interferometer Articles
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Linearisation of counting interferometers with 0.1 nm precision
The paper describes a simple method for linearising interference fringes interpolation of quadru-phase detectors (QPD) used in homodyne counting laser interferometers. The linearisation of displacement measurement is obtained without any additional equipment by means of fitting ellipse to signals from QPD and removing eccentricity by calculated correction. Residual non-linearity less than 0.1 nm ...
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A Nano-Positioner Manufacturer uses Zygo Displacement Measuring Interferometer
When Physik Instrumente (PI), a premier supplier of nano-positioners, needed to characterize and quantify the performance of their PICMAWalk positioner, ZYGO's ZMI™ Displacement Measuring Interferometer was the right choice. ZMI products deliver resolutions down to 0.154 nm of real-world noise-limited performance with modular components which allow for flexible configuration and simple ...
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Inside the Gas Analyser – the Interferometer
Several of OPSIS gas analyser types utilize the DOAS technology to establish the concentration of gases. To do so, we need access to absorption spectra in different wavelength regions. A fairly straight-forward way to record spectra is to use a spectrometer. However, the spectrometer device is generally at its best in ultra-violet (UV) and visible wavelength regions. It can also be used in the ...
By OPSIS AB
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Advanced Fabrication Technology
Hyperion Optics has over a decade of experience in optical and mechanical design, manufacturing, and optical assembly. With the rapid growth in the photonics market and an increasing demand for precision and accuracy, we have heavily invested in our fabrication technology in order to better serve the optics community. Hyperon Optics has expanded its fabrication capabilities through employing ...
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Quantification of Polyurethane Polyols by NIR - Case Study
Customer: Covestro (India) Private Limted, Greater Noida, India Covestro (India) Private Limited (Formerly known as Bayer Material Science Pvt. Ltd.), part of the Bayer Group, is one of the the world’s largest producers of polymers and high-performance plastics. With its innovative strength the company is constantly coming up with new develop-ments which benefit society and the ...
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PerspectUV- an open path ambient gas monitor for industry
ABSTRACT PerspectUV is a unique instrument developed to perform ambient air monitoring in urban and industrial settings. It has been designed to be transportable with quick and simple set-up and operation that requires no specialist knowledge by the user. The instrument is fully weatherproof for operation in a wide range of environmental conditions and maintenance is minimal. This paper ...
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Portable Fourier transform infrared spectroradiometer for field measurements of radiance and emissivity
A hand-held, battery-powered Fourier transform infrared spectroradiometer weighing 12.5 kg has been developed for the field measurement of spectral radiance from the Earth’s surface and atmosphere in the 3–5-µm and 8–14-µm atmospheric windows, with a 6-cm21 spectral resolution. Other versions of this instrument measure spectral radiance between 0.4 and 20 ...
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Considerations when Purchasing a Near-Infrared Spectrometer
Understanding the Principles of NIR Spectroscopy Near-infrared (NIR) spectrometers measure the absorption or reflection of infrared light in the wavelength range 700 nm to 2500 nm (14,300 cm-1 to 4000 cm-1). For most applications, the range 1000 nm to 2500 nm (10,000 cm-1 to 4000 cm-1) is most useful; overtone and combination vibrations involving X-H bonds, (where is X is most often C, N, or O), ...
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Cerex introduces the new AirSentry FTIR Open Path Analyzer
Cerex Monitoring Solutions is pleased to announce the release of the third generation model AirSentry FTIR multi-gas open path FTIR analyzer. The decision was made to fully redesign the analyzer to take full advantage of advances in hardware and software technology. The third generation design represents a full reconfiguration of the instrument. Goals were to reduce initial and operating costs ...
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FTIR Spectroscopy
Fourier Transform Infrared (FTIR) Spectroscopy bases its functionality on the principle that almost all molecules absorb infrared light. Only the monatomic (He, Ne, Ar, etc) and homopolar diatomic (H2, N2, O2, etc) molecules do not absorb infrared light. Molecules only absorb infrared light at those frequencies where the infrared light affects the dipolar moment of the molecule. In a molecule, ...
