Abstract: An inspection system capable of identifying particles within a liquid container such as a vial or syringe. The inspection system captures images of a container after it has stopped spinning while it is moving in a linear path through the field of view of an imager. A plurality of images are captured of the container at different positions within the field of view. The images are registered to each other and combined in order to identify particles that have moved between images, which are considered particles.

Abstract: This invention relates to a method of operating a bridge circuit comprising an input that receives a DC signal of voltage +VS, an output having an electromagnet connected thereacross, first and second arms having first and second switches respectively and being connected to opposed ends of the electromagnet. The method comprises the steps of receiving a voltage demand signal indicative of a desired voltage to be supplied to the electromagnet in a period and generating first and second switching signals with reference to the voltage demand signal. The first and second switching signals are then applied to the first and second switches respectively during the period thereby causing the switches to switch between on and off states to produce voltages across the electromagnet pulsed at levels of +VS, 0V and ?VS, such that the average voltage across the electromagnet during the period is substantially equal to the desired voltage.

Abstract: This invention relates to a switching circuit, such as a bridge circuit, comprising first and second switches operable to produce an electrical signal at the output of the switching circuit at certain voltages. Moreover, this invention also relates to a method of operating such a switching circuit. The switching circuit comprises an input operable to receive a DC signal of +Vs, an output, first and second switches operable in response to first and second switching signals to be switched between on and off states such that switching between various combinations of on and off states produces an electrical signal at the output with voltage pulses at levels of +Vs, 0V and ?VS and a voltage sensor for producing a signal indicative of a voltage offset in the switching circuit. Voltage effects in the switching circuit can be compensated for by using the signal produced by the voltage sensor.

Abstract: This invention relates to the operation of a switching circuit, such as a bridge circuit. The invention provides a method of generating pulsed first and second switching signals for switching first and second switches of a switching circuit further comprising an output and that receives a DC signal of voltage +Vs, wherein switching of the first and second switches produces voltage pulses of +Vs, OV and ?Vs at the output; the method comprising the steps of: receiving a voltage demand signal; and generating the first and second switching signals according to a rule that the first switching signal shall have a single pulse of a first determined width and the second switching signal shall remain in one state, the combination of the first and second switching signals producing an average voltage at the output being substantially equal to the demanded voltage.