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Uncertainty in Measurement: Accuracy and Precision

Uncertainty in Measurement: Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.

Uncertainty in Measurement: Reading Instruments

Uncertainty in Measurement: Reading Instruments

Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...

Voltammetry: Factors Affecting Measurements

Voltammetry: Factors Affecting Measurements

A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...

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Related Experiment Video

Updated: Aug 10, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Published on: January 19, 2018

Experimental Investigation on Hardware and Triggering Effect in Tip-Timing Measurement Uncertainty.

Lorenzo Capponi¹, Tommaso Tocci¹, Marco Marrazzo²

¹Department of Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy.

Sensors (Basel, Switzerland)

|February 11, 2023

Summary

This study quantifies the uncertainty in blade tip-timing measurements for gas turbines. Understanding this uncertainty is crucial for accurate structural health monitoring and dynamic behavior analysis.

Keywords:

blade vibration diagnostics tip-timing turbomachinery uncertainty

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

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Published on: May 12, 2023

Area of Science:

Mechanical Engineering
Aerospace Engineering
Non-Destructive Testing

Background:

Structural health monitoring is vital for gas turbine reliability.
Tip-timing is a key non-contact method for assessing turbine blade dynamics.
Accurate data is essential for validating predictive models.

Purpose of the Study:

To investigate the uncertainty associated with blade tip-timing measurements.
To evaluate the impact of measurement setup and data processing on uncertainty.
To provide a fundamental understanding for numerical and aeromechanical modeling validation.

Main Methods:

Experimental analysis of a commercial blade tip-timing system.
Assessment of measurement setup and data processing procedures.
Determination of uncertainty under various operating conditions.

Main Results:

Quantified the uncertainty in time-of-arrival measurements.
Identified the influence of electronic components on tip-timing uncertainty.
Determined the effect of signal processing on measurement accuracy.

Conclusions:

The study provides critical insights into the uncertainty of blade tip-timing systems.
This research supports more reliable aeromechanical modeling and condition-based maintenance.
Understanding uncertainty is fundamental for enhancing gas turbine structural health monitoring.