Optical Sensors
Optical Sensors - Related Videos
09:48
Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Cited by 8 •
2016
We demonstrate use of a fiber optic distributed sensor for mapping the temperature field of mixing air jets. The Rayleigh scattering-based sensor generates thousands of data points along a single fiber to provide exceptional spatial resolution that is unattainable with traditional sensors such as thermocouples.
08:32
Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Cited by 7 •
2013
A high-sensitivity photonic micro sensor was developed for electric field detection. The sensor exploits the optical modes of a dielectric sphere. Changes in the external electric field perturb the sphere morphology leading to shifts in its optical modes. The electric field strength is measured by monitoring these optical shifts.
09:39
Optical Biosensing
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2023
Optical biosensors utilize light to detect the binding of a target molecule. These sensors can utilize a label molecule, which produces a measurable signal such as fluorescence, or these sensors can be label-free and use the changes in optical properties, such as refractive index, to sense for the binding of the target molecule. This video introduces both label and label-free optical biosensors, demonstrates their use in the laboratory, and shows some applications of the technology.
09:14
Glovebox and Impurity Sensors
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University The glovebox provides a straightforward means to handle air- and moisture-sensitive solids and liquids. The glovebox is what it sounds like: a box with gloves attached to one or more sides, which allows the user to perform manipulations within the glovebox under an inert atmosphere. For manipulations under inert atmospheres, chemists can choose between Schlenk or high-vacuum techniques and a glovebox. Schlenk and...
08:31
Three-dimensional Optical-resolution Photoacoustic Microscopy
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Cited by 27 •
2011
Optical-resolution photoacoustic microscopy (OR-PAM) is an emerging technology capable of imaging optical absorption contrasts in vivo with cellular resolution and sensitivity. Here, we provide a visualized instruction on the experimental protocols of OR-PAM, including system configuration, system alignment, typical in vivo experimental procedures, and functional imaging schemes.
FAQs
The target alters one or more properties of light traveling through the sensing arrangement. An optical sensor detects that change and converts it into an electrical signal that represents the associated physical, chemical, or biological condition. Depending on the design, the measured change may appear as a variation in intensity, wavelength, phase, polarization, or light travel time.
Optical sensors can monitor intensity, wavelength, phase, polarization, and travel time. Each property provides a different way for the target to modify the detected light, allowing the system to obtain information about the condition being investigated. Selecting the relevant optical change helps engineers connect the detector output with measurements in structural, industrial, environmental, or biomedical settings.
The light source provides the optical signal, while the optical path guides that signal toward or through the region affected by the target. The photodetector receives the resulting light and converts its changed characteristics into an electrical output. Together, these components establish how the target influences the measurement and how that influence becomes usable engineering data.
Their optical measurement approach gives optical sensors immunity to electromagnetic interference, which can support reliable operation in challenging environments. This property is especially valuable when nearby electrical equipment could complicate measurement signals. The same sensing approach can also support remote operation, allowing measurements where direct placement of conventional electronic sensing hardware may be difficult.
A typical arrangement directs light from a source through an optical path toward the condition being monitored. The target changes the light in a measurable way, and a photodetector captures that change. The system then represents the detected variation as an electrical signal, providing information about the relevant physical, chemical, or biological condition.
These formats support different engineering measurement contexts. Fiber-optic sensors are relevant to remote sensing and structural health monitoring, while imaging sensors support measurements based on observed spatial information. Spectroscopic sensors are useful when wavelength-related information contributes to environmental or biomedical measurement. Together, they extend optical sensing across industrial automation, environmental monitoring, and instrumentation.
In structural health monitoring, optical sensors provide a way to observe conditions in engineered structures, including through fiber-optic arrangements suited to remote measurement. In industrial automation, they support monitoring and control tasks without requiring contact with the target. These capabilities help engineers collect information while taking advantage of noncontact operation and resistance to electromagnetic interference.
Optical sensors can obtain information from environmental and biological conditions by detecting target-induced changes in light. Their ability to operate remotely and perform noncontact measurements supports situations where direct access may be limited or undesirable. Fiber-optic, imaging, and spectroscopic approaches provide engineering systems with several ways to monitor these conditions and produce electrical measurement outputs.