What Can Electric Noise Spectroscopy Tell Us on the Physics of Perovskites?

Electric noise spectroscopy is a non-destructive and a very sensitive method for studying the dynamic behaviors of the charge carriers and the kinetic processes in several condensed matter systems, with no limitation on operating temperatures. This technique has been extensively used to investigate several perovskite compounds, manganese oxides (La1−xSrxMnO3, La0.7Ba0.3MnO3, and Pr0.7Ca0.3MnO3), and a double perovskite (Sr2FeMoO6), whose properties have recently attracted great attention. In this work are reported the results from a detailed electrical transport and noise characterizations for each of the above cited materials, and they are interpreted in terms of specific physical models, evidencing peculiar properties, such as quantum interference effects and charge density waves.

Analysis of electric noise at vibration based diagnostics of motor-coach stock assemblies

Wide dynamic and frequency ranges, low level of noise allow using piezoelectric accelerometers as general purpose sensors for monitoring and diagnostics of vibration condition of assemblies of prospective motivecoach stock. Electric noise of a vibration parameters measuring channel depends not only on noise from the detecting element, but also on the further processing of a signal, first of all on the operation of an analog-todigital converter (ADC). The paper considers a comparative analysis of electric noise level of the vibration parameters measuring channel for piezoelectric and MEMS-accelerometers with the consideration for the influence of the ADC. As a result, the best ADCs for measuring vibration parameters are 12-digit and 16-digit ones.