Measurement is an estimation of a quantity or a distance based upon the systematic application of a standardized procedure or device and application of the result. Measurement is to determine the size of something and assign a number to it, such as 100kg and 10kg. The object includes length (angle, toughness), strength (weight, stress), time (frequency, vibration, and noise), fluid (pressure, water level), electromagnetism (resistance, voltage), energy (temperature, work), component (humidity, gas component, and density), etc.
"Frequently-used terminologies"
error
The difference between the measured value and the true value.
correction
A quantity that is added or subtracted in order to increase the accuracy of a scientific measure.
calibration
The process of adjusting an instrument or compiling a deviation chart so that its reading can be correlated to the actual value being measured.
precision
A measure of mutual agreement among individual measurements of the same property, usually under prescribed and similar conditions.
sensitivity
The minimum detection limit of an assay.
accuracy
Degree of conformity of a measure to a standard or true value.
Civil engineering is designed on the basis of the results of restricted ground investigation and soil tests. However, real actions of the ground during civil engineering work can be different from the values estimated during designing.
By checking real actions through measurement, it is possible to evaluate new theories and to improve existing designing methods.
By analyzing the results of measurement, it is possible to prevent unexpected risks. Therefore, measurement aims at safe and economic construction. The concrete goals of measurement are as follows.
Measuring Instruments, for convenient use, should be simple rather than complicated, should be a mechanical type rather than an electric, and should be composed of fewer working parts rather than more. In the event that a measuring instrument is out of order or has an error, the whole measurements through it become useless or desirable data can't be obtained so it is better to install more units of measuring instruments than planned in order to get data of good quality.
Check List
Precision, repeated precision, sensitivity, measuring range, and reliability of measuring instruments should be suitable for the goals of measurement.
The structure should be simple, strong, and easy to install.
The price of measuring instruments should be reasonable
The calculation and analysis process for measurements should be simple.
Connecting pipes or cables for a measuring instrument and a terminal should be durable against physical and chemical actions.
Measuring instruments should be able to overcome any corrosion or electric obstacles.
GEOGAGE
Head Office • Plant 1 : 46, Sasang-ro 375beon-gil, Sasang-gu, Busan, Daedong Instruments Co., Ltd.
Plant 2 : 263-75, Sangdong-ro, Sangdong-myeon, Gimhae-si, Gyeongsangnam-do
Tel : 051-301-5069, Fax : 051-302-5069
E-mail : geogage@geogage.com
Copyright © 2024 GEOGAGE. All rights reserved.
GEOGAGE
Head Office • Plant 1 : 46, Sasang-ro 375beon-gil, Sasang-gu, Busan, Daedong Instruments Co., Ltd.
Plant 2 : 263-75, Sangdong-ro, Sangdong-myeon, Gimhae-si, Gyeongsangnam-do
Tel : +82-51-301-5069 Fax : +82-51-302-5069 E-mail : geogage@geogage.com
Copyright © 2024 GEOGAGE. All rights reserved.
