Characterisation, Measurement & Analysis
+44(0)1582 764334

FAQ

  • Lambda website issues

    The Lambda website was recently updated with some minor cosmetic changes and an improvement to the search function. If the Lambda Home page now looks a little strange or the images and text are out of alignment it could mean that you need to clear your web browser cache.

    There are different instructions depending on which web browser you use, however the website below has instructions for all of the common browsers:

    Refresh Your Cache instructions website

    If you still have issues please contact us by email or call us on 01582 764334

  • Web Order Payment Methods

    Lambda can accept the following payment methods for website orders:

    • Credit card, handled by Sagepay or PayPal
    • PayPal, either Express Checkout or Standard Checkout
    • Purchase Order number, from customers with an existing account with us


    If none of the above are appropriate for you, please call us on +44 (0) 1582 764334

    or email contact@lambdaphoto.co.uk

  • ElectroViewer 7215 FAQ

    Q: Can I see an infrared laser beam in “mid-air” with my ElectroViewer?
    It is a misconception that an IR viewer can be used to view infrared laser beams in “mid-air”. However, as with the beam from a flashlight, if dust particles are in the beam path, the beam will become partly visible. Ordinarily, IR viewers can be used to see the projection of the infrared beam spot on a flat diffusing surface such as a white card.

    Q: How sensitive is my ElectroViewer?
    The minimum detectable signal for a near-infrared viewer depends upon a large number of factors, namely: the wavelength of incident radiation (μm), the power density (density of radiation in μW/cm2 at the faceplate), the effective aperture of the objective lens, the distance between the spot and the viewer, the time duration of the signal (pulsed or continuous), the reflectivity of the diffusing surface, the sensitivity of the human eye or device used in viewing the output of the IR viewer. With detailed information on all these relevant factors and the spectral response characteristic (shown on the ElectroViewer Technical Data Sheet), the viewing performance can be precisely calculated. As an approximation, the following are the minimum power densities required to view an infrared laser beam from a distance of approximately one meter: 30μW/cm2 for a 1.06μm laser, 600μW/cm2 for a 1.3μm laser, and 10 mW/cm2 for a 1.5μm laser diode. Other intermediate values can be estimated by considering the spectral response characteristic.

    Q: How much more sensitive is the ElectroViewer 7215P over the standard 7215?
    The Premium extended ElectroViewer is a “selected” version of the 7215 and exhibits exceptional performance at longer wavelengths. In both versions, the photocathode material is cesium-based exhibiting an S1 spectral response characteristic. However, the improved performance is due to lower noise levels rather than higher sensitivity at longer wavelengths.

    Q: How does the ElectroViewer 7215 compare with a CCD camera?
    Firstly, it is important to note that the ElectroViewer 7215 is a Viewer and not a video camera. The image output is not rasterized and can only be viewed optically; there is no electronic signal output. (Video output from the 7215 can be obtained with the use of the video relay lens adapter, part number 7215-202). Because CCD cameras utilize silicon-based detectors, certain models can be used to observe near-infrared radiation at wavelengths up to about 1.1μm. However, because these cameras are designed for optimum performance in the visible wavelength range, as a result, they exhibit mediocre performance in the near-infrared range. Image bleeding, blooming, low sensitivity and low contrast imaging are some of the observed characteristics. The ElectroViewer produces significantly better results for viewing radiation at wavelengths longer than about 0.75μm.

    Q: How can I use the ElectroViewer 7215 to align an infrared emitter and detector separated by a distance?
    Since the ElectroViewer 7215 cannot see laser beams in mid-air, to align a narrow laser beam so that it illuminates an infrared detector located at some distance away, we recommend the following procedure:

    1) Start at the infrared emitter side.

    2)  Place a white card (such as a white business card) in the beam path and view the diffuse reflection of the beam on the card.

    3)  Follow the beam from the emitter to the detector by moving the card along the beam path and viewing the reflection with the ElectroViewer. If the distance between the emitter and detector is very far (one mile, for example), it may be more expedient to begin at the detector and view the emitter. Although this is a more difficult alignment procedure, in the latter situation, moving the emitter will brighten and darken the beam as viewed at the detector.

    Q: Do I need to use eye safety goggles when I use the ElectroViewer?
    YES. An IR Viewer is not a replacement for eye-safety equipment. It is not designed to withstand high power laser beams. In fact, the ElectroViewer has been designed to accommodate the use of these goggles and still permit a clear view of the infrared image.

    Q: What happens when the 7215-202 CCD relay lens is used on 2/3" cameras?
    The 7215-202 was designed for use on 1/2" format CCD cameras. If this relay lens is used on a 2/3" camera, the video image will vignette and show an infrared image surrounded by a dark circle. The circle will have a diameter approximately equal to the picture width (so only the corners of the image will show dark). If the 7215-202 relay lens is used on a 1/3" CCD camera, the center of the image will be magnified and no vignetting will appear. Note that the 7215-202 has been designed for use on C-mount cameras — not CS-mount. For the use on the latter, a 5mm spacer will be required.

