The Diffraction Myth - Nature Photography - diffraction in lenses

 2024-06-29 19:55:20

Instantly detect and analyse gas molecules in the near and mid-infrared range with pin-point accuracy and repeatability.

Ensure measurement accuracy and fast response time while reducing costs and operational complexity with highly selective and sensitive detection of multiple gas components simultaneously and in real-time using one instrument.

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Quantumwell

Optimize product quality control and emissions monitoring using the world's only hybrid gas analyzers that combine Quantum Cascade Laser (QCL) and Tunable Diode Laser (TDL) technologies to expand gas sensing to both the near- and mid-infrared range for faster, enhanced process insights.

Continuously monitor and detect natural gas impurities in your gas process to ensure high quality standards and compliance.

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Any pointers (especially for question 2) would be useful, as I am trying to implement one post process for this type of correction.

QCL technology is based on a principle called Tunable Diode Laser Absorption Spectroscopy (TDLAS), which measures the concentration of species in gaseous mixtures using tunable diode lasers and laser absorption spectrometry. Compared to other measurement techniques, such as Paramagnetic Detectors (PMD) and Chemiluminescence, TDLAS offers multi-element detection capabilities, high accuracy with a wide dynamic range, low maintenance requirements, and a long life cycle.

Monitor the presence of contaminants, such as acetylene, CO, CO2, and moisture, to ensure integrity of the ethylene process stream.

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QCL analyzers can be configured to have up to six high-resolution laser modules and measure up to twelve unique components simultaneously.

Emerson’s Quantum Cascade Laser technology offers fast, high resolution spectroscopy to detect and identify a range of molecules in the mid-infrared wavelength range. Coupled with Tunable Diode Laser (TDL) spectroscopy, a single instrument is now able to broaden insight and monitor both the near and mid-infrared range of spectroscopic light.

Emerson is the global technology, software and engineering powerhouse driving innovation that makes the world healthier, safer, smarter and more sustainable.

DFBlaser

I have some questions regarding barrel distortion and pincushion distortion. Since they are related I have put them in single post.

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Combining QCL and TDL techonologies into a single analyzer provides unmatched measurement performance and accuracy for process gas analysis. The narrow line width allows scanning of individual peaks of identified components with minimum interference and without filtration, reference cells, or chemometric manipulations.

1. Optical bench base plate – superior rigidity forcontinuous, high accuracy measurement that is immune to vibration and temperature changes.2. Smart laser modules – unique and sequenced laser chirp for fast, multi-component measurement.3. Optical path mirrors – direct light, rigid connection to base plate to ensure alignment.4. Flow Cell - designed to extend optical path length for greater resolution of low component (or analyte) concentrations.5. Detector - ultrafast detection of emitted light.

The use of lasers as spectroscopic light sources allows for high resolution spectroscopy (HRS), with QCLs offering access to the valuable mid-infrared (MIR) part of the electromagnetic spectrum.

Continuously monitor emissions in real-time and gain detailed insight into your gas measurement operations with Quantum Cascade Laser analyzers.

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I am aware that barrel distortion occurs more in wide-angle lenses, wherein straight lines near edges of the frame curve outwards. Is it pincushion distortion when lines curve inward, and in what conditions (what types of lenses, etc.) does pincushion distortion occur?

Science 264 553 1994

Achieve unmatched sensitivity and real-time measurement performance of your hydrogen and nitrogen impurities with Quantum Cascade Laser analyzers.

When power is applied to the analyzer, the QCL heats up and as the temperature rises, laser wavelengths begin to increase. The QCL then sweeps the wavelength frequencies to detect each component of interest before cooling the device to its original temperature. This patented laser chirp process occurs in under one microsecond, enabling thousands of spectra to be recorded each second.

Dave McMillen explains how Quantum Cascade Laser (QCL) Analyzers helps customers solve challenges like real-time gas measurement composition, accuracy, repeatability and reliability of complex analyzers installed in the field and in hazardous areas.

I am aware that some new cameras (DSLRs, DSCs, SLDs) have in-camera corrections for these distortions, and also there are some tools to correct it in post processing (e.g., PTlens) but what is the exact procedure used in the correction process? Does the correction process work in Raw Bayer domain, or after some color conversion to YCbCr?

One of QCL’s major advantages is its laser module. Rugged and compact, the packaged laser modules can be removed and easily serviced or replaced as needed. Attached securely to the analyzer’s optical bench, each module is preconfigured to detect up to two components simultaneously with no field alignment required.

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