US5096293A
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Differential fluorescence lidar and associated detection method
Assignee: Consiglio Nazionale delle Richerche
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Filing: 1990-09-17
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Granted: 1992-03-17
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Expires: 2010-09-17
Abstract
Abstract The multichannel fluorescence lidar comprises a source for the emission of a laser beam, an optical receiving system to focus the backscattered radiation, an optical channels separator and means for processing the detected signals. The device comprises means (15) for forming the ratio, two by two, of the signals originating from the optical channels separator (11), and means (17, 19) for making the comparison between the values of the ratios and a series of values stored in an archive or a data base (21).
Inventors
- 👤 Giovanna Cecchi
- 👤 Luca Pantani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:40
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6402; G01S; G01S17/00; G01S17/88; G01S7/00; G01S7/48; G01S7/4802; G01N21/17; G01N2021/1793; G01N2021/6417; G01N2021/6421
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
A multi-channel fluorescence lidar device comprising: laser beam source means for emission of a laser beam pulse; optical receiving means for focussing back scattered radiation; optical channel separator means for separating a backscattered fluorescence signal corresponding to each single laser pulse into a predetermined number of channels, to form intensity signals each of said predetermined number of channels corresponding to predetermined wavelength band values, said intensity signals being proportional to the intensity of said backscattered fluorescence signal, corresponding to each single laser pulse, in each of said predetermined wavelength band values; signal processing means for receiving said intensity signals and for forming a plurality of ratio signals, said plurality of ratio signals comprising a signal based on the ratio of each intensity signal to each other intensity signal for each single laser pulse; and comparison means for comparing the value of each ratio signal to values stored in a memory.
Claim 2
Dependent Claim
150 words
A multi-channel fluorescence lidar device comprising: laser beam source means for emission of a laser beam pulse; optical receiving means for focussing back scattered radiation; optical channel separator means for separating a backscattered fluorescence signal corresponding to each single laser pulse into a predetermined number of channels, to form intensity signals each of said predetermined number of channels corresponding to predetermined wavelength band values, said intensity signals being proportional to the intensity of said backscattered fluorescence signal, corresponding to each single laser pulse, in each of said predetermined wavelength band values; signal processing means for receiving said intensity signals and for forming a plurality of ratio signals, said plurality of ratio signals comprising a signal based on the ratio of each intensity signal to each other intensity signal for each single laser pulse; and comparison means for comparing the value of each ratio signal to values stored in a memory.
Claim 3
Dependent Claim
24 words
A device according to claim 1, wherein said signal processing means comprises an electronic processor programmed to form said ratios by means of software.
Claim 4
Dependent Claim
20 words
A device according to claim 1, wherein said signal processing means includes a hardware circuit arrangement for forming said ratio.
Claim 5
Dependent Claim
27 words
A device according to claim 1, wherein said comparison means comprises a programmed electronic processor and a multiplexer for passing data obtained from said signal processing means.
Claim 6
Dependent Claim
27 words
A device according to claim 1, wherein said optical channel separator means comprises a matrix of CCD (charged coupled device) photo detectors controlled by a central unit.
Claim 7
Independent Claim
119 words
A method of remote sensing using a multi-channel fluorescence lidar arrangement comprising the steps of: stimulating the emission of fluorescence radiation from a target located at a remote location; collecting the fluorescence radiation emitted by said target corresponding to a single stimulated emission; separating said fluorescence radiation into a plurality of channels, to form a plurality of intensity signals each channel corresponding to a predetermined emission wavelength band; processing each of said intensity signals obtained to form a ration of each intensity signal to each other intensity signal to form a plurality of ratio signals for each single stimulated emission; and comparing each of said ratio signals to predetermined stored signals corresponding to defined targets or categories of targets.
Claim 8
Independent Claim
119 words
A method of remote sensing using a multi-channel fluorescence lidar arrangement comprising the steps of: stimulating the emission of fluorescence radiation from a target located at a remote location; collecting the fluorescence radiation emitted by said target corresponding to a single stimulated emission; separating said fluorescence radiation into a plurality of channels, to form a plurality of intensity signals each channel corresponding to a predetermined emission wavelength band; processing each of said intensity signals obtained to form a ration of each intensity signal to each other intensity signal to form a plurality of ratio signals for each single stimulated emission; and comparing each of said ratio signals to predetermined stored signals corresponding to defined targets or categories of targets.
Claim 9
Dependent Claim
28 words
A method according to claim 6 wherein said comparison between values of said ratios obtained from the detected signals and said stored signals is made in real time.
Claim 10
Dependent Claim
157 words
A multi-channel fluorescence lidar device comprising: laser beam source means for emission of a laser beam pulse directed at a remote object; optical receiving means for focussing backscattered radiation from said remote object; optical channel separator for separating backscattered fluorescence radiation corresponding to each signal laser pulse into a predetermined number of channels to form a plurality of intensity signal, each of said predetermined number of channels corresponding to predetermined wavelength values, said intensity signals being proportional to the intensity of said backscattered fluorescence signal in each of said predetermined specific wavelength bands for each signal laser pulse; signal processing means for receiving said intensity signals and for forming a plurality of ratio signals, said plurality of ratio signals comprising a signal based on the ratio of each intensity signal to each other intensity signal for each single laser pulse; and comparison means for comparing the value of each ratio signal to values stored in a memory.
Claim 11
Dependent Claim
157 words
A multi-channel fluorescence lidar device comprising: laser beam source means for emission of a laser beam pulse directed at a remote object; optical receiving means for focussing backscattered radiation from said remote object; optical channel separator for separating backscattered fluorescence radiation corresponding to each signal laser pulse into a predetermined number of channels to form a plurality of intensity signal, each of said predetermined number of channels corresponding to predetermined wavelength values, said intensity signals being proportional to the intensity of said backscattered fluorescence signal in each of said predetermined specific wavelength bands for each signal laser pulse; signal processing means for receiving said intensity signals and for forming a plurality of ratio signals, said plurality of ratio signals comprising a signal based on the ratio of each intensity signal to each other intensity signal for each single laser pulse; and comparison means for comparing the value of each ratio signal to values stored in a memory.
References Cited (Backward Citations)
US4959549A
Cited
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