This disclosure relates generally to an optical strobing based multi-frequency vibration measurement, and more particularly to systems and methods for autonomous stroboscopic machine inspection for multi-point and multi-frequency vibration measurement. Embodiments of the present disclosure provide for an optical strobing based multi-frequency vibration measurement by selecting a strobe frequency, obtaining one or more image frames, obtaining a marker position, calculating a fast fourier transformation, obtaining one or more peak prominent frequencies, obtaining a product set of the one or more peak prominent frequencies, optimizing the strobing frequency where the value of the product set of the one or more peak prominent frequencies is not equal to an optimum pre-defined system value and detecting and measuring a plurality of vibrations of multiple frequencies by applying a chinese remainder theorem on the product set and the strobe frequency set.

A vibration measurement device 10 includes an excitation unit (signal generator 11 and vibrator 12) for exciting an elastic wave to an inspection target S, an illumination unit (wavelength stabilized laser beam source 13 and illumination light lens 14) for performing stroboscopic illumination to a measurement region of a surface of the inspection target S using a wavelength stabilized laser beam source 13, a displacement measurement unit (speckle-sharing interferometer 15) for collectively measuring a displacement of each point of the measurement region in the back-and-forth direction by speckle interferometry or speckle-sharing interferometer. By using the wavelength stabilized laser beam source 13, an interference image can be obtained even when the inspection target S has large surface irregularities.

An apparatus for checking tyres described as a linear camera having an objective line lying on an optical plane; a first, a second and a third light source for emitting respectively a first, a second and a third light radiation; a command and control unit for selectively activating at least one from among the first, second and third light source and activating the linear camera in order to acquire a two-dimensional image of a linear surface portion of the tyre synchronously with the activation of the first, second and third source. The first and second light source lie on opposite sides of the optical plane. Furthermore, the first, second and third light source include each one or more sub-sources each having a respective main extension direction parallel to the optical plane and the distance of the sub-sources of the third light source from the optical plane is less than the distance of the first and second light source from the optical plane.

A strobe light system for use with a camera, the strobe light system including an LED light source, a triggering signal input for the reception of a triggering signal, an electrical power source and a control circuit. The control circuit is coupled to the LED light source. The control circuit has a first transistor and a second transistor. The first transistor, the second transistor and the LED are electrically in series with the electrical power source. The first transistor is controlled to establish an electrical power level that is to be conducted through the LED. The second transistor being subject to the triggering signal to thereby electrically conduct for a predetermined amount of time thereby establishing an electrical current pulse through the LED.

A container inspection device and a container inspection device for inspecting containers are provided. The container inspection device comprises at least one light source for illuminating containers in an inspection clock for inspecting the containers. The container inspection device drives the at least one light source such that the at least one light source is observed by a person as constantly shining independent of the inspection clock.

The amount of light to be emitted by an auxiliary light source for capturing an image to which correction processing is applied, as well as a parameter used in the correction processing, is determined based on a degree of shadows of an object to be captured using the auxiliary light source. In this way, shadows in an image obtained through image capture using the auxiliary light source can be appropriately corrected with a simple method.

A container inspection device and a container inspection method for inspecting containers are provided. The container inspection device comprises at least one light fixture for illuminating containers at a predetermined inspection instant of time for inspecting the containers, and an electrical line for connecting the at least one light fixture to an electrical energy supply and to a bus system, so that the electrical line serves both to supply the at least one light fixture with electrical energy and to connect with a real time data network.

A system for providing an automatically focused image comprises an imaging system including a high speed periodically modulated variable focal length (VFL) lens, a VFL lens controller, a VFL-projected light source, a focus determining portion, an exposure timing adjustment circuit, and an exposure strobe time controller. The focus determining portion comprises an optical detector that inputs reflected VFL-projected light that is projected to, and reflected from, a workpiece through the VFL lens, and provides a focus deviation signal. The exposure timing adjustment circuit provides an exposure timing adjustment signal based on the focus deviation signal, which indicates a time when the imaging system focus Z-height approximately coincides with the workpiece surface Z height. The exposure strobe time controller uses the exposure timing adjustment signal to adjust the image exposure time so the imaging system focus Z-height coincides with the workpiece surface Z height at the adjusted image exposure time.

The amount of light to be emitted by an auxiliary light source for capturing an image to which correction processing is applied, as well as a parameter used in the correction processing, is determined based on a degree of shadows of an object to be captured using the auxiliary light source. In this way, shadows in an image obtained through image capture using the auxiliary light source can be appropriately corrected with a simple method.

A system and a method for inspecting a stream of products (3, 3, 3) is disclosed, comprising a scanning focused light beam (5) for scanning the product stream and a camera (7) for detecting light beams directly returned from the scanned product stream, whereby the scanning movement of the focused light beam is synchronized with the exposure time of the camera.