Stripline Detectors Research Articles

A Microfluidic High-Resolution NMR Flow Probe

A microfluidic high-resolution NMR flow probe based on a novel stripline detector chip is demonstrated. This tool is invaluable for the in situ monitoring of reactions performed in microreactors. As an example, the acetylation of benzyl alcohol with acetyl chloride was monitored. Because of the uncompromised (sub-Hz) resolution, this probe holds great promise for metabolomics studies, as shown by an analysis of 600 nL of human cerebrospinal fluid.

Superconducting detectors for particles from atoms to proteins

Superconducting detectors are ideal for detecting low-energy particles from atoms to proteins of which kinetic energies range from less than 1 keV to ∼30 keV compatible with analytical instruments for ordinary laboratory use. The superconducting detectors have the advantages of detecting low energy quanta, because a threshold equivalent to the gap parameter (Δ) is extremely small: ∼meV that is one-thousandth of the band gap of semiconductor detectors. Any low-energy quanta including phonons created by individual particle hit-events on the detector surface can be detected through Cooper-pair breaking. Such detectors as superconducting tunnel junctions (STJs) and superconducting stripline detectors (SSLDs) are promising for developing advanced analytical instruments for nuclear physics, basic chemistry, and biology. Especially, mass spectrometry (MS) equipped with the superconducting detectors has been producing the remarkable results, which have never been obtained by conventional MS instruments.

Investigation of Etched Trenches in Technology of LEC Semi-Insulating GaAs Monolithic Linear Detector Array

The study presents the results of an experimental investigation of the role of sophisticated monolithic linear X ray strip detectors based on semi-insulating (SI) GaAs introducing etched trenches around strips into the technology. The strip line detectors are preferably determined for application in digital X-ray imaging. Investigated strip detectors were created by evaporation of Au/Zn (top) and AuGeNi (bottom) eutectic alloys, respectively onto LEG SI GaAs wafer using lift-off technique. Topology of strip line was modified by trenches using RIE etching around the detector strip. The influence of the trenches on detection properties of strip detectors are investigated in terms of charge collection efficiency, energy resolution and detection efficiency using gamma sources 241 Am and 57 Co. Obtained results show worsening of CCE in the case of trench placed on the bottom - ohmic side of detector, otherwise an improvement of energy resolution after etching treatment was observed. Current-voltage measurements show remarkable decrease of reverse current after etching the trenches.

Digital X-ray portable scanner based on monolithic semi-insulating GaAs detectors: General description and first “quantum” images

The present work describes a portable digital X-ray scanner based on bulk undoped semi-insulating (SI) GaAs monolithic strip line detectors. The scanner operates in “quantum” imaging mode (“single photon counting”), with potential improvement of the dynamic range in contrast of the observed X-ray images. The “heart” of the scanner (detection unit) is based on SI GaAs strip line detectors. The measured detection efficiency of the SI GaAs detector reached a value of over 60 % (compared to the theoretical one of ∼75 %) for the detection of 60 keV photons at a reverse bias of 200 V. The read-out electronics consists of 20 modules fabricated using a progressive SMD technology with automatic assembly of electronic devices. Signals from counters included in the digital parts of the modules are collected in a PC via a USB port and evaluated by custom developed software allowing X-ray image reconstruction. The collected data were used for the creation of the first X-ray “quantum” images of various test objects using the imaging software developed.

Microwave acoustic sensing of water in hydrocarbon/water solutions

Abstract Microwave absorption in and the consequent heating of a mixture of two fluids is used to detect the water content in liquid hydrocarbon through observing the acoustic emission amplitude induced by the thermal expansion. The applied microwave field is audio-frequency amplitude modulated. An open impedance matched 2 GHz micro stripline detector has been developed. The method is able to detect less than 3% water concentrations in ethanol in a simple laboratory set-up.