A new type of demodulation system for low-coherence interferometric sensors based on highly birefringent fibers is presented. The optical path delay introduced by the sensor is compensated in four detection channels by quartz crystalline plates of appropriate thickness. The system can be used to decode a single-point sensor with a resolution of 2.5 x 10(-3) or two serially multiplexed sensors w...

Introduction: Quartz is one of the most common minerals in rocks on Earth and on other non-icy planetary bodies. Apart from the generation of microstructural features such as planar fractures and planar deformation features, which are associated with the high pressure and loading rates associated with shock loading [1,2], not much is known on the fracture behavior of this material during large ...

In this paper, a new friction-induced nanofabrication method is presented to fabricate protrusive nanostructures on quartz surfaces through scratching a diamond tip under given normal loads. The nanostructures, such as nanodots, nanolines, surface mesas and nanowords, can be produced on the target surface by programming the tip traces according to the demanded patterns. The height of these nano...

* 1301 Beal Ave., Ann Arbor, MI 48109, USA; Tel: (734) 763-6132, E-mail: [email protected] ABSTRACT This paper reports microdischarge-based pressure sensors which operate by measuring the change in spatial current distribution of pulsed DC microdischarges. The sensors are composed of 3D arrays of horizontal bulk metal electrodes embedded in quartz substrates. Microdischarge-based pressure sens...

Quartz solubility in H2O-CO2 fluids was measured at 800 °C and 10 kbar. Mixed fluids were generated from hydrous oxalic acid, silver oxalate, silver carbonate, and liquid H2O; solubility was determined by weight changes of the quartz crystals. Stringent blank tests and weighing procedures were used to establish the CO2 and H2O contents of experimental fluids. Using experimentally constrained mo...

We present a simple and computationally efficient classical atomistic model of silica in which the silicon and oxygen are simulated as hard spheres with four and two association sites, respectively. We have performed isobaric-isothermal Monte Carlo simulations to study the mechanical and phase behavior of this model. We have investigated solid phase structures of the model corresponding to quar...

The transformation of quartz to stishovite has been studied by X-ray and optical examination of a series of experimentally shock-loaded specimens of a quartz-copper mixture. Shock pressures of 68 to 260 kb and peak temperatures of 320 ø to 870øK wer e achieved. Stishovite was identified from quartz shock-loaded above 90 kb; the quantity increases with increasing pressure, but is not dependent o...

A low-destructive friction-induced nanofabrication method is proposed to produce three-dimensional nanostructures on a quartz surface. Without any template, nanofabrication can be achieved by low-destructive scanning on a target area and post-etching in a KOH solution. Various nanostructures, such as slopes, hierarchical stages and chessboard-like patterns, can be fabricated on the quartz surfa...