    Q: Why are there small black spots in the image of my IR viewer?
    Small black spots can be found for several reasons. Because the image converter tube utilizes high voltage signals, the front and back face plates very often attract dust. These can easily be removed with a cotton swab or lens cleaning cloth. In addition, because of the manufacturing processes involved in producing all similar electro-optical devices, sometimes very small cosmetic blemishes can actually occur inside the image converter tube. These black spots do not affect the performance or reliability of the near-infrared viewer. We select only those image converters that have blemishes smaller than the maximum size constraints shown in the image below. For example, a blemish in the central part of the image can only be as large as 0.13mm (<2% of the screen size).

    SofEC-FAQ_ElectroViewer7215-v08.pdf

     

     

     

     

  • LATAB Strobe Controllers Q&A

    Q: Tell me more about the LATAB Strobe Controllers.

    Like the lighting heads they are designed in a black aluminum housing. The controller is enabled for plug and play. Just connect the LATAB lighting head and the controller automatically identifies the lighting type by an electronic sensor and gives the maximum light intensity to the lighting head. The strobe pulse is adjustable in 16 steps. The light intensity can also be adjusted. Increasing the light intensity up to 200 % at 50 and 100 µsec strobes can be selected by internal jumper. The controllers are supplied with 5 m power/ trigger cable by default.

    Q: What are the General Specifications for the LATAB Strobe Mode Controllers?

    • Supply voltage 24: VDC +/- 10%, max. 2,5 A
    • Power output: max. 1 A / 3 A
    • Light intensity: 0 - 100% internal potentiometer
    • Strobe pulse: 50 - 1500 µsec in 16 steps
    • Trigger input: 5 - 24 V, optically isolated
    • Trigger frequency: max. 200 Hz
    • Operation temperature: 0 - 65 °C
  • LATAB Continuous Mode Controllers Q&A

    Q: What are the General Specifications for the LATAB Continuous Mode Controllers?

    • Supply voltage: 24 VDC +/- 10%, max. 2,5 A
    • Power output: max. 1 A / 3 A
    • Light intensity: 0 - 100% internal potentiometer
    • Trigger input: 5 - 24 V, optically isolated
    • Trigger frequency: max. 200 Hz
    • Operation temperature: 0 - 65 °C

     

    Q: Are LATAB light heads and controllers suitable for industrial use?

    The product features of the LATAB controllers are numerous: designs suitable for industrial use, adjustable light intensity, up to 4 channels, PC operation via Ethernet, PC RS-232 or stand alone. Continuous or strobe operation mode, with adjustable pulse durations from 50 µs to 1.5 ms. Other durations can be requested.

    Q: Am I able to test / evaluate LATAB lighting?

    LATAB have developed a demo controller/laboratory tester enabled for plug and play. Simply connect the LATAB light head and the controller automatically limits the output current to the specified maximum for the connected light head. All adjustments can be done from the front panel. The demo controller can operate in both continuous and strobe modes:

    • Continuous mode: normal as well as external on/off control
    • Strobe mode: internal or external trigger. Strobe time from 0.001-1.5msec
    • Trigger frequency: adjustable internal generator; 1-50Hz or external up to 200Hz.
    • Light intensity range: (i) 0-100% @ strobe time 0.001–1.5msec; (ii) 0-200% @ strobe time max. 100

     

    There are over 3500 different light heads in the LATAB range. Clearly we cannot have every unit in our evaluation stock pool – if we cannot provide you with the exact model you require we will provide you with the closest technical specification available. Please use ‘Get in touch’ or call one of our Machine Vision Engineers on 01582 764334 to make these arrangements.

  • Baumer TXD Series Q&A

    Q: What protocol does the Baumer TXD use for data transfer?
    The TXD series uses the standardized DCAM protocol (IIDC V1.31) for data transfer, which enables simple connection of the cameras either using the Baumer-GAPI generic program interface or other image processing software which supports this standard.

    Q: Are the Baumer TXD’s backward compatible?
    Backwards compatibility means that the older IEEE 1394a standard is also supported.

    Q: Are the Baumer TXD’s available in colour?
    No. Baumer withdrew the colour cameras in 2013. For colour FireWire cameras within the Baumer range please see the TXF series.

    Q: What is the difference between the Baumer TXD and TXF ranges?
    The TXD series uses the standardized DCAM protocol (IIDC V1.31) for data transfer, that enables simple connection of the cameras either using the Baumer GAPI generic program interface or other image processing software which supports this standard.

    Developed later are the TXF series with optimized FireWire™ cameras especially for use in industrial systems. The cameras with the Baumer FCAM driver apply a secure protocol, asynchronous data transfer and so, as well as providing a higher level of system security, benefit from maximum exploitation of the bus bandwidth of up to 80 MBytes/sec.

    Q: Do you have CAD drawings available for the cameras you stock?
    Yes, we have CAD drawings for all our cameras. Please use the ‘Get in Touch’ to request the information you require quoting the manufacturer and model of the camera.

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