We specialize in complex dielectric constant measurements, at microwave frequencies, up to a maximum temperature of 1400C. The influence of reactions or phase transitions during heating is determined.
Our services include :
- Measurement of the complex dielectric constant and tanδ of small samples, at frequencies between 50 MHz and 3000 MHz, up to high temperatures (-35°C to 1400°C), under specified industrial processing conditions (pressure, cover gas, temperature, moisture content, temperature ramp rate, density).
- After measurement of ε' and ε", calculation of values of tanδ and the Half-Power Penetration Depth and the “equivalent conductivity” using the following formulas:
- Measurement on ceramics, polymers, glasses(both solid and molten), metal oxides, ferrites, liquids, organics, foods, fabrics, earthenware, minerals, biological samples, explosives, fuels ------
- Measurement of magnetic susceptibility (ie., complex permeability) between 900 MHz and 2800 MHz, up to high temperatures (-35°C to 1000°C) with either zero magnetic bias or perpendicular DC magnetic bias (up to 3 kGauss), done under specified processing conditions (pressure, temperature, moisture content, cover gas, temperature ramp rate, density)
- Measurements of Rf and microwave attenuation coefficients, half-power depths, and reflection coefficients ( using small samples), to assist in detailed applicator design and interpretation of radar and satellite images
- Assisting with design of continuous flow and batch process applicators for industrial Rf and microwave heating
- Scoping calculations of microwave heating rates and heating distributions for process simulation, including time dependent and thermal runaway effects - used for microwave process feasibility studies
Measurements under process conditions can assist in answering the following questions:
- Will my material heat well in a microwave field?
- Will its microwave absorption characteristics change during the processing?
- How uniform will the heating of the work piece be at processing temperatures?
- Will thermal runaway be a problem in my microwave processing system?
- What is the best choice of frequency for heating/processing my material?
- Does my thermal insulation absorb/reflect microwave power at high temperatures?
- What type and geometry of applicator is best suited to processing my material?
We offer measurement services to industrial clients -----
We do collaborative measurements with university groups -----
We also do measurements just to satisfy our personal curiosity – some are posted on this website in the “on-going” experiments section
Please feel free to phone or e-mail and discuss possible measurements. We treat all communications as confidential unless advised otherwise.
Dr. Ron Hutcheon, Ph. 613 584 1029