1,721,018 research outputs found
The autodiagnosis system of an intelligent measuring instrument
No full textThe methodological aspects and the design of the automatic self-diagnosis (auto-diagnosis) system of a high-performance measuring instrument for electrical quantities are described. The auto-diagnosis system can recognise not only severe failures which require out-of-service instrument setting, but also slight failures simply affecting accuracy or not basic features; in the latter case, the instrument is set working in degraded conditions. The auto-diagnosis process is performed making reference to the instrument architecture, based on independent and interconnected functional units, and using an analysis technique, called 'extending ring', to detect failing subsystems. The auto-diagnosis system is divided into two main parts, conceived for separate aims: one is named 'off-line full test auto-diagnosis system' and performs, at power up or on user request, a full comprehensive test; the other, named 'on-line auto-diagnosis system', continuously monitors the instrument behaviour while operating normally to reveal failures or error conditions that can derate the whole performanc
Procedure for effortless in-field calibration of three-axial rate gyro and accelerometers
No full textThe contemporaneous use of three-axis rate gyro and accelerometer is required in industrial applications such as strap-down platforms. The use of low-cost sesnors ofter requires a calibration immediately before the sensor use. This paper describes a procedure which does not require either angular velocity standards or standard accelerometers. The procedure makes use of the local gravity and of a set of rotations returning to the original position
A low-cost contactless distance meter for automotive applications
No full textThis paper describes an ultrasonic sensor that is able to measure the distance from the ground from selected points of a motor vehicle. The sensor is based on the measurement of the time of flight of an ultrasonic pulse, which is reflected by the ground. An uncertainty of 1 mm (1 σ) is obtained at rest or at low speeds; the sensor still works at speeds of up to 30 m/s although at reduced accuracy. Such a performance is obtained by employing a series of optimisation that allow the sensor to self-adapt to the different conditions to give the bests results. The sensor is composed of only low cost components, thus being apt for first car equipment in many cases
A contribution to the automatic processing of electrocardiograms using syntactic methods.
No full textLow-Cost Laser-Based Localization System for Agricultural Machines
Full text linkThis paper describes the design and test of a low-cost localization system for agricultural applications, which determines a tractor position in fields up to 0.5 km with an uncertainty of about 1 m. The proposed system employs a standard unmodified laser head, which is commonly used for field leveling, plus a reference ground-fixed laser receiver and requires neither laser modulation nor expensive time-of-flight measurements of light beam
Intelligent multi-input instrument for electrical measurements
No full textThe main characteristics of an intelligent measuring instrument for electrical quantities are outlined, putting in evidence the role of intelligence. Particular emphasis is given to the functional viewpoint, describing the most important subsystems into which the whole equipment can be divided. The main processes performed, such as autoranging, systematic errors correction, autocalibration, automatic estimation of uncertainties, autodiagnosis and instrument-to-user interfacing are also highlighted. The instrument has been completely designed and a good deal of hardware and software has been implemente
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