IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0731941
(2010-03-25)
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등록번호 |
US-8144323
(2012-03-27)
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발명자
/ 주소 |
- Majewski, Alexander
- Noll, Robert
- Abreu, Rene
|
출원인 / 주소 |
|
대리인 / 주소 |
Smith Moore Leatherwood LLP
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인용정보 |
피인용 횟수 :
1 인용 특허 :
15 |
초록
▼
A system is provided that includes a cavity ring-down spectrometer and a processor. The spectrometer is configured to pass, through a cavity resonator, a modulated, continuous-wave electromagnetic signal at each of one or more selectable, transmission frequencies in the Terahertz region of the elect
A system is provided that includes a cavity ring-down spectrometer and a processor. The spectrometer is configured to pass, through a cavity resonator, a modulated, continuous-wave electromagnetic signal at each of one or more selectable, transmission frequencies in the Terahertz region of the electromagnetic spectrum. The spectrometer includes a transmitter that, with the cavity resonator, is configured so as to excite a single resonant mode of the cavity resonator. The processor is configured to receive a measurement of the passed portion of the modulated electromagnetic signal, and determine a phase shift of the modulated electromagnetic signal based upon the measurement. The processor is then configured to calculate a ring-down time of the cavity resonator as a function of the phase shift.
대표청구항
▼
1. A system comprising: a cavity ring-down spectrometer comprising: a transmitter configured to transmit a continuous-wave electromagnetic signal at each of one or more selectable, transmission frequencies in the Terahertz region of the electromagnetic spectrum;a modulator configured to modulate the
1. A system comprising: a cavity ring-down spectrometer comprising: a transmitter configured to transmit a continuous-wave electromagnetic signal at each of one or more selectable, transmission frequencies in the Terahertz region of the electromagnetic spectrum;a modulator configured to modulate the electromagnetic signal at a modulation frequency;a cavity resonator configured to receive the modulated electromagnetic signal and pass at least a portion of the modulated electromagnetic signal, wherein the transmitter and cavity resonator are configured so as to excite a single resonant mode of the cavity resonator; anda receiver configured to receive the portion of the modulated electromagnetic signal passing the cavity resonator; anda processor configured to receive a measurement of the portion of the modulated electromagnetic signal received by the receiver, and determine a phase shift of the modulated electromagnetic signal at the modulation frequency based upon the measurement, and wherein the processor is configured to calculate a ring-down time of the cavity resonator as a function of the phase shift. 2. The system of claim 1, wherein the processor being configured to calculate a ring-down time includes being configured to calculate an intensity ring-down time τ in accordance with the following: tan(φm′n′)=2ωmdτ wherein φm′n′ represents the phase shift at the modulation frequency for the single resonant mode m′n′, and ωmd represents the modulation frequency. 3. The system of claim 1, wherein the processor being configured to calculate a ring-down time includes being configured to calculate an amplitude ring-down time τamp in accordance with the following: tan(φm′n′)=ωmdτamp wherein φm′n′ represents the phase shift at the modulation frequency for the single resonant mode m′n′, and ωmd represents the modulation frequency. 4. The system of claim 1, wherein the cavity resonator is configured to house a sample, and wherein the processor is configured to determine an absorption signature for the sample medium as a function of the ring-down time and transmission frequency. 5. The system of claim 1, wherein the transmitter comprises a photomixer transmitter, and the receiver comprises a photomixer receiver. 6. The system of claim 1, wherein the transmitter comprises a terahertz or millimeter wave transmitter, and the receiver comprises a terahertz or millimeter wave receiver. 7. A method comprising: transmitting a continuous-wave electromagnetic signal at each of one or more selectable, transmission frequencies in the Terahertz region of the electromagnetic spectrum, the electromagnetic signal being transmitted from a transmitter in a cavity ring-down spectrometer;modulating the electromagnetic signal at a modulation frequency;passing at least a portion of the modulated electromagnetic signal through a cavity resonator, wherein the transmitter and cavity resonator are configured so as to excite a single resonant mode of the cavity resonator;receiving a measurement of the portion of the modulated electromagnetic signal passing the cavity resonator;determining a phase shift of the modulated electromagnetic signal at the modulation frequency based upon the measurement; andcalculating a ring-down time of the cavity resonator as a function of the phase shift. 