Noncontact photo-thermal probe-beam deflection measurement of thermal diffusivity in an confined hot gas
Abstract
A pulsed carbon dioxide beam is used to produce a transient thermal refractive-index-gradient in nitrogen gas doped with trace amounts of absorbing Freon 12 at temperatures from 25 C to 425 C. The diffusion of this gradient is probed by a continuous HeNe laser beam parallel but displaced from the pulsed beam. The observed deflection signal agrees well with the theory of Jacson et al. (1981), and signal.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- October 1984
- Bibcode:
- 1984STIN...8516170L
- Keywords:
-
- Carbon Dioxide;
- High Temperature Gases;
- Laser Applications;
- Signal Measurement;
- Thermal Diffusion;
- Thermal Diffusivity;
- Deflection;
- Gradients;
- Helium-Neon Lasers;
- Nitrogen;
- Pulses;
- Refractivity;
- Lasers and Masers