In various space tasks such as space rendezvous-docking and on-orbit maintenance, the measurement of the relative posture and position of non-cooperative spacecraft is a key component. However, the commonly used global positioning ...
Optics & Photonics
Apr 2, 2024
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2
Fluidic force microscopy (FluidFM) combines the sensitivity of atomic force microscopy with microfluidics' capabilities, necessitating precise calibration of its cantilevers for reliable data. Traditional methods, however, ...
Nanomaterials
Mar 15, 2024
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1
Researchers have developed a new machine learning system to improve the accuracy and efficiency of sewer-river system models. This innovative approach, detailed in an article published in Environmental Science and Ecotechnology, ...
Environment
Mar 14, 2024
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23
A unique "passenger" is joining an upcoming mission to the moon.
Astronomy
Jan 16, 2024
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15
An optical phased array (OPA) is a nonmechanical beam-steering control device with high directivity and deflection efficiency. Due to its high resolution, fast response, and absence of inertia, the OPA is widely applied in ...
Optics & Photonics
Jul 26, 2023
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A spacecraft can estimate the attitude state by comparing external measurements from attitude sensors with reference information. CubeSats tend to use 4-quadrant analog solar sensors which have the advantages of extremely ...
Space Exploration
May 30, 2023
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9
The universe is expanding, but how fast exactly? The answer appears to depend on whether you estimate the cosmic expansion rate—referred to as the Hubble's constant, or H0—based on the echo of the Big Bang (the cosmic ...
Astronomy
Apr 4, 2023
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Seeking to expand the possibilities offered by programmable illumination, a group of researchers at the University of Connecticut developed a strategy for constructing and calibrating freeform illuminators offering greater ...
Optics & Photonics
Mar 22, 2023
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7
NPL and the University of Utrecht, Netherlands have collaborated to develop new SI-traceable gas reference materials and a fast calibration approach to improve the quantification and comparability of proton-transfer reaction ...
Analytical Chemistry
Mar 14, 2023
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2
The International Commission on Illumination (CIE) has published Technical Report CIE 251:2023 LED Reference Spectrum for Photometer Calibration, related to laboratory measurements of LED lighting.
Optics & Photonics
Feb 17, 2023
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66
Calibration is a comparison between measurements – one of known magnitude or correctness made or set with one device and another measurement made in as similar a way as possible with a second device.
The device with the known or assigned correctness is called the standard. The second device is the unit under test, test instrument, or any of several other names for the device being calibrated.
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