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Ultrasonic anemometer system based on new digital signal processing technique is described. The anemometer system consists of two pairs of ultrasonic transducers placed vertically for vector result. In one pair of transducers, short train of waves is transmitted from one transducer to another. The amplitude of the received waveform is an envelope which starts from zero reaches to a peak and then dies...
In order to solve the short distance ultrasonic distance measuring device, measurement accuracy is low, the circuit complex and technically difficult, and difficult to debug and other shortcomings. Article Atmega 16 microcontroller as the core, developed a high-precision, real-time response to, a good man-machine interface, communication ability of the ultrasonic range finder. This paper introduces...
Hardware, i.e. electronics and sensors, have to be packaged in a special way to bear the heavy mechanical loads, which are encountered in deep sea applications. Expensive materials and pressure resistant housings are often used. Another way to fulfill the requirements is to use a pressure neutral (pressure tolerant) approach by casting the components into an appropriate material. This might be a hard...
In order to increase the safety of vehicle reversing, a vehicle reversing collision avoidance device was developed based on single chip computer. The basic principle and the framework of the device were introduced. For the device hardware, the principle of ultrasonic distance measurement was given, the AT89C51 single chip computer was chosen, and the hardware circuits were designed. According to the...
The sound speed is affected by changes in the air properties, such as temperature, pressure, humidity, gas composition, and air turbulence. It has direct influence on the accuracy of distance measuring and the sound wavelength. For many indoor applications, the sound speed in air is considered as constant. For outdoor environments, a constant sound speed generates important errors of distance estimation...
In 2007, the CEA, EDF, AREVA launched a coordinated research program for the development of Generation IV sodium-cooled fast reactors (SFR). A R&D program has been defined for the development of ultrasonic (US) techniques in sodium which are required for periodic inspections and continuous monitoring. This program involves both experimentation and modeling of the associated phenomenon. Within...
The system introduces the composition of the ultrasonic distance measuring system based on S3C2410 and gives the operation principle and procedure design method. The module of temperature compensation circuit has been added to hardware circuit to improve the precision. S3C2410 drive transducer sent a 40 kHz square wave signal, opening the external interrupt and triggerring timer interrupt, The external...
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