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US 12,590,893 B2Granted
Forward and back scattering smoke detector and method of use
AssigneePotter Electric Signal Company, LLC
InventorsWilson Cheung, Zhong Hua Wang, Ming Jie Chen, Fu Sheng Zhang
Life of this patent
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Abstract
Systems and methods for smoke detection which utilizes two generally identical light sources and single light detector to compare the ratio of forward and backward scattering smoke particles present in a detection area.
Claims20
A smoke detector comprising:
- a housing comprising a top, a base, and a series of co-axial disks separated by supports;
- wherein the area between the disks forms slots that allow generally unimpeded, planar flow into said housing and through a testing space;
- said housing enclosing a detector component, a circuit board, and said testing space;
- said detector component further comprising an optical support, said optical support including a generally planar optical support disk and a plurality of legs, wherein said testing space is above said optical support disk;
- said optical support disk further comprising a first light mount, a second light mount, and a sensor mount;
- said plurality of legs attached to said circuit board to form a gap between said optical support disk and said circuit board, said gap including said first light mount, said second light mount, and said sensor mount;
- the first light mount directing light from a first light source through said optical support disk at a target point in said testing space;
- the second light mount directing light from a second light source through said optical support disk at said target point in said testing space;
- and
- a sensor for detecting light scattering from particles in said testing space;
- wherein light from said first light source which scatters from said particles at an acute angle passes through said optical support disk into said sensor mount and is received at said sensor;
- wherein light from said second light source which scatters from said particles at an obtuse angle passes through said optical support disk into said sensor mount and is received at said sensor;
- and
- wherein said acute angle and said obtuse angle are in different planes.
11 more elements
A method of determining a type of smoke, the method comprising:
- providing a housing comprising a top, a base, and a series of co-axial disks separated by supports;
- wherein the area between the disks forms slots;
- providing an optical support, a circuit board, and a testing space enclosed within said housing;
- said optical support including a generally planar optical support disk and a plurality of legs, wherein said testing space is above said optical support disk;
- said optical support disk further comprising a first light mount, a a second light mount, and a sensor mount;
- said plurality of legs being attached to said circuit board and forming a gap between said optical support disk and said circuit board, said gap including said first light mount, said second light mount, and said sensor mount;
- providing particles from air, smoke, or a combination of air and smoke;
- said particles entering said housing in a generally unimpeded planar flow via said slots and flowing into said testing space;
- directing light from a first light source through said optical support disk at a target point in said testing space;
- directing light from a second light source through said optical support disk at said target point in said testing space;
- detecting light scattering from particles in said testing space through said optical support disk and into said sensor mount at a sensor within said sensor mount;
- determining a first amount of light from said first light source which scattered from said particles to said sensor at an acute angle in a first plane;
- determining a second amount of light from said second light source which scattered from said particles to said sensor at an obtuse angle in a second plane different from said first plane;
- and
- calculating a ratio of said first amount to said second amount.
12 more elements
Dependencies are inferred from the claim text.