT), while performing the operation | movement corresponding to the above-mentioned procedure, as shown in step 5, when continuous data from the lightwave rangefinders A1-An are interrupted, or it becomes a pair. When an abnormality occurs in the lightwave rangefinders A1 to An, such as when the microcomputer built in the lightwave rangefinders A1 to An runs away, this is caused by the countout (hangup) of the known watch dog timer. Is detected and the power supplied to the lightwave rangefinders A1 to An is turned on / off to automatically reset the lightwave rangefinders A1 to An. Note that FIG.
In ~ 6, FNC represents a network controller.

FIG. 6 is a flowchart showing the operation of the network controller C (FNC). When the network controller C is powered on in step 1, the microcomputer is autonomously connected in step 3. Each network terminal T1 to Tn
Sequential polling (data request) for up to 192 units
The latest measurement data returned from each network terminal T1 to Tn
Held in the internal memory (see FIG. 3) as a data variable, and in step 4, the microcomputer performs various operations according to each instruction from the central processing unit E.
In step 5, if there is no response from a certain network terminal, an error code is set in the memory (RAM).

The network terminal to which the error code is set is also polled every time, and when the response from the network terminal is restored again, the correct data is written in the data variable of the memory (RAM). Data management of the network terminals T1 to Tn is performed.

The following is used as an example of each setting command of this system. Hard reset all network terminals (FNT) and network controllers (FNC). Resets the specified number of FNT. Data statistical processing is set for all FNTs. Sets the data statistical processing on the specified number of FNT. Send data from all connected FNTs. Send data from the specified number of FNT. Send the FNT mode with the specified number.

As an example of the response to each command,
The following is used. Processed the received instruction correctly. The format of the received command is different, or the parameter is not the specified value and cannot be processed. The FNT with the specified number does not exist. The measurement data has not been prepared yet. It is measurement data. The measurement data has been sent.

[0022]

As described above, according to the present invention,
The measurement data that is always continuously output from the lightwave rangefinder is preprocessed by statistical processing and held, and operating power is supplied to the lightwave rangefinder, which is in one-to-one correspondence with the lightwave rangefinder. Connected to a plurality of the data terminal device via a multiple connection type communication line, and sequentially receives measurement data from the data terminal device,
Receives the measurement data held in the line controller by holding it and issuing a transmission command to the line controller that performs operations in response to various requests from the central processing unit.・ It is equipped with a central processing unit for processing, so that the data terminal device receives the measurement data of the corresponding optical distance meter at all times, and pre-processes it by statistical processing to hold it It corrects measurement errors and variations without applying load and controls the power supply of the optical rangefinder so that it automatically returns to normal operation when the microcomputer equipped with the optical rangefinder is abnormal. The line controller of
On the one hand, a large number of data terminal devices are connected via a multiple connection type communication line, and on the other hand, they are connected to the central processing unit,
The latest measurement data from all connected data terminal devices is always retained, and in response to a data request from the central processing unit, multi-point displacement measurement data is returned in real time, so highly accurate multi-point automatic measurement Economically possible and can contribute to safety management at the construction site.

[Brief description of drawings]

FIG. 1 is a diagram showing a displacement measuring network system using a lightwave distance meter, which is an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a network terminal in the same manner.

FIG. 3 is a diagram showing a configuration of a network controller in the same manner.

FIG. 4 is a schematic diagram of displacement measurement of a pier by multipoint automatic measurement.

FIG. 5 is a flowchart showing the operation of the network terminal.

FIG. 6 is a flowchart showing the operation of the network controller.

[Explanation of symbols]

A, A1, A2, A3, A4, A5. ． ． An optical distance meter B prism C network controller (line control device) CN connector E central processing unit N multiple connection type communication line (bus type network) T1, T2, T3, T4, T5. ． ． Tn network terminal (data terminal equipment)

Claims (1)

[Claims] 1. A displacement measuring system using a light wave range finder, wherein measurement data continuously output from the light wave range finder is pre-processed by statistical processing and held, and the light wave range finder is A data terminal device that is installed in a one-to-one correspondence with the lightwave distance meter that supplies operating power, and is connected to a plurality of the data terminal devices via a multiple connection type communication line. The line control device that sequentially receives and holds the measurement data of the line control device, and that performs an operation according to various requests from the central processing unit, and issues a transmission command to the line control device. A network system for measuring displacement using a lightwave rangefinder, which includes a central processing unit that receives and processes the measurement data stored in the.