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The measurement of soil properties on site-specific basis is desired for modern production agriculture. This paper addresses this need using an on-the-go in-situ spectrophotometer to acquire NIR reflectance spectra of soil. The spectral data is optionally augmented with electrical conductivity, temperature, and pH sensor data. Calibrations are a particular problem in that they may need to be optimized...
Measurement systems for low-frequency electromagnetic inspection of metal tubes require one or more exciter/pick-up coil pairs for measurement of inner diameter, wall thickness and electromagnetic properties (electrical conductivity and magnetic permeability) of tube material. When designing such systems, it is essential to model how the changes in coil separation and excitation waveform will affect...
Nondestructive testing techniques for diagnosis in solid materials can be carried out in three steps: defect detection, location and characterization. The actual solutions allow defect detection and location, but the defect characterization in terms of exact determination of the shape and dimension is still an open question. The present paper proposes a methodology for the reliable estimation of crack...
This paper presents an inverse method for determining the conductivity distribution of a flat, layered conductor using a multi-frequency electromagnetic sensor. Eddy current sensors are used in a wide range of non-destructive testing (NDT) applications. Single frequency sensors are very common, however, the potential of an eddy current sensor with spectroscopic techniques offer the ability to extract...
In this paper an alternative approach to analysis of NTC thermistors based on the use of commercial electromagnetic simulator tool is presented. Structure analyzed was a thick film segmented NTC thermistor. Influence of the material characteristics of thermistor paste used on the overall thermistor performance was analyzed and simulated. Obtained simulation results were compared with experimental...
This paper presents a low-cost tide measurement system based on a set of two inclinometers. The inclination sensors deliver a DC output voltage which varies linearly with the angle of its working direction. Thus, with two inclinometers assembled in orthogonal directions, it is possible to provide the tide direction and intensity. The tide measurement system was developed for a stand alone operation...
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