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  • Accelerometers

    MHS: Source date is: 28-Jul-93 09:43 EST

    Quite a while ago I solicited information about tri-axial accelerometers for
    measuring human accelerations in applications such as heel strike. I have
    gathered a summary of companies, information on their lightest accelerometers
    and cost. This information may be slightly different from what I have written
    down, or it may need completion. I do not endorse or recommend any particular
    one. That is up to you depending on your application requirements and budget.
    Thank-you for your help. I hope this is useful for your own research.



    Accelerometers: Company, Model, Features and Costs

    General Info: Time Constant = the amount of time for the signal to drop to 63%
    of the impulse signal. This constant depends on the mass of the accelerometer.
    To detect lower frequencies, larger time constants are required. With many of
    these small accelerometers a variation in temperature as small as a breeze may
    produce errors.

    Develco: (714) 892-7631 FAX (714) 897-1949.
    Contact Tim McFadden, VP of Marketing.

    Triaxial Piezo-Electric Accelerometer Model A/32

    7.5 grams with accelerometers. Approximately 14.5 mm3. A/32 is a mounting
    block which holds three A/25/E piezo-electric accelerometers in an orthogonal
    arrangement. 3 grams = mounting block, plus 1.5 grams per accelerometer.
    Capacitance based: 1.3 pC/g. Resonant frequency, X:30kHz, Y:30kHz, Z:35kHz.

    Cost: Triax 2637

    Micro-Miniature Triaxial Accelerometer Model A/38

    2.3 grams. Contains three A/28/E micro-accelerometers in a set-up similar to
    the A/32. Uses a CA/04 Charge Amplifier. 0.25pC/g. Resonant frequency >50kHz.

    Cost: Triax 3465

    Endevco: (800) 982-6732 or (714) 493-8181 FAX (714) 661-7231
    Contact James Mathews.

    Model 23, Piezoelectric

    1.7grams, 1-2000 Hz. 1% linearity. 0.4 mV/g. Need a charge converter and an

    Cost: Triax
    Charge converter 1595
    Amplifier 1300/channel

    7253 A-10 ISOTRON Accelerometer

    2.5 grams, 4Hz- . Requires current supplies #2772 (one per channel) or can be

    Cost: Triax 1395
    Current Source ?

    ENTRAN: (800) 635-0650 Contact Bob Levy.

    Three EGA-125 Series Accelerometers may be placed in a mounting block (EGA3-
    MTG) to achieve triaxial measurement. This system has a mass of 0.7 grams per
    sensor plus 10.3 grams for the aluminum mounting block for a total of 12.4
    grams. They may have other options.

    KISTLER: (716) 691-5100 Contact James Barkowski.

    8694M1 PICOTRON

    2.5 grams. Crosstalk: 5% of 4mV/g per axis. Frequency responce: 10Hz - 20kHz.
    Time constant of 0.5 seconds. Signal conditioning: #5122, gains of 1,10,100.

    Cost: Triax 1475
    Signal conditioning 695
    Cables 95
    Total $2355

    PCB Piezotronics: (716) 684-0001 FAX (716) 684-0987
    Contact Ray Limburg, Applications Engineer or Kurt Graulich, Northeast Regional
    Also may contact Northeast Engineering, Danvers, MA: (508) 774-3010,
    FAX (508)777-9008

    Miniature Triax Flexural Quartz ICP Accelerometer Model 339A11

    0.4" cube. 3.5 grams. 10mV/g, 1 to 5000 Hz (one Hertz is doubtful, 5 is more
    realistic), 100 to 1 signal to noise ratio. Accelerometer is an I-beam. No
    damping needed.For use with signal conditioner 482A16: switchable gains of 1,
    10, 100. Output is analog voltage proportional to applied acceleration:

    Cost:1 Triax, 1950.
    4 channel power supply 775.
    3 adapters 90
    3 coax cables (15') 45
    Total: $2860

    Additional: Cable 35 + 0.60/ft.
    Calibration System 1795