A reflection optical sensor (F1-F4) for the detection of a weft thread in a weaving weft feeder (P) comprises a light emitter (1) and a light receiver (2) assembled on a relative supply printed circuit board (3) and housed in an arm (A) of the weft feeder which projects towards the front part of the weft feeder (P) and extends alongside the weft feeder drum (D) whereon the weft thread coils are wound, so as to form a path of direct light radiation, from said light emitter (1) towards a respective reflective surface (R) placed on said drum (D), and of reflected light radiation, from said reflective surface (R) to said light receiver (2), for detecting the presence/absence of a weft thread running through said path. Said light emitter (1) and light receiver (2) are assembled with mutually parallel optical axes on said supply printed circuit board (3). The optical sensor further includes a screening means (8) of the reflected radiation coming from said reflective surface (R) and directed towards said light receiver (2).

A reflection optical sensor (F1-F4) for the detection of a weft thread in a weaving weft feeder (P) comprises a light emitter (1) and a light receiver (2) assembled on a relative supply printed circuit board (3) and housed in an arm (A) of the weft feeder which projects towards the front part of the weft feeder (P) and extends alongside the weft feeder drum (D) whereon the weft thread coils are wound, so as to form a path of direct light radiation, from said light emitter (1) towards a respective reflective surface (R) placed on said drum (D), and of reflected light radiation, from said reflective surface (R) to said light receiver (2), for detecting the presence/absence of a weft thread running through said path. Said light emitter (1) and light receiver (2) are assembled with mutually parallel optical axes on said supply printed circuit board (3). The optical sensor further includes a screening means (8) of the reflected radiation coming from said reflective surface (R) and directed towards said light receiver (2).

Provided is an object detection system including: a ranging device that emits light so as to pass through a detection region and receives reflected light in which the ranging device is configured to perform a scan by changing an optical path of emitted light; and a reflection member that is provided in a scan range so as to reflect light passing through the detection region toward the ranging device.

A device (10) for determining bedbug activity comprises a housing (11) with openings (13), an insect detection zone (42) and pathways through the housing (11) that are traversing the insect detection zone (42). The device (10) has a light emitter (83) configured to direct light through the insect detection zone (42), an optical sensor (84) and a control unit. The light emitter (83) and re) the optical sensor (84) are arranged at a proximal end (43) of the insect detection zone (42) and a reflective surface is arranged at a distal end (44) of the insect detection zone (42). The optical sensor (84) is configured to receive light from the light emitter (83) via the reflective surface. The control unit controls the light emitter (83), the optical sensor (84) and the detection of bedbugs passing through the insect detection zone (42). A method for detection of bedbugs are presented.

A device (10) for determining bedbug activity comprises a housing (11) with openings (13), an insect detection zone (42) and pathways through the housing (11) that are traversing the insect detection zone (42). The device (10) has a light emitter (83) configured to direct light through the insect detection zone (42), an optical sensor (84) and a control unit. The light emitter (83) and re) the optical sensor (84) are arranged at a proximal end (43) of the insect detection zone (42) and a reflective surface is arranged at a distal end (44) of the insect detection zone (42). The optical sensor (84) is configured to receive light from the light emitter (83) via the reflective surface. The control unit controls the light emitter (83), the optical sensor (84) and the detection of bedbugs passing through the insect detection zone (42). A method for detection of bedbugs are presented.

In certain embodiments, real-time playback modification for activity event playback may be facilitated. In some embodiments, an event list portion and an event playback portion may be provided on a user interface, where the event playback portion is configured to present a playback of events on a location map in accordance with event detection times and a set of event layers for the event playback. While the event playback is occurring, a user selection of events may be obtained via the event list portion of the user interface. While the event playback is occurring, a set of layers for the event playback may be modified based on the user selection. In some embodiments, based on the modification to the set of layers, event layers may be overlaid onto the location map of the event playback portion of the user interface.

In certain embodiments, real-time playback modification for activity event playback may be facilitated. In some embodiments, an event list portion and an event playback portion may be provided on a user interface, where the event playback portion is configured to present a playback of events on a location map in accordance with event detection times and a set of event layers for the event playback. While the event playback is occurring, a user selection of events may be obtained via the event list portion of the user interface. While the event playback is occurring, a set of layers for the event playback may be modified based on the user selection. In some embodiments, based on the modification to the set of layers, event layers may be overlaid onto the location map of the event playback portion of the user interface.

A distance-measuring apparatus includes an optical window incorporating a first polarizing filter that polarizes reference light and a second polarizing filter that polarizes incident light in a direction inclined at 90 degrees relative to a polarization direction of the first polarizing filter.

A distance-measuring apparatus includes an optical window incorporating a first polarizing filter that polarizes reference light and a second polarizing filter that polarizes incident light in a direction inclined at 90 degrees relative to a polarization direction of the first polarizing filter.

An emitter and a receiver in a light barrier system are aligned by placing one or more retroreflective elements in a vicinity of the receiver such that a beam of visible light emitted by an optical alignment element impinges on a retroreflective element when the light beam emitted by the emitter impinges on the receiver. The optical alignment element is activated to emit a beam of visible light, and optical components of the system are adjusted so that the visible beam emitted by the optical alignment element impinges on, and is reflected by, the retroreflective element.