Method and system to measure temperature of gases using coherent anti-stokes doppler spectroscopy
View Patent ↗A method of measuring a temperature of a noble gas in a chamber includes providing the noble gas in the chamber. The noble gas is characterized by a pressure and a temperature. The method also includes directing a first laser beam into the chamber and directing a second laser beam into the chamber. The first laser beam is characterized by a first frequency and the second laser beam is characterized by a second frequency. The method further includes converting at least a portion of the first laser beam and the second laser beam into a coherent anti-Stokes beam, measuring a Doppler broadening of the coherent anti-Stokes beam, and computing the temperature using the Doppler broadening.
1. A method of measuring a temperature of a noble gas in a chamber, the method comprising:
providing the noble gas in the chamber, wherein the noble gas is characterized by a pressure and a temperature;
directing a first laser beam into the chamber, wherein the first laser beam is characterized by a first frequency;
directing a second laser beam into the chamber, wherein the second laser beam is characterized by a second frequency;
converting at least a portion of the first laser beam and the second laser beam into a coherent anti-Stokes beam;
measuring a Doppler broadening of the coherent anti-Stokes beam; and
computing the temperature using the Doppler broadening.
2. The method of claim 1 wherein the noble gas comprises xenon.
3. The method of claim 2 wherein the noble gas comprises a mixture of xenon and krypton.
4. The method of claim 2 wherein the xenon is present in a plasma state.
5. The method of claim 1 wherein the chamber comprises a fusion reaction chamber.
6. The method of claim 1 wherein the temperature ranges from about 500 K to about 10,000 K.
7. The method of claim 6 wherein the temperature ranges from about 600 K to about 1,000 K.
8. The method of claim 1 wherein the pressure ranges from about 0.1 Ton to about 1 Ton.
9. The method of claim 1 wherein the first laser beam comprises a pulsed laser beam and the second laser beam comprises a pulsed laser beam.
10. The method of claim 1 wherein the coherent anti-Stokes beam is characterized by a frequency equal to twice the first frequency less the second frequency.