Recent FAQs

Recent FAQs
  • Can’t I use cheap fluorescent tubes rather than LEDs?

    Can’t I use cheap fluorescent tubes rather than LEDs?

    We don't recommend fluorescent lights, (even those with high-frequency ballasts to avoid 50Hz strobing):

    They have a short operational life, a large amount of variation in brightness over their life and with ambient temperature.

    They are generally non-industrial in design and are slow to turn on and reach maximum brightness.

    This leads to unreliability of inspection, extra complexity in the software and a requirement to constantly alter settings or re-calibrate.

  • What are the main differences between the different IR wavelengths

    What are the main differences between the different IR wavelengths

    With 850 nm infrared most standard CCD chips have a significantly higher sensitivity for these wavelengths.

    Infrared at 880 nm: Standard IR wavelength for most LED lighting and the optimal wavelength in conjunction with many filters.

    Infrared 950 nm: Primarily for machine vision applications in the semiconductor industry -> light penetrates slightly into the semiconductor material and can thus produce special surface effects.

  • What do you mean by “working distance”?

    What do you mean by “working distance”?

    Working distance or WD is the distance between the test object [your component] and the front of the lens that it imaging the object. It is very important for determining the relative positions of the object and the lens/camera. Extra optical components, for example filters, protection glass, Prisms and mechanical accessories must be included in the calculation (these shorten the optical path). The working distance is normally given in mm.

  • What is a entocentric or standard lens?

    What is a entocentric or standard lens?

    Entocentric refers to the 'normal' perspective, i.e. the optical properties of such a lens corresponds to how the human eye works. The farther away an object is, the smaller it appears, this phenomenon arises because of the way the lens bends the light beams to reach the imaging sensor.
    With these lenses, the magnification changes with varying working distances therefore entocentric or standard lenses are only suitable for non-measurement applications. Often with the lower priced lenses other types of distortion can also be found, especially towards the edges of the lens
    These lenses can be sucessfully applied to color, presence, completeness, surface inspections, as well as characters, code and feature recognition.

  • What is a Smart Camera?

    What is a Smart Camera?

    Smart cameras are complete, embedded vision systems. These compact, robust units contain all elements required for image processing as well as communication and interaction with other automation and the user. Smart cameras contain:

    • Industrial grade imaging sensor
    • frame-grabber
    • image memory
    • Powerful processor (DSP)
    • PLC I/O - 24V
    • Interfaces - Ethernet, RS232
    • High speed trigger
    • Video output
    • Image processing software

    See this video

  • What is a telecentric lens?

    What is a telecentric lens?

    Telecentricity is a special case where the principal optical rays are parallel to the lens's optical axis. In an object-side telecentric, the lens on the object side (as opposed to the camera side) principal rays are parallel to the optical axis, this eliminates perspective errors . An object is always displayed the same size at different working distances, i.e. the magnification does not change with varying working distances. Telecentric lenses are generally used where distance and location of the test object can affect the measurement accuracy and are ideal for precision measurement applications. Due to the parallel beam path telecentric lenses can be used to image critical and awkward optical surfaces and material properties for example high gloss, optically active materials, variable edge shapes, glass etc.

  • Which Linux distribution do the VC-Z cameras use

    Which Linux distribution do the VC-Z cameras use

    Debian is the Linux distribution used in the VC-Z range of smart cameras. Debian is a well known, commonly used and very well supported distribution opening up a huge range of possibilities on the VC-Z platform