Temperature measurement of air convection using a Schlieren system

✍ Scribed by C. Alvarez-Herrera; D. Moreno-Hernández; B. Barrientos-García; J.A. Guerrero-Viramontes

• Book ID: 103875667
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 844 KB
• Volume: 41
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2008.07.004

✦ Synopsis

In this work, we have developed a procedure for full-field measurement of temperature of a fluid flow by using the schlieren technique. The basic idea is to relate the intensity level of each pixel in a schlieren image to the corresponding knife-edge position measured at the exit focal plane of the system. The method is applied in the measurement of temperature fields of the air convection caused by a heated rectangular metal plate (7.3 cm  12 cm). Our tests are carried out at plate temperatures of 50 1C and 80 1C. To validate the proposed method, the schlieren temperature results are compared to those obtained by a thermocouple. Thermocouple data are obtained along two mutually perpendicular directions (one direction along the optical axis, z-direction, and other direction along the x-axis, which is perpendicular to the optical axis) at points located on a 9  9 grid with a variable spacing. The thermocouple measurements were integrated along the z-axis in order to be compared with the measurements obtained by the schlieren technique. The results from the two methods show good agreement between them.