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  • Light gates - replies

    On July 4, 1997, I posted an inquiry regarding the purchase of
    light gates (photo cells). The following is a list of the replies. Sorry
    for the lateness of this return (the lakes stay warm for only a few
    months), and thanks again to all those who replied. Very much


    Lafayette Instruments makes an infrared photo cell. They did make an
    incandencent light photo cell, like the ones I use, but I couldn't find
    them in the catalog I have. The price list I have, which is a couple of
    years old, has them for $280 (US). Their contact information is below.

    Lafayette Instruments
    P.O. Box 5729
    3700 Sagamore Parkway North
    Lafayette, Indiana 47903
    (800)428-7545 Phone
    (317)423-4111 FAX

    A graduate student I advise is studying gait speed in patients with low
    back pain. In addition to average velocity, he wants to know the
    durations of steps and strides. He is using an instrument called
    GENLOCK which puts a small digital clock in the corner of the
    camcorders view and runs displays the time in hundredths of seconds.
    The clock is recorded on the videotape. He then plays the tape on a
    slow motion VCR and records the times. I don't have the information on
    the manufacturer of the GENLOCK, but if you think you would like more
    information on it, let me know and I will look it up.

    Good luck!

    Bruce Etnyre, Ph.D., P.T. _/_/_/_/ _/_/_/_/ _/_/_/ _/_/_/_/
    Human Performance and _/ _/ _/ _/ _/ _/ _/
    Health Sciences Dept. _/ _/ _/ _/ _/ _/
    Rice University _/_/_/_/_/ _/ _/ _/_/_/ _/
    6100 Main MS 545 _/ _/ _/ _/ _/ _/
    Houston, Texas 77005 _/ _/ _/ _/ _/ _/
    USA _/ _/ _/ _/ _/ _/ _/ _/ _/ _/_/_/_/ _/_/_/ _/_/_/_/ _/_/
    FAX: (713)285-5329



    I am not sure if this company carries what you need but they may be able to
    point you in the right direction:

    1207 Maple St.
    P.O. Box 65310
    West Des Moines, IA, 50265
    (800) 280 6933
    (515) 225 6933
    Fax: (515) 225 0063

    They carry Photo electric sensors that are used for a variety of purposes.
    Good Luck!
    % Juan C. Garbalosa, Ph. D., PT
    % Assistant Professor
    % University of Hartford
    % Department of Physical Therapy
    %200 Bloomfield Ave
    % West Hartford, CT 06117
    % USA

    % Phone (Work): (203) 768 5371
    %Fax (Work):
    % email:


    Hey Kevin:

    We use light gates from a company in Plano, Texas:


    Good luck.

    Tyler A. Kress, Ph.D.
    The University of Tennessee
    153 Alumni Memorial Building
    Knoxville, TN 37996-1506
    Phone: (423) 974-3333
    Fax: (423) 974-0588


    Hi Kevin,
    I had the similar experience when trying to acquire one for our lab.
    Here is what I did. I purchased photocells from Cutler-Hammer
    (1-800-833-3927) and a digital clock from Kessler Ellis Products
    (1-800-631-2165) and wired it up myself. I cost about $500.00 total and works
    great. I think Lafayette Instruments makes a total package (sensors and
    timers) but I think that it is more expensive (about $1,000).

    If you need more specifics, please e-mail me directly.

    Tom Kernozek, Ph.D.
    University of Wisconsin - LaCrosse
    Physical Therapy Department


    We do a large amount of custom instrumentation for Indiana University
    Human Performance Laboratories and many others. If you are unable to
    locate devices that will work for you we may be able to design some
    relatively inexpensive ones for you. Please feel free to contact us at
    any time at locations below.

    Dwight H. Hector, Ph. D.
    __________________________________________________ ________________

    HECTOR ENGINEERING CO., INC. Phone 812-876-5224
    123 E. Dewey, P.O. Box 566 FAX 812-876-5223
    Ellettsville, IN 47429 E-mail
    __________________________________________________ ________________



    There are several companies that make light curtains. Is that what you're
    looking for? Or are you looking for basic timing lights? If you could tell
    me more about what you're trying to do I'll be glad to point you to
    companies that I'm aware of. Also what kind of response time and accuracy
    do you need? I am writing a paper on timing light accuracy and have learned
    a lot about overall accuracy. Are you looking for a "turn-key" system or
    components to integrate into an existing system?

    Tom Westenburg
    US Olympic Committee


    Dear Kevin,
    Your Email below has been referred to us.

    Please refer our home page
    In our products section you will find our Kinematic Measurement System,
    please read same.
    You can download an instruction manual from this product section
    together with a full operating demonstration software system that will
    perform exactly the functions you require plus a whole lot more.
    In brief the left shift key on your PC is used as a simulation switch in
    your instance simulating as many number of timing gates that you
    require. Remember from the pull down menu you must 'insert' a subject
    name & body weight prior to any test.

    Any queries please Email me.

    Ian Crossing

    Fw: light gates...
    Mon, 7 Jul 1997 16:17:58 +1000
    "Robert Newton"
    "Fitness Technology"

    > -------------------------------------------------------------------

    Hi Kevin

    I don't have addresses and being in the UK that may not be a problem.
    We have found that light gates developed for security systems are
    cheap and effective. Commercial ones we were using earlier seemed to
    require a minimum amount of time for interruption of the signal.
    While this would not be a problem for studies of locomotion, our need
    was for something to indicate the onset of fast movements, i.e.
    ball's or clubs.

    Typically, the security ones are TTL compatible and very simple to

    Hope this helps

    Frank Eves

    School of Sport and Exercise Sciences
    University of Birmingham
    Birmingham B15 2TT

    Tel: +44 (0)121 414 4133
    Fax: +44 (0)121 414 4121