Review of Ultrasonic Signal Acquisition and Processing Techniques for Mechatronics and Material Engineering

2016 ◽  
Vol 251 ◽  
pp. 68-74 ◽  
Author(s):  
Linas Svilainis
Keyword(s):  
Signal Propagation ◽  
Ultrasonic Signal ◽  
Material Structure ◽  
Signal Acquisition ◽  
Profile Measurement ◽  
Structural Noise ◽  
Material Engineering ◽  
Reduction Techniques ◽  
Processing Techniques ◽  
Signal Acquisition And Processing

Review of ultrasound applications in mechanical and material engineering is presented. Application examples in material thickness, profile measurement are given. Applications for load, stress, stiffness, porosity, density, viscosity, bond strength, hardening depth evaluation are discussed. Composite or polymer curing states can be monitored. Ultrasonic signal propagation velocity, attenuation or nonlinearity can be used for aforementioned parameters extraction. Signal acquisition setup configurations along with signal processing techniques are discussed. Ultrasound can be used for structure integrity testing or monitoring. Imaging of the inner material structure or properties distribution requires special reconstruction techniques. Presence of the structural noise is masking the defects. Image reconstruction and structural noise reduction techniques are outlined.

Through-Casing Resistivity Logging Signal Acquisition and Processing Techniques

2011 ◽  
Vol 403-408 ◽  
pp. 2659-2662
Author(s):  
Zheng Guo Yan ◽  
Juan Su
Keyword(s):  
Signal Detection ◽  
Measurement Range ◽  
Low Noise ◽  
Signal Acquisition ◽  
Weak Signal ◽  
Weak Signal Detection ◽  
Detection Techniques ◽  
Resistivity Logging ◽  
Processing Techniques ◽  
Signal Acquisition And Processing

Weak signal detection is the key technique in developing through-casing resistivity logging tool. In this paper, ultra-low-noise preamplifier, oversampling method, sampling integration and sampling average method, digital phase-sensitive detection technique are applied in detecting logging signals and 30nV is achieved. The indoor calibration test and field experiment of through-casing resistivity logging model machine with those weak signal detection techniques were carried out. The result showed that the measurement range of formation resistivity is 0~200 Ω.m.

scholarly journals GPS Signal Detection under Multiplicative and Additive Noise

2012 ◽  
Vol 66 (4) ◽  
pp. 479-500 ◽  
Author(s):  
P. Huang ◽  
Y. Pi ◽  
I. Progri
Keyword(s):  
Signal Detection ◽  
Urban Areas ◽  
Multiplicative Noise ◽  
Additive Noise ◽  
Power Level ◽  
Signal Propagation ◽  
Signal Acquisition ◽  
Detection Scheme ◽  
Additive And Multiplicative Noise ◽  
Gps Signal Acquisition

In some Global Positioning System (GPS) signal propagation environments, especially in the ionosphere and urban areas with heavy multipath, GPS signal encounters not only additive noise but also multiplicative noise. In this paper we compare and contrast the conventional GPS signal acquisition method which focuses on handling GPS signal acquisition with additive noise, with the enhanced GPS signal processing under multiplicative noise by proposing an extension of the GPS detection mechanism, to include the GPS detection model that explains detection of the GPS signal under additive and multiplicative noise. For this purpose, a novel GPS signal detection scheme based on high order cyclostationarity is proposed. The principle is introduced, the GPS signal detection structure is described, the ambiguity of initial PseudoRandom Noise (PRN) code phase and Doppler shift of GPS signal is analysed. From the simulation results, the received GPS signal at low power level, which is degraded by additive and multiplicative noise, can be detected under the condition that the received block of GPS data length is at least 1·6 ms and sampling frequency is at least 5 MHz.

Sign in / Sign up

Export Citation Format

Share Document