Worldsensing Monitoring Solution Glossary

A

Angular distortion – a geotechnical monitoring parameter. Wikipedia

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B

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C

Cloud Gateway – gateway used with CMT Cloud software.

Connectivity – Worldsensing product category which includes gateways, the Connectivity Management Tool and Worldsensing App.

Current loop – a type of analog sensor. Wikipedia

Crack meter – a type of sensor.

Convergence monitoring – a type of monitoring for underground construction / tunnels.

Cant – a rail parameter that may be measured by wireless tiltmeters. Wikipedia

Continuous Sampling – The term we use to describe the way the EDM nodes sample the data. In the case of TIL90E this is @3.9Hz. This is decoupled from the rate we take samples to send via periodic readings (see sampling rate).

Coverage test – an initial test performed to check the quality of the communication between the edge devices and the gateways during installation.

Custom-compacted files – May contain all the raw readings of all the nodes of the network, engineering units, error files; not specific to a node but applies to the whole network so their filenames contain the network ID; .dat files instead of .csv files, but they have the same behavior in terms of being comma-separated files and being monthly generated.

A new file is created every month, having a “current” file with the information related to the current month, and all historical ones stored. At the end of the month, the file is closed, renamed, and a new current file is generated. The oldest files are zipped to save space.

CSV files – A comma-separated values file is a delimited text file that uses a comma to separate values. Wikipedia

CMT Edge – On-premise Connectivity Management Tool, connectivity management software: data, devices and networks.

CMT Cloud – Cloud-based Connectivity Management Tool, connectivity management software: data, devices and networks.

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D

Data server – a server which uses a database application that provides database services to other computer programs or to computers, as defined by the client–server model. Wikipedia

Diaphragm walls – a part of a construction area which may be monitored through sensors. Reference

dBm – Unit to measure the strength of a signal. Visible in sections of the mobile app.

Deformation – vertical/horizontal; change in shape or configuration of a body  that can result in the bending, twisting, stretching and/or elongation of the entire body or part of it. Deformation can just happen on the vertical plane, on the horizontal one or in both.

Displacement – lateral/vertical; movement of a body that can occur along the horizontal plane, along the vertical one or along both planes. It does not imply deformation but both displacement and deformation might occur when the body is under stress.

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E

Edge devices – Worldsensing wireless data loggers, digital loggers and wireless sensors. Wikipedia

Edge computing – network architecture used by the CMT Edge software. Since it is embedded in the gateway, it brings computation and data storage as close to the point of request as possible in order to deliver low latency and save bandwidth. Reference

Edge Gateway – gateway used with CMT Edge software.

Extensometer – a type of analog sensor. Wikipedia

Ethernet – Typically, Ethernet cables are used to provide an internet connection, connect devices to a local network. Wikipedia

Encryption password – random password used to encrypt the communication between the data loggers and the CMT Cloud software.

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F

FTP – protocol  option for the CMT Edge software. Wikipedia

FTPS – protocol  option for the CMT Edge software. Wikipedia

Full Wheatstone Bridge – a type of analog sensor. Wikipedia

Firmware – a specific class of computer software that provides the low-level control for a device’s specific hardware, such as gateways or data loggers.  Wikipedia

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G

Gateway – Device that collects and processes the data from the edge devices and sends it to the Connectivity Management Tool. In the case of CMT Edge, the software is embedded in the gateway.

Ground anchor – a type of analog sensor. Wikipedia

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H

HTTP API calls – data integration option for the CMT Cloud software. Wikipedia

Horizontal displacement – a geotechnical monitoring parameter. Reference

Heave – horizontal displacement especially by the faulting of a rock.

Health files – contains the battery, internal temperature and node uptime data of the Worldsensing edge devices.

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I

In-place inclinometer – a type of sensor compatible with digital loggers. Wikipedia

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J

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K

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L

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Lateral deformation – or lateral strain, it refers to the ratio of the change in dimension of a body to its original dimension along the longitudinal direction.

LoRa – stands for Long Range communication based on IoT (Internet of Things) technology. Wikipedia

Load cell – a type of sensor. Wikipedia

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M

MODBUS TCP – data integration option for the CMT Edge software. Wikipedia

MQTT – data integration option for the CMT software. Wikipedia

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N

Network ID – network identifier found on the gateway information sheet.

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O

Online – an update/configuration process while the device is connected to the Internet.

Offline setup/configuration – an update/configuration process while the device is NOT connected to the Internet.

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P

Periodic Reading – data which is gathered at synchronous intervals defined by configuration.

Piezometer –  a type of sensor. Wikipedia

Pore water pressure – a geotechnical monitoring parameter. Wikipedia

Potentiometer – a type of analog sensor. Wikipedia

PT100 – a type of analog sensor. Wikipedia

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Q

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R

Radio message – one single transmission from the edge device to the gateway or from the gateway to the edge device. To transmit a reading, one (e.g. wireless tiltmeter) or more radio messages (e.g. digital logger connected to a dozen of in-place inclinometers) can be required. Furthermore, several copies are sent (3, by default), to increase message reception probabilities. CMT systems identify the copies as one single reading.

Rain gauge – a type of analog sensor. Wikipedia

Reading – complete data from a certain timestamp; a line in the Readings CSV file. Depending on the sensor type, the reading can directly be a single sample of the sensor or can be the result of averaging a set of measurements.

Reporting Period – time between two acquisitions of synchronous readings.

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S

Sample – one single measurement of the sensor.

Sampling rate – number of times information from a sensor (sample) is collected per unit of time. In other cases this would be given in Hz, but given that in the Worldsensing Monitoring Solution, frequencies are small (for example, 0.00027 Hz is once every hour), it is used interchangeably as Sampling period.

Sampling period – time between two sensor information collections. (1/Sampling rate). It is used interchangeably as Sampling rate.

Strain gauge – a type of sensor. Wikipedia

Star topology – network topology which is not affected by radio signal obstructions, does not need repeaters or network planning and is not critical path dependent. Wikipedia

Settlement –  a geotechnical monitoring parameter. Reference

SF – Spreading Factor. The spreading factor (SF) impacts the communication performance of LoRa, which uses an SF between 7 and 12. A larger SF increases the time on air, which increases energy consumption, reduces the data rate, and improves communication range.

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T

Thermistor – a type of sensor.  Wikipedia

Twist – a parameter related to rail track geometry that may be measured by wireless tiltmeters. Wikipedia

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U

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V

Vibrating Wire – a type of sensor. Wikipedia

Voltage sensor – a type of analog sensor. Reference

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W

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X

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Y

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Z