A method of predicting the gravity-free shape of a glass sheet and a method of managing the quality of a glass sheet based on the gravity-free shape of the glass sheet. The initial shape of a glass sheet is determined. When the glass sheet is flattened, values of stress at a plurality of locations in the glass sheet are obtained. A shape that the glass sheet will have when the flattened glass sheet is deformed such that the values of stress are zero is predicted as a stress-induced shape and a gravity-free shape of the glass sheet is predicted by combining the initial shape and the stress-induced shape. Quality management is performed on glass sheets based on gravity-free shapes thereof predicted using the method of predicting the gravity-free shape of a glass sheet.

A stretchable strain sensor may exhibit wavelength selectivity according to a thickness change of a thickness of the stretchable strain sensor, in a thickness direction extending parallel to the thickness of the stretchable strain sensor, due to elongation of the stretchable strain sensor in an elongation direction extending perpendicular to the thickness direction. The stretchable strain sensor may have an emission spectrum that changes according to strain variation of a strain on the stretchable strain sensor.

A waveguide is provided. The waveguide having a first core, a second core spaced apart from and parallel with the first core, and a cladding surrounding the first core and the second core. An interstitial portion of the cladding is located between the first core and the second core. A first region of the first core adjacent to the cladding or of the cladding adjacent to the first core is color dyed.

An atmospheric suit includes a torso portion with one or more layers, and fibers of a first material arranged in each of the one or more layers. Optical fibers are interspersed with the fibers of the first material in each of the one or more layers.

A pressure transducer and a fabrication method thereof are provided. The pressure transducer includes a light-emitting element, an interference light-filtering structure and a light-sensing element stacked on top of each other. The light-emitting element is configured to emit incident light onto the interference light-filtering structure. The interference light-filtering structure is configured to change its thickness in accordance with the pressure exerted on the pressure transducer and generate emergent light corresponding to the pressure. The light-sensing element is configured to detect the emergent light and generate an electrical signal corresponding to the emergent light.

A pressure transducer and a fabrication method thereof are provided. The pressure transducer includes a light-emitting element, an interference light-filtering structure and a light-sensing element stacked on top of each other. The light-emitting element is configured to emit incident light onto the interference light-filtering structure. The interference light-filtering structure is configured to change its thickness in accordance with the pressure exerted on the pressure transducer and generate emergent light corresponding to the pressure. The light-sensing element is configured to detect the emergent light and generate an electrical signal corresponding to the emergent light.

The present disclosure provides a transparent and highly sensitive pressure sensor with improved linearity and pressure sensitivity including: a first substrate on which a micropattern having pyramidal structures is formed; a first electrode layer coated on the micropattern of the first substrate; a second substrate stacked on the first electrode layer; and a second electrode layer stacked on the second substrate, wherein the first substrate and the second substrate show a difference in light refractive index of 10% or less in the visible light region.

Embodiments relate to a torsion sensor device which measures a degree of torsion of a measurement object by using a fiber Bragg gratings (FBG) sensor, the sensor device comprising: an FBG sensor including a sensing unit formed in one section of an elongated optical fiber; and a fixing device for fixing and supporting the FBG sensor to cause displacement of the FBG sensor according to motion of the measurement object, wherein the fixing device includes a bending prevention member to enable the sensing unit to have torsion displacement without bending displacement, according to the motion of the measurement object.

Mechanoluminescent devices and articles, such as wearable articles, that include mechanoluminescent devices. The mechanoluminescent devices may have a lateral type architecture or a vertical type architecture. The mechanoluminescent devices may be sensors, including pressure sensors.

Mechanoluminescent devices and articles, such as wearable articles, that include mechanoluminescent devices. The mechanoluminescent devices may have a lateral type architecture or a vertical type architecture. The mechanoluminescent devices may be sensors, including pressure sensors.