Intrinsically safe video inspection system
View Patent ↗An intrinsically safe video inspection system intended for use in a Class I, Zone 0 area is capable of visually surveying hazardous area locations; where the potential for fire or explosion exists because of gases, dust, or easily ignitable fibers in the atmosphere. The intrinsically safe camera of the present invention has the distinct ability to be used all areas that require increased safety and works in various hazardous environments, allowing users the ability to remotely view and inspect various mines, silos, and storage tanks. The inspection system includes a low power, high 3.2 megapixel resolution camera with digital zoom capability that allows for the close inspection and examination and utilizes an LED fiber light pipe for illumination needs. The video inspection system of the present invention provides for the illumination in various cavity sizes, while reducing the risk of unintended accidents.
1. An intrinsically safe video inspection system, comprising:
a video display device;
a cable conditioning module;
a light source;
an intrinsically safe camera assembly comprising low powered components and intrinsic safety protection circuitry;
an interconnecting cable extending between said cable conditioning module and said intrinsically safe camera assembly; and
a photovoltaic power system located within the intrinsically safe camera assembly;
wherein said intrinsically safe camera assembly may be used in hazardous zones with a flammable and volatile atmosphere, and
wherein said photovoltaic power system converts light received through the interconnecting cable into electrical energy to power the intrinsically safe camera assembly such that no electrical connections through the interconnecting cable or additional power sources are required to operate the intrinsically safe camera assembly, and
wherein said intrinsic safety protection circuit further comprises redundant Zener diodes within said intrinsically safe camera assembly across signal lines to eliminate any over-voltage.
2. The intrinsically safe video inspection system of claim 1 , wherein said video display device is a host computer.
3. The intrinsically safe video inspection system of claim 2 , wherein said intrinsically safe camera assembly further comprises a low voltage regulator circuit.
4. The intrinsically safe video inspection system of claim 3 , wherein said intrinsic safety protection circuit comprises a limiting resistor in electrical connection with the interconnecting cable to eliminate any-over current conditions.
5. The intrinsically safe video inspection system of claim 2 , wherein said intrinsic safety protection circuit further comprises redundant Zener diodes across power lines within said intrinsically safe camera assembly to eliminate any over-voltage conditions.
6. The intrinsically safe video inspection system of claim 2 , further comprising said host computer in communication with a remote base computer via a communication link.
7. The intrinsically safe video inspection system of claim 6 , wherein said communication link comprises a wireless communication link.
8. The intrinsically safe video inspection system of claim 1 , wherein said interconnecting cable further comprises an electric cable of twisted shielded pairs using a communication protocol having low power.
9. The intrinsically safe video inspection system of claim 1 , wherein said cable conditioning module further comprises DC to DC converters to convert low voltage signals within said cable conditioning module to higher voltages for use in said camera assembly.
10. The intrinsically safe video inspection system of claim 1 , wherein said conditioning module further comprises a limiting resistor of a value determined by length of cable.
11. The intrinsically safe video inspection system of claim 1 , wherein said conditioning module further comprises parallel and redundant Zener diodes to avoid over-voltage conditions.
12. The intrinsically safe video inspection system of claim 1 , wherein said conditioning module further comprises a signal extender thereby allowing for longer lengths for said interconnecting cable.
13. The intrinsically safe video inspection system of claim 1 , wherein said intrinsically safe camera assembly comprises auto-cable length detection.
14. The intrinsically safe video inspection system of claim 1 , wherein said intrinsically safe camera assembly further comprises supervisory functions.
15. The intrinsically safe video inspection system of claim 1 , wherein said interconnecting cable further comprises a jacket with chemical and corrosion resistant materials.
16. The intrinsically safe video inspection system of claim 15 , wherein said jacket comprises a plastic shielding having anti-static properties.
17. The intrinsically safe video inspection system of claim 15 , wherein said jacket comprises braided and shielded cabling.
18. An intrinsically safe video inspection system, comprising:
a video display device;
a cable conditioning module;
a light source;
an intrinsically safe camera assembly comprising low powered components and intrinsic safety protection circuitry;
a fiber optic cable connecting the cable conditioning module and intrinsically safe camera assembly; and
a means for communication extending between said intrinsically safe camera assembly and said video display device,
wherein said intrinsically safe camera assembly may be used in hazardous zones with a flammable and volatile atmosphere, and
wherein light from said fiber optic cable is strategically distributed around the intrinsically safe camera assembly to provide illumination for visual inspection of interior surfaces of a space being inspected by the intrinsically safe video inspection system, and
wherein said intrinsic safety protection circuit further comprises redundant Zener diodes within said intrinsically safe camera assembly across signal lines to eliminate any over-voltage.
19. The intrinsically safe video inspection system of claim 18 , wherein said means for communication extending between said intrinsically safe camera assembly and said video display device comprises an optical communication system.
20. The intrinsically safe video inspection system of claim 18 , wherein said means for communication extending between said intrinsically safe camera assembly and said video display device comprises a wireless communication system.
21. The intrinsically safe video inspection system of claim 20 , wherein said wireless communication system consists of an antenna disposed within a housing.
22. The intrinsically safe video inspection system of claim 21 , wherein said housing is explosion proof.
23. The intrinsically safe video inspection system of claim 18 , wherein said intrinsically safe camera assembly includes a photo voltaic cell that receives light from said fiber optic cable and converts it into electrical energy to power said intrinsically safe camera assembly.
24. The intrinsically safe video inspection system of claim 18 , wherein the light source is wavelength and intensity selectable.