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ATOM encoders allow rapid, high-accuracy FPD inspection and repair - Case Study
Background South Korean flat-panel display (FPD) process equipment manufacturers have held a market-leading position for some time and are the driving force behind many of the recent advances seen in the manufacture of organic light emitting diode (OLED) and active-matrix light emitting diode (AMOLED) displays. TPC Motion (TPC), a well-known Korean manufacturer of motion-control components, has ...
By Renishaw plc
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DOAS Explained
DOAS stands for Differential Optical Absorption Spectroscopy. The DOAS technique was conceived almost a century ago, and it was applied on research level to air quality monitoring already in the 1970s. In the mid-1980s, the technology was then commercialised and turned into practical and wide-spread use. The acronym DOAS itself reveals quite a lot of what it is about. ...
By OPSIS AB
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Planetary Boundary Layer: Why Is It Important?
The famous statistician George Box said “All models are wrong, but some are useful”—for calculating air quality indices and emissions estimates this is certainly true. One way to increase the utility of models is to use up-to-the-minute, local Planetary Boundary Layer (PBL) measurements as an input when generating top-down emissions estimates. Understanding the local PBL should ...
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What Is FTIR Spectroscopy?
We recently launched our newest product, the IR5 FTIR Spectrometer, but what is FTIR spectroscopy? This blog post will highlight the basics of FTIR spectroscopy, discussing how it works and what the resulting FTIR spectrum can reveal about your sample. Infrared Spectroscopy Infrared (IR) spectroscopy is one of the most used spectroscopic techniques in analytical laboratories for both qualitative ...
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How to use GT5000 Terra Gasmet FTIR Gas Analyzer
In this article we show you how to conduct measurements with our new portable GT5000 Terra FTIR gas analyzer. Watch the video below to learn how to take your gas analyses to the next level: How to use GT5000 Terra Gasmet FTIR Gas Analyzer Getting Familiar with The GT 5000 Terra Before detailing how to use the device, it is important to be aware of certain features. First, on the front side of ...
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Glossary of Fluorescence Spectroscopy Terms
Edinburgh Instruments has compiled a glossary of all the key terms related to Fluorescence Spectroscopy. Please browse the glossary bellow to find the definition for the term you are interested in.AbsorbanceMeasure of the amplitude of absorbed energy in a spectrum related to the concentration of an analyte. This term is also referred to as the negative log (base 10) of Transmittance (-log₁₀T = ...
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Inside the Gas Analyser – the Tuneable Diode Laser
OPSIS initially based all of its gas analysers on the differential optical absorption spectroscopy (DOAS) technology. It utilizes a broadband (white) light source and the spectral analysis is made over a fairly wide wavelength window, typically some tenths of nanometres. The light sources are fairly simple arc lamps while the complex technology is found in the spectrometers or interferometers ...
By OPSIS AB
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The Ultimate Guide to Optical Windows
An optical window is a flat, parallel, optically transparent component that is used to separate two specific environments from each other, while maximizing the transmission of light. Selecting optical windows for UV/VIS or IR spectroscopy can be overwhelming with all of the various options and bells and whistles. We've developed a definitive guide at Firebird Optics to help guide you through this ...
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Stand-off Raman Spectrometer for Identification of Liquids in Pressurised Gas Pipelines - Case Study
A stand-off Raman spectrometer has been developed to make observations of liquid samples within a gas pipeline. The instrument is based o a static Fourier Transform spectrometer. The high etendue offered by the instrument enabled four liquid samples to be measured from a distance of 2.4m within a gas pipeline. Liquids were identified with depths of less than 5 mm demonstrating the concept is ...
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A New Raman System For Nuclear Environments - Case Study
In partnership with Jacobs (formerly Wood Nuclear) and I3D robotics, ISI has developed a new standoff Raman system for the remote sensing of chemical agents within nuclear ...
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