Strain gauge device

Optional automated electromechanical strain gauge device, video-tracking system. 

Researchers may choose to manually record data through direct observation or automatically collect data using a strain gauge device to detect movements. 

The electronic pressure transference apparatus (Figure 1) developed at The University of Bolton was used. The apparatus consists of a wooden platform for presentation of test specimens, a strain gauge device and an electronic circuit board. A pressure pin (9mm diameter) is attached on to the load beam of the strain gauge and a corresponding hole drilled through the wooden platform. The height of the pressure pin is adjusted so that it protmdes through the hole of the platform by 1mm. 

The specimen is placed onto the wooden platform over the pressure pin and a series of known metal block weights are placed onto its surface. The strain gauge device detects the pressure transmitted through the specimen at each known pressure in increments created by the metal blocks. The amount of pressure absorbed and dissipated within the textile stmcture and the actual pressure felt immediately below the specimen ie the patient s leg is determined. The transmitted pressure throu the thickness of the specimen is the absolute pressure exerted on the patient s leg. 

Strain-Gauge Load Cells. The majority of industrial scales today use strain-gauge load cells as the weighing element. The strain-gauge load cell is a device which, when a force is appHed to it, gives an electrical output proportional to the appHed load. 

Pressure. Most pressure measurements are based on the concept of translating the process pressure into a physical movement of a diaphragm, bellows, or a Bourdon element. For electronic transmission, these basic elements are coupled with an electronic device for transforming a physical movement associated with the element into an electronic signal proportional to the process pressure, eg, a strain gauge or a linear differential variable transformer (LDVT). 

Of special interest in scale-control systems is the type in which the motion of the scale beam is sensed by a differential transformer or a group of load cells. The output of such devices is proportional to the displacement of the scale beam, which in turn is proportional to the amount of material in the weigh bucket. Many designs use loadsensing devices such as strain gauges or transducers. These eliminate the need for a scale-beam mechanism. The weigh vessel is mounted directly on the load-sensing devices. This provides many benefits in... 

A die stamping was produced in just one action. Stock (2) was fed into die (1) and the deformation to obtain a cup was performed by a stamp (3) which moved in a sleeve (4) driven by a piston of a hydraulic cylinder. The strain obtained was measured with strain gauge (5). The temperature of the deformed alloy was maintained by heating device (7) and controlled with sensor (8). After the deformation was completed shedder (9) driven by a piston (10) of hydraulic cylinder (11) ejected the cup. The whole press ram rested upon base (12). 

Electric sensing devices (strain gauges, piezoresistive transducers, and piezoelectric transducers)... 

Special strain -gauges 0-12 0.01% of span Proved standard device [551... 

Further devices use strain-gauge transducers as so-called dead-end instruments or sensors mounted on a pipe with internal flow. The principle of this arrangement is the elastic deformation of a metallic cylinder, measured with the strain gauges. Pressures up to approx. 15 kbar can be measured [11]. 

In this chapter we take a careful look at the phenomenon of electrical conductivity of materials, particularly electrolytic solutions. In the first section, the nature of electrical conductivity and its relation to the electrolyte composition and temperature is developed. The first section and the second (which deals with the direct-current contact methods for measuring conductance) introduce the basic considerations and techniques of conductance measurement. This introduction to conductance measurements is useful to the scientist, not only for electrolytic conductance, but also for understanding the applications of common resistive indicator devices such as thermistors for temperature, photoconductors for light, and strain gauges for mechanical distortion. The third section of this chapter describes the special techniques that are used to minimize the effects of electrode phenomena on the measurement of electrolytic conductance. In that section you will encounter the most recent solutions to the problems of conductometric measurements, the solutions that have sparked the resurgent interest in analytical conductometry. 

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