Beam phasing method and apparatus for adjusting a timing of beam projections
AssigneeFFE Limited
InventorsJacob Andelin, Marcus Perch
Life of this patent
Estimating the term…
Abstract
A method for adjusting the timing of beam projections in a beam detector. The method includes projecting a beam for the purpose of detecting obscuration of the beam and, if a level of signal of the beam detected is less than a threshold for each of a number of consecutive projections or for each consecutive projection over a pre-determined time period, initiating a warning, signalling an alarm or otherwise reacting. The method further includes adjusting the timing of projecting the beam from a nominal transmit interval ‘T’ to be within a window time-period ‘W’ extending from an amount before to an amount after the nominal transmit interval ‘T’.
Claims19
A method for adjusting a timing of beam projections in a beam detector, the method comprising:
- projecting a beam for a purpose of detecting obscuration of the beam,
- wherein, if a level of signal of the beam detected is less than a threshold for each of a number of consecutive projections or for each consecutive projection over a pre-determined time period, the method comprises the step of initiating a warning, signalling an alarm or otherwise reacting, and
- adjusting the timing of projecting the beam from a nominal transmit interval ‘T’ to be within a window time-period ‘W’ extending from an amount before to an amount after the nominal transmit interval ‘T’.
A beam detector apparatus, for adjusting a timing of beam projections in a beam detector, comprising:
- a projecting apparatus for projecting a beam for a purpose of detecting obscuration of the beam and, if a level of signal of the beam detected is less than a threshold for each of a number of consecutive projections or for each consecutive projection over a pre-determined time period, initiating a warning, signalling an alarm or otherwise reacting;
- and
- an adjusting apparatus for adjusting the timing of projecting the beam from a nominal transmit interval ‘T’ to be within a window time-period ‘W’ extending from an amount before to an amount after the nominal transmit interval ‘T’.
A beam detector system, for adjusting a timing of beam projections, the system comprising:
- a first transmitter and associated receiver constituting a first pair;
- and
- a second transmitter and associated receiver constituting a second pair, wherein the first and second transmitters are arranged in opposing configuration such that, during normal operation, an amount of light from the transmitter of one of the first pair and the second pair may be incident on the receiver of the other of the first pair and the second pair, and in which each pair of transmitter and receiver, although opposing, operate independently of the other pair by each projecting beams for the purpose of detecting obscuration of the beams such that, if a level of signal of the beams detected is less than a threshold for each of a number of consecutive projections or for each consecutive projection over a pre-determined time period, then initiating a warning, signalling an alarm or otherwise reacting;
- wherein, in order to avoid fluctuations in signal strength in use from any such incident light, at least one of the transmitters comprises adjusting apparatus for adjusting the timing of projecting the beam from a nominal transmit interval ‘T’ to be within a window time-period ‘W’ extending from an amount before to an amount after the nominal transmit interval ‘T’.
Dependencies are inferred from the claim text.