Microwave and millimeter wave nondestructive testing: A succinct introduction

Abstract Microwave nondestructive techniques have a long history dating from the early 1950s, with a strong flurry of activities in the 1960s and 1990s. However, these techniques still are not widely known in the nondestructive testing (NDT) community and often are referred to as “emerging techniques” or “others.” It is only during the last two or three years that some NDT conferences have allocated a whole session or two solely to the topic of microwave NDT. For those involved in the research and development of microwave and millimeter-wave NDT techniques who have long appreciated the advantages of such techniques, this increased visibility is a welcome and encouraging change.