Abstract: A determination circuit for measuring a current is reset each time the integration value of the current exceeds a threshold until expiration of a predefined maximum integration time. This increases the accuracy of integrating a current and also increases the dynamic range of currents that can be integrated. To further increase the dynamic range of currents, the determination circuit may further include circuits having different gain factors.

Abstract: A detection module for detecting electro-magnetic radiation comprises a photosensor, a current integration circuit and an arithmetic unit fits the integration samples to a predetermined time dependency of the integrated current and computes an accumulated electrical charge accumulated over the integration time interval from the fit. Notably, the detection module is employed in an optical imaging apparatus to image e.g. a woman's breast by way of near-infrared light.

Abstract: The invention relates to a determination circuit for measuring a current. The invention also relates to a method for measuring a current using such a determination circuit and to a computer program product adapted, when being executed by a processor, to integrate a current using such a determination circuit. According to the invention an integration circuit comprising the determination circuit is reset each time the integration value of the current exceeds the threshold until expiration of a predefined maximum integration time. The invention increases the accuracy of integrating a current and also increases the dynamic range of currents that can be integrated. To further increase the dynamic range of currents as can be integrated the determination circuit may comprise circuits having different gain factors.

Abstract: In optical tomography, a wide dynamic range is necessary while measuring currents. According to an exemplary embodiment of the present invention, the currents are measured by counting the integration time and outputting a measurement result on the basis of the counted integration time, if the integrated current exceeds a threshold value before expiration of a maximum integration time.

Abstract: In optical tomography, a wide dynamic range is necessary while measuring currents. According to an exemplary embodiment of the present invention, the currents are measured by counting the integration time and outputting a measurement result on the basis of the counted integration time, if the integrated current exceeds a threshold value before expiration of a maximum integration time.

Abstract: A detection module for detecting electro-magnetic radiation comprises a photosensor, a current integration circuit and an arithmetic unit fits the integration samples to a predetermined time dependency of the integrated current and computes an accumulated electrical charge accumulated over the integration time interval from the fit. Notably, the detection module is employed in an optical imaging apparatus to image e.g. a woman's breast by way of near-infrared light.

Abstract: A motor speed control for controlling the speed of an electric induction motor by modulating the amplitude and frequency of the driving voltage. When the load increases the speed control controls the speed so as to be relatively constant with respect to the frequency of the driving voltage. Preferably, the speed control controls the amplitude of the driving voltage in proportion to the square of the frequency.

Abstract: A motor speed control for controlling the speed of an electric induction motor by modulating the amplitude and frequency of the driving voltage. When the load increases the speed control controls the speed so as to be relatively constant with respect to the frequency of the driving voltage. Preferably, the speed control controls the amplitude of the driving voltage in proportion to the square of the frequency.

Abstract: A system comprising a microprocessor and a reset and watchdog circuit. The microprocessor generates a first pulse train (P1) to indicate the correct operation of the microprocessor and the reset and watchdog circuit generates a reset signal (RST) in response to an irregularity in the occurrence of the first pulse train. The first pulse train is a substantially synchronous software copy of a second pulse train (P2) which is received by the microprocessor and which is preferably a limited a.c. supply voltage signal. This copy is generated by an appropriate programming of the microprocessor. The reset and watchdog circuit receives the first pulse train (P1) and the second pulse train (P2) and supplies the reset signal (RST) in response to a disturbed synchronism between the occurrence of the first pulse train and the second pulse train.