8. The method of claim 7, wherein calculating a ring-down time comprises calculating an intensity ring-down time τ in accordance with the following: tan(φm′n′)=2ωmdτ wherein φm′n′ represents the phase shift at the modulation frequency for the single resonant mode m′n′, and ωmd represents the modulation frequency. 9. The method of claim 7, wherein calculating a ring-down time comprises calculating an amplitude ring-down time τamp in accordance with the following: tan(φm′n′)=ωmdτamp wherein φm′n′ represents the phase shift at the modulation frequency for the single resonant mode m′n′, and ωmd represents the modulation frequency. 10. The method of claim 7, wherein the cavity resonator houses a sample, and wherein the method further comprises determining an absorption signature for the sample medium as a function of the ring-down time and transmission frequency. 11. The method of claim 7, wherein transmitting a continuous-wave electromagnetic signal comprises transmitting a continuous-wave electromagnetic signal from a photomixer transmitter, and wherein receiving a measurement comprises receiving a measurement from a photomixer receiver. 12. The method of claim 7, wherein transmitting a continuous-wave electromagnetic signal comprises transmitting a continuous-wave electromagnetic signal from a terahertz or millimeter wave transmitter, and wherein receiving a measurement comprises receiving a measurement from a terahertz or millimeter wave receiver. 13. A non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program portions comprising: a first executable portion configured to receive a measurement, the measurement having been received from a spectrometer system configured to: transmit a continuous-wave electromagnetic signal at each of one or more selectable, transmission frequencies in the Terahertz region of the electromagnetic spectrum, the electromagnetic signal being transmitted from a transmitter in a cavity ring-down spectrometer;modulate the electromagnetic signal at a modulation frequency; andpass at least a portion of the modulated electromagnetic signal through a cavity resonator, wherein the transmitter and cavity resonator are configured so as to excite a single resonant mode of the cavity resonator, the measurement comprising a measurement of the portion of the modulated electromagnetic signal passing the cavity resonator;a second executable portion configured to determine a phase shift of the modulated electromagnetic signal at the modulation frequency based upon the measurement; anda third executable portion configured to calculate a ring-down time of the cavity resonator as a function of the phase shift. 14. The computer-readable storage medium of claim 13, wherein the third executable portion being configured to calculate a ring-down time includes being configured to calculate an intensity ring-down time τ in accordance with the following: tan(φm′n′)=2ωmdτ wherein φm′n′ represents the phase shift at the modulation frequency for the single resonant mode m′n′, and ωmd represents the modulation frequency. 15. The computer-readable storage medium of claim 13, wherein the third executable portion being configured to calculate a ring-down time includes being configured to calculate an amplitude ring-down time τamp in accordance with the following: tan(φm′n′)=2ωmdτwherein φm′n′ represents the phase shift at the modulation frequency for the single resonant mode m′n′, and ωmd represents the modulation frequency. 16. The computer-readable storage medium of claim 13, wherein the cavity resonator houses a sample, and wherein the computer-readable program portions further comprise a fourth executable portion configured to determine an absorption signature for the sample medium as a function of the ring-down time and transmission frequency. 17. The computer-readable storage medium of claim 13, wherein the spectrometer system being configured to transmit a continuous-wave electromagnetic signal includes being configured to transmit a continuous-wave electromagnetic signal from a photomixer transmitter, and wherein the spectrometer system being configured to receive a measurement includes being configured to receive a measurement from a photomixer receiver. 18. The computer-readable storage medium of claim 13, wherein the spectrometer system being configured to transmit a continuous-wave electromagnetic signal includes being configured to transmit a continuous-wave electromagnetic signal from a terahertz or millimeter wave transmitter, and wherein the spectrometer system being configured to receive a measurement includes being configured to receive a measurement from a terahertz or millimeter wave receiver.
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