Abstract:
It is provided a capacitive type proximity sensor, comprising a sensing electrode, whereas the sensing electrode has a surface with electroconductive areas 113 and not-electroconductive areas 117, whereas the sensor is adapted for measuring an electrical field 110, 112 between the sensing electrode and an object 109, 111. Further it is described an apparatus for medical x-ray diagnosis and/or x-ray therapy and/or nuclear diagnosis/therapy, e.g. SPECT, a system for medical x-ray diagnosis and/or x- ray therapy and/or nuclear diagnosis/therapy, e.g. SPECT, a method for avoiding collision between an apparatus for medical x-ray diagnosis and/or x-ray therapy and/or nuclear diagnosis/therapy, e.g. SPECT, and an object, a programme element and a computer readable medium. It is disclosed a capacitance type proximity sensor whose sensitivity of approaching objects has an improved independence from the special geometry of the sensor itself.
Abstract:
A radio frequency identification (RFID) tag, wherein at least two resonators circuits having random resonant responses are provided and the response curves thereof measured to generate a unique identifier in respect of the tag. In one configuration, the coils of two resonator circuits are provided on opposing metal layers, and arranged such that they overlap relative to each other to the extent that the inductive coupling is substantially zero. In an alternative configuration, the tag comprises two coplanar coils, one located within the other. In a third configuration, two resonator circuits are randomly capacitively coupled.
Abstract:
The invention relates to a capacitive proximity device (30, 40, 50, 60) for sensing a presence and/or absence of an object (32) in the proximity of an electronic device (34). The capacitive proximity device (30, 40, 50, 60) comprises: an emission electrode (TA) capacitively coupled to a receiver electrode (), an oscillator (17) for generating an emission-signal (ES) being an alternating electric field () between the emission electrode (TA) and the receiving electrode (), and a sensing circuit (70, 72, 74, 76, 78) connected to the receiving electrode (). The sensing circuit receives a measured-signal (MS) from the receiver electrode (), and comprising a first synchronous detection circuit () together with a low-pass filter (14) for generating an output- signal (OS) being proportional to a distance between the object and the electronic device. The sensing circuit further comprising noise-suppression means for reducing noise from the measured-signal (MS) before entering the first synchronous detection circuit. The inventors have found that additional noise-suppression techniques are required when applying the known capacitive sensors in a electronic device.
Abstract:
A method for laser spot welding, whereby a laser beam is directed to the material to be welded, and whereby, during the welding operation, the surface temperature of said material at the spot of the weld is detected. The presence of a weld can be determined depending on the detected surface temperature after the laser beam is switched off. Furthermore, the power of the laser beam can be controlled depending on the detected surface temperature. To control the welding operation, also the reflected laser radiation from the spot of the weld can be detected.
Abstract:
The invention relates to a capacitive proximity device (30, 40, 50, 60) for sensing a presence and/or absence of an object (32) in the proximity of an electronic device (34). The capacitive proximity device (30, 40, 50, 60) comprises: an emission electrode (TA) capacitively coupled to a receiver electrode (), an oscillator (17) for generating an emission-signal (ES) being an alternating electric field () between the emission electrode (TA) and the receiving electrode (), and a sensing circuit (70, 72, 74, 76, 78) connected to the receiving electrode (). The sensing circuit receives a measured-signal (MS) from the receiver electrode (), and comprising a first synchronous detection circuit () together with a low-pass filter (14) for generating an output- signal (OS) being proportional to a distance between the object and the electronic device. The sensing circuit further comprising noise-suppression means for reducing noise from the measured-signal (MS) before entering the first synchronous detection circuit. The inventors have found that additional noise-suppression techniques are required when applying the known capacitive sensors in a electronic device.