We present the procedure for designing a high speed and low power all-optical analog to digital converter (AO-ADC), by integrating InGaAsP semiconductor optical amplifier (SOA) with InP based photonic crystal (PhC) drop filters. The self-phase modulation in the SOA can shift the frequency of the Gaussian input pulse. The two output PhC based drop filters are designed to appropriately code the f...

The Simoramic analyser is a commercially available analogue Fourier transformer in which the amount of hardware is economised by an ingenious use of re-circulation. Unlike an ordinary scanning wave-analyser (for example) it is multiplex and phase-sensitive. These properties favour its use as an inverse to a multiplex interferometric Fourier spectrometer, but there are also some difficulties, an...

A basic discussion of the principles of gas chromatography and a description of a combustion gas analyzer using this chemical analysis techniqlJe are presented. During the past several years the combustion gas analyzer has been used extensively in airbreathing propulsion research projects at the APL Propulsion Research Laboratory to analyze samples from supersonic combustion and fuel-air mixing...

It is very complicated to calculate the secondorder aberrations of complex analyser systems and mistakes are liable to be made. Even if the matrix method is used the tediousness of the calculation is not altered. The usefulness of the matrix representation comes from the fact that the over-all transfer matrix of the total system is easily written as a product of the transfer matrices of various...

The range of data-gathering equipment for patient monitoring is rapidly increasing. Unfortunately there is little uniformity in the display of information. The array of monitors selected at the author's hospital includes a carbon dioxide (C02) analyser, non-invasive arterial pressure monitor and pulse oximeter. To find the five values for the end tidal CO2• systolic and diastolic blood pressure...

with carry-over or drift. Automation of these RIA assays has halved the man-hours normally required and eliminated the many errors which can occur in the manual analysis and clerical reporting of large batches of specimens. One of the drawbacks of the system is that complete shutdown occurs when there is a printer failure. This fail-safe system is not essential when the analyser is connected to...

The flicker and harmonics generated by electric arc furnaces present a problem that is well known to both the steel industry and electrical utilities. This paper presents a method to compensate for measurement errors introduced by current and voltage transformers and anti-aliasing filters in a power quality measurement system. Dynamic compensation may be performed in real time using digital fil...

The mass and effective density of black carbon (BC) particles generated from aqueous suspensions of Aquadag and fullerene soot was measured and parametrized as a function of their mobility diameter. The measurements were made by two independent research groups by operating a differential mobility analyser (DMA) in series with an aerosol particle mass analyser (APM) or a Couette centrifugal part...