Date of Award

Spring 1994

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical & Computer Engineering

Program/Concentration

Electrical Engineering

Committee Director

Sacharia Albin

Committee Member

Vishnu K. Lakdawala

Committee Member

Linda L. Vahala

Call Number for Print

Special Collections LD4331.E55B85

Abstract

Conventional metal film sensors can measure flow instabilities of the order of 60 kHz. The turbulence fluctuations in the hypersonic regime are of the order of 200- 400 kHz. To measure these fluctuations, sensors with an enhanced frequency response are required. Therefore, it is required to identify the parameters to enhance the frequency response. These include parameters such as the temperature sensitivity, the resistivity, the thermal conductivity, the diffusivity, specific heat capacity and the geometric size and shape of the film and the substrate. A selection of materials was then carried out to maximize the frequency response. Diamond was identified as a promising candidate along with a few other materials. Four different film and substrate material combinations were considered: diamond-on-quartz, diamond-on-diamond, nickel-on-diamond and nickel-on-quartz. Simulations carried out on these four material combinations show that diamond-on quartz sensor has the best frequency response among the materials considered. The 3 dB response of the diamond film sensors is of the order of 500 kHz. These diamond film sensors are suitable for hypersonic flow studies.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

DOI

10.25777/645y-3g83

Download

Share

COinS