Luminaire associate
View Patent ↗A street lighting fixture and street lamp used in street lighting containing an accelerometer that is used to detect and characterize acceleration events on a street lighting fixture. The accelerometer readings may be combined with GPS technology to determine a relocation of the street lighting fixture.
1. A luminaire associate device for use with a luminaire in a street lighting system comprising:
a luminaire associate powerline that delivers power to the luminaire associate;
an energy storage device having a recharging circuitry operatively connected to the luminaire associate powerline;
a power supply switch connected to the luminaire associate powerline and the energy storage device;
a power distribution circuit connected to the power supply switch comprising a tilt switch or level monitor switch;
a GPS receiver powered by the power supply switch;
a multiple-axis accelerometer with analog-to-digital electronic converters powered from the power supply switch; and
a computer connected to the power supply switch, the GPS receiver, and the multiple-axis accelerometer.
2. The device of claim 1 further comprising at least one item in a group comprising an electronic gyroscope, a geomagnetic sensor, and an inclinometer.
3. The device of claim 1 wherein at least two of the axes of the multiple-axis accelerometer are aligned in the luminaire associate so that the plane formed by the at least two of the axes is essentially parallel to the section of street below the luminaire associate device.
4. The device of claim 1 further comprising a wireless message transceiver.
5. The device of claim 1 further comprising a powerline communication (PLC) transmitter.
6. The device of claim 5 where the PLC transmitter is a modified geometric harmonic modulation transmitter coupled to the luminaire powerline through a transient protection device.
7. A method for determining an acceleration event of a luminaire associate mounted on a street light having a power source, a lamp pole, the street light, a GPS receiver and the luminaire associate comprising the steps of:
sensing movement of the luminaire associate through a multiple-axis accelerometer within the street light, wherein the multiple-axis accelerometer has two axes forming a plane essentially parallel to a ground plane upon which the street light sits;
recording a time and a date for sensed movement if the sensed movement exceeds a predetermined threshold;
calculating a magnitude of a horizontal acceleration from data reported by the sensing through the multiple-axis accelerometer;
determining a start of the acceleration event as the time and the date the magnitude of the horizontal acceleration if the magnitude exceeds the preset threshold;
determining an end of the acceleration event as the time and the date the magnitude of the horizontal acceleration drops below the preset threshold;
recording the horizontal acceleration data reported by each of the multiple-axis accelerometer's two axes at the time of the maximum value of the magnitude of the horizontal acceleration during the sensed movement.
8. The method of claim 7 further comprising a step estimating the direction of the sensed movement to the luminaire associate by electronically calculating the angle of the sensed movement using the horizontal acceleration data recorded by each of the multiple-axis accelerometer's two axes at the time of the maximum value of the magnitude of the horizontal acceleration during the acceleration event.
9. The method of claim 8 further comprising a step of transmitting the maximum value of the magnitude of the horizontal acceleration during the sensed movement and the direction of the sensed movement received by the luminaire associate.
10. The method of claim 7 further comprising the steps of:
fitting a template to approximate the magnitude of the horizontal acceleration during the sensed movement; and
transmitting the defining elements of the template used to approximate the magnitude of the horizontal acceleration during the sensed movement.