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It is well known that a voltage drop due to inrush current at an energizing transformer may at times interrupt electrical equipment. Generally, the voltage drop is calculated by using a sophisticated tool such as EMTP, so that the transformer saturation phenomenon has been properly represented. However, it is not practical for distribution system engineers to calculate the voltage drop with transformer...
Quartz sensor is promising as a gravity sensor. This paper describes an improved technique of gravity sensor, based on the VCXO and crystal properties from the principle of the quartz motion sensor. The size of prototype sensor is around 27.0×12.0×1.0 mm. The sensor is used in the experiment, which give the gravity change. The experimental results show the relationship between gravity change and load...
In this paper, progress of the domestic (Japan) round robin phase jitter measurement of quartz crystal oscillators and SAW oscillators is explained. Users apply the SONET/SDH analyzer to measure the phase jitter of quartz crystal oscillators and SAW oscillators, which is currently in demand. The SONET/SDH analyzer was chosen as the measurement device with the intention of establishing an international...
Recently, quartz crystal microbalance (QCM) techniques have found widely applications in chemical and biosensor. The quartz crystal of AT-cut used for the QCM method. This cutting mode of quartz crystal device shows good temperature-compensated behavior of the resonant frequency around room temperature, but the maximum operating temperature is limited due to the phase transition near 570 degree C...
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