# US 10,375,318 B2 · Apparatuses and methods for optical calibration > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,375,318 B2 - Document ID: US10375318B2 - Status: Granted - Kind: B2 - Application number: 15/696,791 - Filed: 2017-09-06 - Published: 2019-03-07 - Granted: 2019-08-06 - Earliest claimed: 2017-09-06 - Applicants: Xuesong Li; Siyi Dai - Inventors: Xuesong Li; Siyi Dai - Web page: https://patentgrep.com/patent/US10375318B2 ## CPC - H04N 23/90: Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums - G01N 21/278: {Constitution of standards} - G01N 21/72: using flame burners - G06F 30/20: Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) - G08B 17/125: {by using a video camera to detect fire or smoke} - G08B 29/22: Provisions facilitating manual calibration, e.g. input or output provisions for testing; Holding of intermittent values to permit measurement - H04N 23/56: provided with illuminating means - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS ## Abstract An apparatus for optical calibration includes a calibration target simulating a combustion. The calibration target further includes a first light-emitting pattern and a first light-emitting mechanism effecting the first light-emitting pattern. The apparatus includes two optical cameras aiming at the calibration target, wherein each optical camera has an observation axis and there is an angle between the two observation axes. ## Claims ### Claim 1 An apparatus for optical calibration, comprising a first calibration target simulating a combustion, the first calibration target further including a first light-emitting pattern; a first light-emitting mechanism effecting the first light-emitting pattern; and a second calibration target simulating the combustion, the second calibration target further including a second light-emitting pattern, the second light-emitting pattern being different from the first light-emitting pattern; and a second light-emitting mechanism effecting the second light-emitting pattern, wherein two optical cameras image the first calibration target at a position at a first image time, the two optical cameras image the second calibration target at the position at a second image time, each optical camera has an observation axis, there is an angle between the two observation axes, wherein the first and second calibration targets are three-dimensional physical and static objects. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the first and/or second light-emitting mechanism is fluorescence. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the first and/or second light-emitting mechanism is phosphorescence. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the first and/or second light-emitting mechanism is an electricity-driven light source disposed inside of the calibration target. ### Claim 5 (depends on 1) The apparatus according to claim 1, wherein at least one of the two optical cameras includes an optical filter. ### Claim 6 An apparatus for optical calibration, comprising a first calibration target simulating moving particles, the first calibration target further including a first plurality of light-emitting particles, wherein the first plurality of light-emitting particles have a first position at a first time (T1); and a first light-emitting mechanism effecting the first plurality of light-emitting particles; and a second calibration target simulating moving particles, the second calibration target further including a second plurality of light-emitting particles, wherein the second plurality of light-emitting particles have a second position at a second time (T2), T2 is later than T1; and a second light-emitting mechanism effecting the second plurality of light-emitting particles, wherein two optical cameras image the first calibration target at a position at a first image time, the two optical cameras image the second calibration target at the position a second image time wherein each optical camera has an observation axis, there is an angle between the two observation axes, wherein the first and second calibration targets are three-dimensional physical and static objects. ### Claim 7 (depends on 6) The apparatus according to claim 6, wherein the first and/or second light-emitting mechanism is fluorescence. ### Claim 8 (depends on 6) The apparatus according to claim 6, wherein the first and/or second light-emitting mechanism is phosphorescence. ### Claim 9 (depends on 6) The apparatus according to claim 6, wherein the first and/or second light-emitting mechanism is an electricity-driven light source disposed inside of the first calibration target. ### Claim 10 (depends on 6) The apparatus according to claim 6, wherein at least one of the two optical cameras includes an optical filter. ### Claim 11 A method for optical calibration, comprising creating a first digital model of a combustion, wherein the first digital model includes a first parameter; fabricating a calibration target of the combustion based on the first digital model, wherein the calibration target is a three-dimensional physical and static object; setting up at least two image capturing devices aiming at the calibration target; performing measurements of the calibration target using the at least two image capturing devices; and constructing a second digital model of the combustion based on the measurements using an algorithm, wherein the second digital model includes a second parameter; comparing the first parameter and the second parameter; determining whether a difference between the first parameter and the second parameter is less than a threshold; and calibrating the second parameter, if the difference between the first parameter and the second parameter is not less than the threshold. ### Claim 12 (depends on 11) The method according to claim 11, wherein the first parameter is one selected from the following: fuel injection timing, shape of fuel spraying, quantity of fuel injection, ignition location, ignition timing, flame propagation, fuel burning efficiency, energy transfer efficiency, efficiency of the mixing of fuel particles, and combustion chemistry. ### Claim 13 (depends on 11) The method according to claim 11, wherein the calibration target further includes a first light-emitting pattern; and a first light-emitting mechanism effecting the first light-emitting pattern. ### Claim 14 (depends on 13) The method according to claim 13, wherein the first light-emitting mechanism is one selected form the following: fluorescence, phosphorescence, and electricity-driven light source. ### Claim 15 (depends on 13) The method according to claim 13, wherein the calibration target further includes a second light-emitting pattern; and a second light-emitting mechanism effecting the second light-emitting pattern. ### Claim 16 (depends on 11) The method according to claim 11, wherein the image capturing devices are cameras.