Abstract: There is described a sensor apparatus. It comprises an interrogator comprising a light source emitting pulses having a wavelength about an average wavelength; and a fiber Bragg grating (FBG) arrangement. The arrangement comprises a FBG sensor array comprising a plurality of FBG sensors on an optical fiber and being for reflecting the pulses, thereby producing reflected pulses at each one of the FBG sensors. FBG sensors of a given FBG sensor array have a spatial separation therebetween which is sufficient to allow, at a receiver, a temporal discrimination between the reflected pulses produced by each one of the FBG sensors. The FBG sensor array has a spectral reflection window which comprises the average wavelength.

Abstract: There is described a sensor apparatus. It comprises an interrogator comprising a light source emitting pulses having a wavelength about an average wavelength; and a fiber Bragg grating (FBG) arrangement. The arrangement comprises a FBG sensor array comprising a plurality of FBG sensors on an optical fiber and being for reflecting the pulses, thereby producing reflected pulses at each one of the FBG sensors. FBG sensors of a given FBG sensor array have a spatial separation therebetween which is sufficient to allow, at a receiver, a temporal discrimination between the reflected pulses produced by each one of the FBG sensors. The FBG sensor array has a spectral reflection window which comprises the average wavelength.

Abstract: A method for securing two frame halves of a frame assembly, including providing a pair of frame halves each having an axially extending attachment rib. The frame halves are temporarily secured for storage and transport by detachably clipping the attachment ribs together with a clip. The frame halves can be disengaged, rotated, and lockingly clipped together for final installation with the same clip.

Abstract: A frame assembly comprised of a pair of frame halves each having an axially extending attachment rib is temporarily secured for storage and transport by detachably clipping the attachment ribs together. The frame halves are disengaged, rotated, and lockingly clipped together for final installation.

Abstract: A frame assembly comprised of a pair of frame halves each having an axially extending attachment rib is temporarily secured for storage and transport by detachably clipping the attachment ribs together. The frame halves are disengaged, rotated, and lockingly clipped together for final installation.

Abstract: A frame assembly comprised of a pair of frame halves each having an axially extending attachment rib is temporarily secured for storage and transport by detachably clipping the attachment ribs together. The frame halves are disengaged, rotated, and lockingly clipped together for final installation.

Abstract: A method and apparatus is disclosed for creating a structure, such as a grating (45) in a photosensitive material (40). The method and apparatus relies upon creating at least two coherent beams of light (33, 38) and reflecting them, in a counter propagating manner, around a series of reflective elements (35, 37) along substantially equivalent paths so that the coherent beams interfere at a structure staging area (45). The structure staging area can then be utilized to create grating structures or the like having improved qualities.

Abstract: An optical device incorporating a grating structure and method of producing same. The grating structure is composed of higher and lower refractive index regions which are positioned periodically with period P, wherein at least one of an amplitude, a phase, and a spatial frequency of the grating structure varies periodically with period L, and wherein at least one of the period L and the period P is chirped continuously over substantially the full extend of the grating structure.