Photoacoustic material analysis
First Claim
1. Apparatus for determination of an interest component in a human body, comprising:
- at least one light source operative to emit a light pulse-train comprising equidistant short pulses with variable in the frequency, duration, number and power output to excite resonant acoustic oscillations in said human body;
a detector for detecting said resonant acoustic oscillations and generating an electrical signal representative of the amplitude and resonant frequency of said resonant acoustic oscillations; and
a processor for determining the concentration of said component in response to said electrical signal.
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Abstract
Disclosed is a method and apparatus for determining the concentration of an interest component in a medium by resonant photoacoustic spectroscopy (RPAS) with a light pulse-train comprising equidistant short pulses having variable duration, frequency, number, and power. The light wavelength is selected so as to be absorbed by the component of interest. Upon irradiation, acoustic oscillations are generated by the absorbed light in a relatively thin layer of the medium, characterized by a heat-diffusing length. The frequency repetition of the light short pulses in the pulse-train is chosen equal to the natural acoustic oscillation frequency of the thin layer of the medium that can be considered as a thin membrane. So, the acoustic oscillation becomes resonant. Measuring of the amplitude and the frequency of the resonant oscillations determine the concentration of interest component. The method and apparatus are suitable monitoring of blood components, especially glucose.
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Citations
23 Claims
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1. Apparatus for determination of an interest component in a human body, comprising:
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at least one light source operative to emit a light pulse-train comprising equidistant short pulses with variable in the frequency, duration, number and power output to excite resonant acoustic oscillations in said human body;
a detector for detecting said resonant acoustic oscillations and generating an electrical signal representative of the amplitude and resonant frequency of said resonant acoustic oscillations; and
a processor for determining the concentration of said component in response to said electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of determining a concentration of an interest component in a human body comprising the steps of:
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irradiating a surface of said human body having said interest component with a light pulse-train comprising equidistant short pulses having variable duration, frequency, number, and power sufficient to excite resonant acoustic oscillations in said human body;
detecting said resonant/acoustic oscillations;
generating as electrical signal representative of the amplitude and the resonant frequency said resonant acoustic oscillations; and
determining the concentration of said interest component in said human body in response to said electrical signal. - View Dependent Claims (22, 23)
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Specification