Study type: Medical/biological study (experimental study)

Microwave-induced thermoelastic pressure wave propagation in the cat brain med./bio.

By: Lin JC, Su JL, Wang Y
Published in: Bioelectromagnetics 1988; 9 (2): 141-147
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Aim of study (acc. to author)

To measure acoustic pressure wave propagation in brains of cats irradiated with pulsed 2.45 GHz microwaves.

Background/further details

Short rectangular microwave pulses (2 µs, 15 kW peak power) were applied singly through a direct-contact applicator located at the occipital pole of animal's head.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 2.45 GHz
Modulation type: single pulse
  • power: 15 kW peak value

Exposure 1

Main characteristics
Frequency 2.45 GHz
Type
Modulation
Modulation type single pulse
Pulse width 2 µs
Additional info

rectangular
Exposure setup
Exposure source
Chamber The animal was placed in a stereotaxic head holder.
Setup Single microwave pulses were applied to the surface of the head using a direct contact applicator 15 mm in diameter. A double stub tuner was employed to reduce the reflection coefficient.
Parameters
Measurand Value Type Method Mass Remarks
power 15 kW peak value measured - -
Measurement and calculation details

The average incident and reflected powers were measured using a bidirectional coupler and two power meters.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

The data indicate a microwave-induced pressure wave propagated in the cat brain with a speed of 1523 m/s. This speed of pressure wave propagation is close to that of conventional acoustic wave propagation. These data lend further support for the thermoelastic theory of microwave-induced auditory effects in humans and animals.

Study character:

Study funded by

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