Use Of Potentiometers Research Articles

Research publications linked with the analysis of time to exhaustion in cycling and the importance of laboratory tests

It seems sensible to establish that TTE in laboratories for each cyclist and for each specific physiologic event, involves a very high cost in human resources, time, and materials, as well as been highly demanding for cyclists from the physiological and physiological point of view. These facts preclude its widespread use for most of them. However, it is also evident that although the use of potentiometers in the field and the analysis of power profiles based on specific times represent the future, it must be recognized that, without the basic research carried out in laboratories around the world during the last three decades, this future would lack of the sufficient scientific support

Development of an automatic and mobile X-ray robot: An innovative approach to medical imaging through mechatronics

The objective of this work is the development of an automatic and mobile X-ray robot that is becoming necessary in a changing environment (aging society, growth of the developing countries, etc.). Specifically, there are three sides to such a project. First, there is the mechanical side, i.e. the design and implementation of motors on every mobile part of an X-ray unit allowing it to move around a standing patient. Then, comes the electronic side, i.e. the use of potentiometers and limit switches as feedback combined with microcontrollers. And last, the algorithm that computes three-dimensional models from two-dimensional X-rays.

Determination the accuracy of TELPOD SVP 45 resistive sensors as tools for measuring the relative displacement of points.

These devices are slide potentiometers encased in a metal package with a carbon resistive element. The manufacturer has two types of potentiometers on o er. The rst type has a linear resistance characteristics, and the second – a logarithmic one. The length of the slider path is 45 mm. The primary use of potentiometers of the SVP 45 group is their application as a regulatory element in electronic audio-visual equipment and household appliances. Other applications include various measurement systems. The main advantage of such devices is their low price – the cost of one potentiometer of the measurement devices group is an expense of circa 10 PLN. Individual sensors can be combined in the form of surveying rose es, surveying micro-lines, parallel sensor units, etc. Reference points, depending on the needs, are stabilized in the form of concrete blocks with metal rods in the ground, plugs in the walls, etc. The performance principle of a single element of the system is based on measuring changes in the distance between two points. A rod is permanently a ached to one point, and resistive sensor to the second one. The resistive sensor is connected to the second end of the metal rod with a sti leg. With the change in the distance between the test points, the rod causes a change in the slider position in the resistive sensor. The sensor is connected to the check chart with signal wires. A single check chart allows us to connect, depending on the model, from six to eight sensors. Further data transfer is carried via a USB cable to a PC. The record of changes in the section length is executed by a PC using an appropriate computer program. The data record is kept as a text le on the computer disc.

A Distributed Wireless Soil Displacement Measurement System for Active Monitoring of the Excavation Front of a Gallery

In this paper, an innovative instrument for the measurement of the soil displacement, developed at the laborato- ries of the Departments of Civil and Information Engineering of the University of Parma and currently under patenting, is presented. The instrument, which can be used in any application requiring soil movement measurements, has been origi- nally designed for the measurement of the axial terrain displacement during gallery excavation. The methods currently in use for this type of measurements, together with their advantages and disadvantages, are illustrated, motivating the rea- sons which have brought to the proposed innovative measurement system. The instrument allows to measure the soil dis- placement along an axis perpendicular to the excavation front, during a gallery excavation, through continuous measures based on the use of potentiometers. The transmission system is wireless, with multi-hop communications. This eliminates the limitations imposed by the cables which make the reading and data collection operations difficult. In particular, the wireless technology utilized during the project is based on the Z-Wave protocol, originally developed for home applica- tions. This wireless four-layer communication protocol is based on the creation of a network with a single controller and several slaves. The system has first been set and tested in the laboratories and, then, outdoor (under gravel and clay). The obtained results are very satisfactory.

Characterizing Stability and Control of Subscale Aircraft from Wind-Tunnel Dynamic Motion

This paper outlines a process of determining the stability and control characteristics of small-scale aircraft from wind-tunnel experiments which aim to emulate flight tests. Scaled aircraft models with representative control surfaces are flown in semifree flight on a test rig allowing motion in 4 degrees of freedom. The motion is measured and system identification and parameter estimation techniques are used to obtain a mathematical description of the dynamics of the model. Previous work has relied on the use of potentiometers to measure the model's attitude about its pivot point with other motion variables being generated analytically using these measurements and well-known kinematic relationships. However, it is now possible to mount sensors within the model as advances in technology have produced microelectromechanical system packages of small size, lightweight, low cost, and low power consumption. The current work is investigating the effectiveness of using microelectromechanical system inertial sensors to measure motion of the model. An example of the system identification process carried out on a one-twelfth scale BAe Hawk model is also presented. Parameter estimation is performed in the frequency domain using the equation error and output error methods.

Potentiometers

The use of potentiometers in automatic electrical computing devices has necessitated a great improvement in commercial wire wound potentiometers in order to meet exacting requirements. For example, the use of ``end resistors'' has made it necessary to hold both the over-all resistance and the resistance gradient to close tolerances. The accuracy must not only be of a high order, but it must be sustained throughout a long operating life. Methods used to improve performance, including the use of noble metal alloy contact materials, are discussed in this article.

A review of the design and use of potentiometers

This paper deals with the circuits in direct-current potentiometers and details of their construction and use. The elementary circuits are first described, followed by the more elaborate ones necessary for precision potentiometers. Thermo-electric effects and other sources of error and methods of obtaining true zero are considered. Some practical details in the accurate measurement of current and voltage are discussed, as well as the devices used for these purposes. The special form of potentiometer used as a voltage standardizer is described.

Discussion on “A review of the design and use of potentiometers” before the Meter and Instrument Section, 3rd March, 1939

Discussion on “A review of the design and use of potentiometers” before the Meter and Instrument Section, 3rd March, 1939