Abstract: A process for geotechnic exploration comprising the steps of:(a) Emitting one or more brief electromagnetic pulses or waves from an airborne platform at regular intervals based on the airspeed of the platform and the area being surveyed;(b) The wavelengths, frequencies and cyclicity of the waves being selected to provide, upon reflection, satisfactory indicia of the physical characteristics of the area being measured;(c) Receiving the reflections of said waves at said platform;(d) Amplifying said reflected waves to a readily processable level;(e) Processing said waves to enhance the spatial resolution of images produced therefrom;(f) Further processing said waves by selecting those variables represented by the waves that are deemed relevant;(g) Displaying said waves in visual form representing a cross-section of an area;(h) If desired, storing in recoverable form the signals representing said variables; and(i) Repeating said process as often as desired.

Abstract: The nature of cells such as human or animal cells is identified by means of microwaves. The cells to be identified, as well as normal cells, are interposed respectively into one of two microwave beams thereby to obtain microwave absorption spectra. The two spectra are subtracted from each other preferably by shifting the phase of one beam by 180.degree. so that the two microwave spectra normally cancel each other. The resultant spectrum is detected and may be recorded, or otherwise exhibited by an oscilloscope. Instead of using cells, it is possible to use tissues or slices. It has been found that the thus obtained microwave spectra are characteristic of malignant cells and permit to distinguish, for example, between carcinomas, sarcomas and melanomas. The microwave range may be between 5 and 150 GHz (gigahertz) and preferably the range is between 76 to 86 GHz.