Abstract: A system for producing specific field distributions in a defined volume or region comprises: an array of electromagnetic field generating elements each with an integrated sensor for measuring the phase and amplitude of the current flowing in a metallic element or the field in a slot based element; a measurement device to enable measurement of both phase and amplitude of the electrical signals from the sensors with sufficient dynamic range for quantification of the signal; a multi channel radio frequency power source with individually controllable amplitude and phase to excite each of the electromagnetic field generating elements, and a feedback controller enabling controlled adjustment of the amplitude and phase of the radio frequency power source based on the signals from the sensors. The superposition of the fields produced by each electromagnetic field generating element produces a desired electromagnetic field distribution in the defined volume or region.

Abstract: The invention concerns a system for producing. specific field distributions in a defined volume or region. The system comprises an array of electromagnetic field generating elements each with an integrated sensor for measuring the phase and amplitude of the current flowing in a metallic element (antenna or coil) or field in a slot based element, a measurement device to enable measurement of both phase and amplitude of the electrical signals from the sensors with sufficient dynamic range for quantification of the signal, a multi channel radio frequency power source with individually controllable amplitude and phase to excite each of the electromagnetic field generating elements, and a feedback controller enabling controlled adjustment of the amplitude and phase of the radio frequency power source based on the signals from the sensors.

Abstract: A low energy emission therapy system which includes an emitter of low energy electromagnetic emissions and a probe for applying the emissions to a patient under treatment. The emitter emits a high frequency electromagnetic emission in the form of a carrier signal modulated by a plurality of modulation signals. The invention also includes an impedance transformer located intermediate the emitter and the probe in order to match the impedance of the patient with that of the output of the emitter. Particular modulation signal frequencies and application times and sequences are provided for the treatment of insomnia, and for the treatment of general anxiety disorder which may include panic attacks.

Abstract: A low energy emission therapy system is provided which includes an emitter of low energy electromagnetic emissions and a probe for applying the emissions to a patient under treatment. The emitter emits a high frequency electromagnetic emission in the form of a carrier signal modulated by a plurality of modulation signals. The invention also includes an impedance transformer located intermediate the emitter and the probe in order to match the impedance of the patient with that of the output of the emitter. Particular modulation signal frequencies and application times and sequences are provided for the treatment of insomnia, and for the treatment of general anxiety disorder which may include panic attacks.

Abstract: A low energy emission therapy system is provided which includes an emitter of low energy electromagnetic emissions and a probe for applying the emissions to a patient under treatment. The emitter emits a high frequency electromagnetic emission in the form of a carrier signal modulated by a plurality of modulation signals. The invention also includes an impedance transformer located intermediate the emitter and the probe in order to match the impedance of the patient with that of the output of the emitter. Particular modulation signal frequencies and application times and sequences are provided for the treatment of insomnia, and for the treatment of general anxiety disorder which may include panic attacks.

Abstract: The apparatus for detecting gases comprises a photoacoustic gas detector 35, in which the intensity-modulated absorbed test light beam 32' is converted into noise and detected by means of microphone 36. The photoacoustic gas detector 35 is acoustically decoupled from the gas collecting point 54 by a gas-permeable diaphragm 52 or a rigid, porous material 52'. The gas chamber 35' of photoacoustic detector 35 can be scavenged by means of supply lines 38, 38' and valves 56, 56'. It is advantageous to use a thermal source 32 intensity-modulated by phase lag. The signal is processed at microphone 36 by means of a N-path filter comprising cyclic switch 63 and R-elements 62, 65, 65'. The apparatus can be used for detecting CO.sub.2 and CO.