Personal monitoring device with multi-filament tamper strap
A monitoring device includes a housing enclosing electronic circuitry including a light emitter array and first and second light receivers, a band lockably attachable to the housing, the band including a first optical filament, a second optical filament, and mounting holes between the first and second optical filaments, the mounting holes being part of a locking mechanism that locks the band to the housing. Both ends of the band are attached to the housing, the first optical filament at least partially defines a first optical path between the light emitter array and the first light receiver, and the second optical filament at least partially defines a second optical path between the light emitter array and the second light receiver. Different alert levels will issue based on whether unexpected light is received on the different optical paths.
1. A monitoring device;
a housing enclosing electronic circuitry including a light emitter array and first and second light receivers;
a band lockably attachable to the housing, the band including a first optical filament, a second optical filament, and mounting holes between the first and second optical filaments, the mounting holes being part of a locking mechanism that locks the band to the housing;
wherein when both ends of the band are attached to the housing, the first optical filament at least partially defines a first optical path between the light emitter array and the first light receiver, and the second optical filament at least partially defines a second optical path between the light emitter array and the second light receiver;
the electronic circuitry including computer hardware and software programmed cause the monitoring device to perform operations comprising:
transmit a first level alert in response to expected light being expected at both the first and second light receivers yet received by only one of the first and second light receivers; and
transmit a second level alert, higher than the first level alert, in response to expected light not being received by the first and second light receivers.
2. The monitoring device of claim 1 , wherein expected light comprises light received on a schedule.
3. The monitoring device of claim 1 , wherein expected light comprises light having predefined characteristics including light intensity, light color and/or frequency.
4. The monitoring device of claim 1 , wherein the electronic circuitry is programmed to perform the transmit the first level alert within a prescheduled reporting window, and to perform the transmit the second level alert in substantially real time regardless of timing of the prescheduled reporting window.
5. The monitoring device of claim 1 , wherein the electronic circuitry is further programmed to:
transmit a third level alert in response to unexpected light being received by only one of the first and second light receivers; and
transmit a fourth level alert, higher than the third level alert, in response to unexpected light being received by the first and second light receivers.
6. The monitoring device of claim 5 , wherein the electronic circuitry is programmed to perform the transmit the third level alert within a prescheduled reporting window, and to perform the transmit the fourth level alert in substantially real time regardless of timing of the prescheduled reporting window.
7. The monitoring device of claim 1 , wherein the electronic circuitry is further programmed to:
transmit a fifth level alert in response to unexpected light being received by the first light receiver but not the second light receiver; and
transmit a sixth level alert, higher than the fifth level, in response to unexpected light being received by the second light receiver but not the first light receiver.
8. The monitoring device of claim 1 , wherein the light emitter array includes a single individually controllable light source.
9. The monitoring device of claim 1 , wherein the light emitter array includes a plurality of individually controllable light sources.
10. The monitoring device of claim 1 , wherein the light emitter array includes first and second light emitters aligned with the band when attached to the housing.
11. The monitoring device of claim 10 , the operations further comprising:
illuminating the first light emitter and the second light emitter simultaneously.
12. The monitoring device of claim 10 , the operations further comprising:
first illuminating the first light emitter; and
second illuminating, in response to failure of the monitoring device to receive light from the first light emitter during the first illuminating, the second light emitter.
13. The monitoring device of claim 12 , the operations further comprising:
transmit the first level alert in response to expected light being expected at both the first and second light receivers yet received by only one of the first and second light receivers comprises transmit the first level alert in response to receipt of light from the second light emitter during the second illuminating in combination with failure to receive light from the first light emitter during the first illuminating; and
transmit the second level alert, higher than the first level alert, in response to expected light not being received by the first and second light receivers comprises failure to receive light from the first light emitter during the first illuminating and the second light emitter during the second illuminating.
14. The monitoring device of claim 13 , wherein the mounting holes are located away from the first and second optical filaments so as not to overlap with the first and second optical filaments.
15. The monitoring device of claim 1 , wherein the first and second optical filaments are fiber optic cables.
16. A method for detecting different types of potential compromise of integrity of a monitoring device, comprising:
providing a housing enclosing electronic circuitry including a light emitter array and first and second light receivers;
providing a band lockably attachable to both ends to the housing, the band including a first optical filament, a second optical filament, and mounting holes between the first and second optical filaments, wherein when both ends of the band are attached to the housing, the first optical filament at least partially defines a first optical path between the light emitter array and the first light receiver, and the second optical filament at least partially defines a second optical path between the light emitter array and the second light receiver;
transmitting a first level alert in response to expected light being expected at both the first and second light receivers yet received by only one of the first and second light receivers; and
transmitting a second level alert, higher than the first level alert, in response to expected light not being received by the first and second light receivers.
17. The method of claim 16 , wherein expected light comprises light received on a schedule.
18. The method of claim 16 , wherein expected light comprises light having predefined characteristics including light intensity, light color and/or frequency.
19. The method of claim 16 , wherein:
the transmitting the first level alert occurs within a prescheduled reporting window, and the transmitting the second level alert occurs in substantially real time regardless of timing of the prescheduled reporting window.
20. The method of claim 16 , further comprising:
transmitting a third level alert in response to unexpected light being received by only one of the first and second light receivers; and
transmitting a fourth level alert, higher than the third level alert, in response to unexpected light being received by the first and second light receivers.