DETECTOR DEVICES

• US 20130031957A1
• Filed: 02/11/2011
• Published: 02/07/2013
• Est. Priority Date: 02/11/2010
• Status: Active Grant

• Current Assignee: Tyco Fire & Security GmbH (Johnson Controls International plc)
• Original Assignee: Thorn Security Limited (Johnson Controls International plc)
• Inventors: Shaw, John E. A., James, Timothy Andrew
• Granted Patent: US 9,286,779 B2
• Time in Patent Office: Days
• US Class Current: 73/28.01
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion
• CPC Class Codes: G08B 17/113 Constructional details
• CPC Class Codes: G08B 29/24 Self-calibration, e.g. compensating for environmental drift or ageing of components

Abstract

A detector includes a component having a surface. The surface includes, or is at least partially coated with, a contaminant-resistant or self-cleaning material. This allows the detector to remain clean without manual cleaning.

Claims

1. A detector for a fire related condition including a component having a surface;

wherein the surface includes, or is at least partially coated with a material having contaminant-resistant properties and

wherein the material comprises a low energy material having a contact angle to water of greater than about 65 degrees in air.

2. A detector according to claim 1, wherein the material has a contact angle to water of greater than about 90 degrees in air.

3. A detector according to claim 1, or wherein the material is a material selected from the following group:

hydrophobic material, super-hydrophobic material, oleophobic material, hydrocarbon group material, fluorocarbon group material, hydrocarbon polymer material, fluorocarbon polymer material, fluorocarbon copolymer material, fluorocarbon molecular attached film material, diamond surfaced material and diamond-like carbon surfaced material,

14. A detector according to claim 1, further comprising a radiation source arranged to activate a photoactivatable contaminant-resistant or self-cleaning material.

15. A detector according to claim 1, wherein the contaminant-resistant or self-cleaning material is selected such that changes to the surface on in which the material is present do not substantially alter or degrade component properties relevant to detector function.

16. A detector according to claim 1, wherein the component surface is an optical surface, wherein properties of said optical surface are selected for wavebands within one or more of the UV, visible, and infra red parts of the optical spectrum, and where a detector component is a component selected from the following group:

an optical absorber, an optical reflector, an optically transmissive structure, an optically scattering surface, a light trap, a window, a lens, a mirror, a light pipe, a light guide, a filter, a light source and an optical sensor element.

17. A detector according to claim 1, wherein the component surface is a surface where surface condition affects mass transport, or heat transport or capacity adjacent to said surface, or electrical properties of said surface including surface conductivity, capacitance, or corrosion potential, and where said detector component is a component selected from the following group:

an air passage, conduit, an ambient light screen, a mesh or insect screen, an electrically active component including an electrically conductive component, a temperature measuring device, a potential measuring device, a current measuring device, and an ionisation source.

18. A detector according to claim 1, further comprising one or more means for enhancing deposit, removal from said component surface, which means may he selected from the group:

orientation of said surface to aid deposit removal by other processes including, ambient processes including gravitation, inertial effects, vibration, wind, and rain, provision of air or other fluid flow by fan or pump, artificially inducing vibration through the component or adjacent air, and provision of heating at or adjacent to the component.

19. A detector according to claim 1, further comprising means for monitoring condition of said component surface, which means may include one or more of detector background signal level, or provision of optical systems which may include an optical source directing radiation onto said surface and an optical sensor to measure light transmitted through, or reflected or scattered from said surface.

20. A detector according to claim 1, further comprising a control system to apply one or more of means for photoactivation of a contamination-resistant or self cleaning surface and means ('"'"'or enhancing displacement of deposits from said component surface, which control means may receive input from component surface condition monitoring means and apply means for photoactivation or deposit displacement enhancement in a feedback arrangement based on a predetermined level of said input or on output of an algorithm based on said input,

21. A detector according to claim 1, wherein said contamination resistant or self cleaning material is renewed or reapplied periodically or in response to output from component surface condition monitoring means.

22. A detector according to claim 1, wherein said surface of the component comprises an external surface.

23. A detector according to claim 1, wherein the detector is a smoke, flame, gas, or temperature detector.

24. A detection system comprising a plurality of detectors, which plurality of detectors includes at least one detector being a detector according to claim 1.

4. A detector for a fire related condition including a component having a surface;

wherein the surface includes, or is at least partially coated with a material having self-cleaning properties at ambient temperatures; and

wherein the material is arranged to exhibit hydrophilic properties.

5. A detector according to claim 4, wherein the material comprises one or more metal oxide materials.

6. A detector according to claim 4, wherein the material is arranged to promote oxidative degradation of organic materials.

7. A detector according to claim 4, wherein properties of the material arc exhibited on activation by photonic radiation.

8. A detector according to claim 4, wherein the material is an oxide of a metal selected, from the following group:

manganese, manganese, copper, silver, iron, and titanium.

9. A detector according to claim 8, wherein said contaminant-resistant or self-cleaning properties of the material are promoted by exposure to radiation having a wavelength within the visible to ultraviolet range.

10. A detector according to claim 8, wherein said contaminant-resistant or self-cleaning properties of the material are promoted by exposure to radiation having a wavelength within the range 200 nm to 600 nm.

11. A detector according to claim 4, wherein the material further comprises noble or Platinum group metals.

12. A detector according to claim 4, wherein the material is rendered hydrophilic by photoactivation, and the hydrophilic material has a contact angle to water of less than about 25 degrees in air.

13. A detector according to claim 12, wherein the material has a contact angle to water of less than about 10 degrees in air.