Scalable on-chip diffractive speckle spectrometer with high spectral
The proposed speckle spectrometer based on diffractive metasurfaces achieves a high spectral density which is promising to develop ultra-compact and high-performance spectrometers.
Long-distance Spectrometer
Long-distance spectrometers are instruments designed to perform optical or chemical analysis of samples from meters away, enabling remote, non-contact measurements in research, industrial, or hazardous environments.OverviewA long-distance spectrometer is a type of optical or chemical analyzer that allows measurements without direct contact with the sample. These instruments can operate over distances ranging from a few centimeters to tens or even hundreds of meters, depending on the technology used. They are particularly useful for analyzing large, inaccessible, or hazardous samples where traditional contact-based spectrometry is impractical .Types and Technologies1. Raman Spectrometers: Remote Raman spectrometers use laser excitation and fiber-optic probes to collect scattered light from a sample at a distance. They can provide high-quality spectra for materials such as plastics, coatings, or bulk solids, even through transparent barriers or reflective surfaces. Flexible sampling arms and transmission Raman accessories allow precise targeting and motion control for large or delicate samples . 2. Laser-Induced Breakdown Spectroscopy (LIBS): Mobile LIBS spectrometers, like the X-Trace, use a high-power pulsed laser to generate plasma on the sample surface. The emitted light is analyzed to determine elemental composition. These devices can perform remote analysis over distances exceeding 20 meters, making them suitable for fieldwork, hazardous environments, or in-situ industrial applications . 3. Chromatic Confocal Sensors: While primarily used for precise distance and surface profiling, chromatic confocal sensors can be coupled with spectrometers to measure spectral shifts over extended working distances. They exploit chromatic dispersion to determine sample displacement and surface topography with high axial and lateral resolution, typically up to several hundred millimeters .ApplicationsIndustrial Quality Control: Non-contact measurement of surface composition, coatings, or bulk materials.Environmental and Field Analysis: Remote chemical analysis of hazardous or hard-to-reach samples.Research and Conservation: Studying delicate artifacts or large samples without physical interference.Safety and Hazardous Environments: Analysis of toxic, radioactive, or explosive materials from a safe distance .Key FeaturesRemote Operation: Enables measurements from meters away, reducing risk and improving convenience.High Sensitivity: Advanced optics, filters, and detectors ensure accurate spectral data.Modularity and Portability: Many systems are designed for field use with laptop or tablet control.Versatility: Compatible with various sample types, reflective surfaces, and environmental conditions .ConclusionLong-distance spectrometers extend the capabilities of traditional spectrometry by allowing remote, non-contact analysis with high precision. Technologies such as Raman spectroscopy, LIBS, and chromatic confocal sensing provide flexible solutions for industrial, research, and field applications, enabling safe and efficient measurement of materials that are otherwise difficult to access .
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Long Distance Continuous Methane Emissions Monitoring with Dual
We measure long (> 500 m), integrated open-path concentrations of atmospheric methane using a dual frequency comb spectrometer and combine measurements with an
Southwest Spectro SuperLR Probe Long-Working-Distance Confocal
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Denoising-autoencoder-facilitated MEMS computational spectrometer
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Spectrometers, Spectrographs and Monochromators
We make instruments from short focal length, high-throughput spectrographs to long focal length, high-resolution monochromators, with a variety of choices for many different applications.
Hydrogen–Deuterium Exchange Mass Spectrometry Identifies Local and Long
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Ultra-long-working-distance spectroscopy of single
Tiny elliptical microlenses efficiently focus light onto and extract it from nano-sized light emitters, enabling an ultra-long-working-distance measurements.
Spectral Resolution in Raman Spectroscopy
Spectrometer Focal Length The distance between the focusing mirror and the detector is termed the spectrometer focal length. The longer the spectrometer focal length the better the spectral
Dual-comb photothermal spectroscopy | Nature Communications
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Long-distance remote laser-induced breakdown spectroscopy using
We demonstrate remote elemental analysis at distances up to 90 m, using a laser-induced breakdown spectroscopy scheme based on filamentation induced by the nonlinear propagation of
Design and Simulation of a Compact Remote Raman–LIBS
This study provides a theoretical foundation for achieving stable in-orbit detection in lunar material exploration and other long-distance signal detection missions.
Spectrometers
Spectrometers for Extreme Spectral Regions Traditional spectrometers work in the visible spectral range and/or with near- infrared, or possibly with near- ultraviolet
Long-term continuous monitoring of methane emissions at an oil
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Optical design of Fery imaging spectrometer with large working
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TOF mass spectrometer
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Spectrometers
Fourier-transform spectrometers can contain a Michelson interferometer, where one arm length can be mechanically scanned over a long distance (millimeters,
A long working distance optical microscope for
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Cobra-S 800 OCT Spectrometers
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Dual-comb ranging has emerged as an effective technology for long-distance metrology, providing absolute distance measurements with high speed, precision, and accuracy. Here, we
Long-Range and Dead-Zone-Free Dual-Comb Ranging for the
Here, we demonstrate a dual-comb ranging method that utilizes a free-space transceiver unit, enabling dead-zone-free measurements and simultaneous ranging with interchanged comb
Design and Series Product Development of a Space-Based Dyson
The design concept and fabrication methods, as well as the results of imaging evaluations of the proposed spectrometer, are described in detail. At present, the advanced Dyson