Localization of an object in a turbid medium using radiation of different wavelengths
First Claim
1. A system for detecting an object present in a turbid medium comprising:
- a radiation source for irradiating a turbid medium with radiation comprising radiation components of a first and a second wavelength, wherein the radiation components of the first and second wavelength are modulated with amplitude modulation at substantially equal modulation frequencies, the amplitude modulation of the radiation components of the first and second wavelength having a predetermined and fixed phase difference, anda photodetector arranged to detect an intensity signal of radiation emerging from the turbid medium.
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Abstract
A system for detecting an object (1) in a turbid medium (2) comprises a radiation source (3) for irradiating the turbid medium with radiation components of different wavelengths, preferably in the range between 600 nm and 1 μm. The radiation components are amplitude modulated, preferably in anti-phase. The radiation form the turbid medium is received by a photodetector (4) which is sensitive for the different wavelengths. Inhomogeneities in the turbid medium influence the superposition of the amplitude modulations at the photodetector, so that the photodetector outputs a signal that contains information on the presence and/or location of an object in the turbid medium.
28 Citations
21 Claims
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1. A system for detecting an object present in a turbid medium comprising:
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a radiation source for irradiating a turbid medium with radiation comprising radiation components of a first and a second wavelength, wherein the radiation components of the first and second wavelength are modulated with amplitude modulation at substantially equal modulation frequencies, the amplitude modulation of the radiation components of the first and second wavelength having a predetermined and fixed phase difference, and a photodetector arranged to detect an intensity signal of radiation emerging from the turbid medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17)
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10. A method for detecting an object in a turbid medium comprising:
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irradiating a turbid medium with radiation components having a first and a second wavelength, respectively, wherein the radiation components of the first and second wavelength are modulated with amplitude modulation at substantially equal modulation frequencies, the amplitude modulation of the radiation components of the first and second wavelength having a predetermined and fixed phase difference, and detecting an intensity signal of radiation emerging from the turbid medium, determining the presence of an object when the detected intensity signal deviates from a predetermined intensity signal. - View Dependent Claims (18, 19, 20, 21)
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Specification