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Misure e Controlli Termotecnici (A/L)
Measurement and thermotechnical controls
Enrico Primo Tomasini

Seat Ingegneria
A.A. 2015/2016
Credits 9
Hours 72
Period I
Language ENG

Prerequisites
knowledge of main measurement techniques for mechanical and thermal quantities and of static and dynamic performance of measurement instrumentation.

Learning outcomes
The course illustrates the advanced instrumentations for measuring mechanical and thermal properties, for process and quality control and product development, with particular reference to non-contact measurements, and optical and acoustic techniques. At the end of the course the student will know the working principles and will be able to use some complex measurement systems, including laser Doppler anemometry, particle image velocimetry, laser Doppler vibrometry, cameras and infrared sensors, acoustic measuring techniques (Acoustic intensimetry and beam forming)

Program
1 - Signal Analysis: time and frequency domain analysis. Spectral and cross-spectral density distributions, Signal acquisition, sampling and quantization, sampling errors (aliasing and leakage). 2 – Laser Doppler Vibrometry: Doppler effect, acusto-optic modulation, fiber optics. Michelson and Mach-Zender interferometers, optical signal processing (demodulation, tracking filter), optical access, optical surface properties. LDV: single-point, scanning, differential, in-plane, rotational, continuous scanning. Uncertainty. 3 – Vibration measurements: dB, displacement, velocity, acceleration. Vibration testing (exciters, sensors, mounting problems). Modal analysis, 1 dof, experimental modal analysis. 4 – Acoustic measurements: Sound theroy, sound field parameters, sound propagation. Sound pressure measurement: sound level meter, microphones. Acoustic intensity measurement. Microphone array techniques: Near filed acoustic holography, beamforming. 5 – Non destructive Diagnostics: Ultrasound methods, US parameters, US propagation, US beam, rilievo del difetto, US senza contatto. 6 – Flow measurement: Particle Image Velocimetry and Laser Doppler Anemometry 7 – Spectroscopy and colorimetry 8 – IR temperature measurement: IR thermal exchange, sensors and optics. Pyrometers. IR thermography: sensor, software. IR thermography calibration. 9 – Indoor comfort measurement: Subject and enviroment variables. Thermo-igrometric confort. 10 – Interferometric measurement: ESPI-Shearography.

Development of the examination
LEARNING EVALUATION METHODS
An experimental project concerning one of the course subjects has to be carried out during the course. The examination consists in an oral discussion and the presentation of the experimental project.

LEARNING EVALUATION CRITERIA
Evaluation of the understanding of topics discussed

LEARNING MEASUREMENT CRITERIA
Discussion of test cases

FINAL MARK ALLOCATION CRITERIA
Evaluation of the understanding of topics discussed

Recommended reading
Technical material provided during the course. Reference books: - E. O. Doebelin, Strumenti e Metodi di misura, Mc Graw Hill; - - Righini, Tajani, Cutolo, Introduction to optoelectronic sensors, ed. World Scientific ? Xavier P. V. Maldague, Theory and pra

Courses

• Ingegneria Meccanica (Corso di Laurea Magistrale (DM 270/04))