AUTOMATED E-FIELD SCANNING SYSTEM FOR DOSIMETRIC ASSESSMENTS

The interest in accurate dosimetric measurements inside phantoms that simulate biological bodies has burgeoned since several regulatory comm issions began calling for or recommending the testing for compliance w ith safety standards of low power devices. This paper presents a newly developed, robot-based system that allows automated E-field scanning in tissue simulating solutions. The distinguishing characteristics of the system are its high sensitivity and its broad dynamic range (1 mu W/g to 100 mW/g) over the entire frequency range (10 MHz to over 3 GHz ) used for mobile communications. The reproducibility of the dosimetri c evaluations has been shown to be considerably better than -/+5%. Thi s has been accomplished by the use of an improved isotropic E-field pr obe connected to amplifiers with extremely low noise and drift charact eristics in conjunction with digital processing of the data. Special e mphasis has been placed on system reliability, user-friendliness and g raphic visualization of data.