Optical data transceiver is used to illuminate a secured space with an optical data signal which has been modulated to contain a first data sequence. One or more retroreflected optical data signals are received at the optical data transceiver from reflector elements disposed in the secured space. The retroreflected optical data signals are authenticated and a security event notification is selectively communicated to an enterprise security management controller if a variation occurs in regard to at least one retroreflected optical beam condition. The variation can involve a disruption of the optical beam and/or a displacement of the optical beam.

Systems and methods to provide a portable alarm are disclosed herein. The portable alarm may be configured to detect relative movement between a closure of an aperture and a wall forming the aperture. The portable alarm may include a detector body and a detection body. The detector body may include a detector body mount, a first sensor, a transducer, a light source, and control electronics. The detection body may include a detection body mount and a second sensor. The control electronics may be configured to control the transducer and/or the light source to generate a first feedback indicating close proximity between the first sensor and the second sensor and to control the transducer and/or the light source to generate a second feedback different from the first feedback, subsequent to provision of the first feedback, responsive to a reduction in proximity between the first sensor and the second sensor.

Systems and methods to provide a portable alarm are disclosed herein. The portable alarm may be configured to detect relative movement between a closure of an aperture and a wall forming the aperture. The portable alarm may include a detector body and a detection body. The detector body may include a detector body mount, a first sensor, a transducer, a light source, and control electronics. The detection body may include a detection body mount and a second sensor. The control electronics may be configured to control the transducer and/or the light source to generate a first feedback indicating close proximity between the first sensor and the second sensor and to control the transducer and/or the light source to generate a second feedback different from the first feedback, subsequent to provision of the first feedback, responsive to a reduction in proximity between the first sensor and the second sensor.

A beam detector apparatus (1) comprising: beam emitter apparatus (2); reflector apparatus (3), locatable across a volume to be monitored; and beam receiver apparatus (4). The beam emitter apparatus (2) is capable of creating a first linearly polarised beam of light of first linear polarisation and directing said first linearly polarised beam of light towards the reflector apparatus. The reflector apparatus (3) is capable of either: receiving the first linearly polarised beam of light and modifying such light into a beam having circular polarisation, elliptical polarisation or being unpolarised, and reflecting said circularly polarised, elliptically polarised or unpolarised beam of light towards the beam receiver apparatus; OR receiving the first linearly polarised beam of light and reflecting such light towards the beam receiver, and modifying such light into a beam having circular polarisation, elliptical polarisation or being unpolarised. The beam receiver apparatus (4) is capable of receiving said circularly polarised, elliptically polarised or unpolarised light and creating therefrom a second linearly polarised beam of light, in which the first and second linearly polarised beams of light have different polarisation.

A beam detector apparatus (1) comprising: beam emitter apparatus (2); reflector apparatus (3), locatable across a volume to be monitored; and beam receiver apparatus (4). The beam emitter apparatus (2) is capable of creating a first linearly polarised beam of light of first linear polarisation and directing said first linearly polarised beam of light towards the reflector apparatus. The reflector apparatus (3) is capable of either: receiving the first linearly polarised beam of light and modifying such light into a beam having circular polarisation, elliptical polarisation or being unpolarised, and reflecting said circularly polarised, elliptically polarised or unpolarised beam of light towards the beam receiver apparatus; OR receiving the first linearly polarised beam of light and reflecting such light towards the beam receiver, and modifying such light into a beam having circular polarisation, elliptical polarisation or being unpolarised. The beam receiver apparatus (4) is capable of receiving said circularly polarised, elliptically polarised or unpolarised light and creating therefrom a second linearly polarised beam of light, in which the first and second linearly polarised beams of light have different polarisation.

The present invention is provided with the goal of being able to scan scanning light along a plurality of planes surrounding an object of interest for crime prevention while reducing the labor of installing a sensor as well as minimizing the costs thereof. The scan sensor of the present invention includes a sensor unit that includes a light source and a scanning mechanism that scans light emitted from the light source along a predetermined plane, and an optical system that converts first scanning light that is scanned along the predetermined plane into second scanning light, which is scanned along three planes that are different from the predetermined plane and are orthogonal to each other, the optical system including reflective surfaces each of which corresponds to one of the three planes.

The present invention is provided with the goal of being able to scan scanning light along a plurality of planes surrounding an object of interest for crime prevention while reducing the labor of installing a sensor as well as minimizing the costs thereof. The scan sensor of the present invention includes a sensor unit that includes a light source and a scanning mechanism that scans light emitted from the light source along a predetermined plane, and an optical system that converts first scanning light that is scanned along the predetermined plane into second scanning light, which is scanned along three planes that are different from the predetermined plane and are orthogonal to each other, the optical system including reflective surfaces each of which corresponds to one of the three planes.

Systems and methods to provide a portable alarm are disclosed herein. The portable alarm may be configured to detect relative movement between a closure of an aperture and a wall forming the aperture. The portable alarm may include a detector body and a detection body. The detector body may include a detector body mount, a first sensor, a transducer, a light source, and control electronics. The detection body may include a detection body mount and a second sensor. The control electronics may be configured to control the transducer and/or the light source to generate a first feedback indicating close proximity between the first sensor and the second sensor and to control the transducer and/or the light source to generate a second feedback different from the first feedback, subsequent to provision of the first feedback, responsive to a reduction in proximity between the first sensor and the second sensor.

Systems and methods to provide a portable alarm are disclosed herein. The portable alarm may be configured to detect relative movement between a closure of an aperture and a wall forming the aperture. The portable alarm may include a detector body and a detection body. The detector body may include a detector body mount, a first sensor, a transducer, a light source, and control electronics. The detection body may include a detection body mount and a second sensor. The control electronics may be configured to control the transducer and/or the light source to generate a first feedback indicating close proximity between the first sensor and the second sensor and to control the transducer and/or the light source to generate a second feedback different from the first feedback, subsequent to provision of the first feedback, responsive to a reduction in proximity between the first sensor and the second sensor.