Design and Application of Automatic Calibration Device for Multi-Channel Resistance Strain Gauge Indicator

In this paper, an automatic calibration device for multi-channel resistance strain gauge indicator is designed and its applicability and measurement accuracy are verified at laboratory. The calibration done by original resistance bridge calibrator is time-consuming for its manual operation and complex calibration process. With the intent to increase calibration efficiency, an automatic channel switch device was developed, and the resistance bridge calibrator was automated. The designed calibration device is completely computer controlled enabling a sequence of unmanned measurements. The calibration device was verified at laboratory that the maximum of error is 0.072%. It was applied to calibrate a 60-channel resistance strain gage indicator to approve its practical applicability. The result shows that the designed calibration device can realize automatic calibration and the efficiency is increased by 40%.

Effect of the Processing on the Resistance–Strain Response of Multiwalled Carbon Nanotube/Natural Rubber Composites for Use in Large Deformation Sensors

The dispersion, electrical conductivities, mechanical properties and resistance–strain response behaviors of multiwalled carbon nanotube (MWCNT)/natural rubber (NR) composites synthesized by the different processing conditions are systematically investigated at both macro- and micro-perspectives. Compared with the solution and flocculation methods, the two roll method produced the best MWCNTs distribution since the materials are mixed by strong shear stress between the two rolls. An excellent segregated conductive network is formed and that a low percolation threshold is obtained (~1 wt.%) by the two roll method. Different from the higher increases in conductivity for the composites obtained by the solution and flocculation methods when the MWCNT content is higher than 3 wt.%, the composite prepared by the two roll method displays obvious improvements in its mechanical properties. In addition, the two roll method promotes good stability, repeatability, and durability along with an ultrahigh sensitivity (GFmax = 974.2) and a large strain range (ε = 109%). The ‘shoulder peak’ phenomenon has not been observed in the composite prepared by the two roll method, confirming its potential for application as a large deformation monitoring sensor. Moreover, a mathematical model is proposed to explain the resistance–strain sensing mechanism.

Novel insights into the design of stretchable electrical systems

Soft electronics have recently gathered considerable interest because of their biomechanical compatibility. An important feature of deformable conductors is their electrical response to strain. While development of stretchable materials with high gauge factors has attracted considerable attention, there is a growing need for stretchable conductors whose response to deformation can be accurately engineered to provide arbitrary resistance-strain relationships. Rare studies addressing this issue have focused on deterministic geometries of single rigid materials, limiting the scope of these strategies. We introduce the novel concept of periodic stretchable patterns combining multiple conductive materials to produce tailored responses. Using shortest path algorithms, we establish a computationally efficient selection method to obtain the required resistance-strain relationship. Using this algorithm, we identify and experimentally demonstrate constant resistance-strain responses up to 50% elongation using a single microtextured material. Last, we demonstrate counterintuitive sinusoidal responses by integrating three materials, with interesting applications in sensing and soft robotics.

Research on Temperature Compensation of the Fiber Bragg Grating Sensor and the Resistance Strain Gauge

The fiber Bragg grating sensor is widely used in strain monitoring of large metal structure and trend to replace the resistance strain gauge due to its advantages of strong stability, high measurement accuracy, multiple points measuring, strong environmental suitability and long transmission distance. The temperature-induced strain, which can have the same order of magnitudes as the mechanically-induced strain, will cause great errors in the strain monitoring. Therefore, the temperature compensation for the sensors is essential to guarantee the measurement accuracy. The existing theoretical models and experiment platforms for analyzing the temperature compensation are established by assuming that the testing temperature is constant. However, the surrounding temperature of some large metal structure is not stable, and the effect of temperature change cannot be neglected. This paper aims to establish an analytic model and an experiment platform to compare the temperature compensation of the fiber bragg grating sensor and the resistance strain gauge. The superiority of the temperature compensation for the fiber bragg grating sensor is verified. The result provides theoretical support for choosing the fiber bragg grating sensor in the long-time strain monitoring.

Sensitive Elements of High Temperature Pressure Sensors Formed from a Doped Polycrystalline Diamond

The need to create highly accurate pressure sensors that capable operate under extreme conditions in aviation, rocket and space equipment increases and becomes more relevant. The unique properties of diamond make it a promising material for microelectronic sensors. Sensitive elements of pressure sensors were developed where a resilient element is formed from silicon but resistance strain gauges are formed from a boron-doped polycrystalline diamond film.

Textual Analysis of James Joyce’s Dubliners: A Fanonian Reading

This research paper explores Joyce’s textual resistance to the Celtic Revivalism and the Irish Catholic conservatism in Dubliners (1914). Using postcolonial theories like the one proposed by Frantz Fanon in his The Wretched of the Earth (1968), the research shows that in writing Dubliners, Joyce, unlike the Irish Revivalist authors and conservative Catholics, was more interested in showing the imperial force or power in all shades, and put the blame on the lethargy of people when it needs to be placed, whether on imperial Britain, the Revivalist authors or the Irish Catholic conservatism. The paper also makes the case that if the colonial pathology of paralysis is the central theme of Joyce’s Dubliners, nevertheless, the power to resist or the resistance strain against this pathology is another essential idea explored by Joyce in his collection of short stories.

Textual Analysis of James Joyce’s Dubliners: A Fanonian Reading

This research paper explores Joyce’s textual resistance to the Celtic Revivalism and the Irish Catholic conservatism in Dubliners (1914). Using postcolonial theories like the one proposed by Frantz Fanon in his The Wretched of the Earth (1968), the research shows that in writing Dubliners, Joyce, unlike the Irish Revivalist authors and conservative Catholics, was more interested in showing the imperial force or power in all shades, and put the blame on the lethargy of people when it needs to be placed, whether on imperial Britain, the Revivalist authors or the Irish Catholic conservatism. The paper also makes the case that if the colonial pathology of paralysis is the central theme of Joyce’s Dubliners, nevertheless, the power to resist or the resistance strain against this pathology is another essential idea explored by Joyce in his collection of short stories.