FLOTATION TECHNIQUE FOR CALIBRATION OF LOW-LEVEL ACCELEROMETERS
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A TECHNIQUE FOR COUNTERACTING THE ADVERSE EFFECTS OF THE EARTH'"'"''"'"'S GRAVITATIONAL FIELD ON THE LABORATORY CALIBRATION OF LOW-LEVEL ACCELEROMETERS. THE ONE-G FORCE OF THE GRAVITY TIONAL FIELD IS WHOLLY OR PARTLY COMPENSATED AS DESIRED BY IMMERSING THE PROFF MASS OF THE ACCELEROMETER IN A STATIONARY DENSE GAS WHICH, IN ACCORDANCE WITH ARCHIMEDES PRINCIPLE, PRODUCES A BUOYANT FORCE ON THE PROOF MASS EQUAL TO THE WEIGHT OF THE DISPLACED GAS AND ACTING PARALLEL AND OPPOSITE TO THE GRAVITATIONAL FORCE. THE ACCELEROMETER AND FLOTATION FLUID ARE CONTAINED IN A SEALED CHAMBER HAVING MEANS FOR CONTROLLING THE CHAMBER VOLUME AND THEREBY PRESSURE AND DENSITY OF THE GAS. A SERVO SYSTEM DERIVING ITS INPUT FROM A GAS DENSITY SENSOR IN THE CHAMBER ACTUATES THE CHAMBER VOLUME CONTROL TO AUTOMATICALLY MAINTAIN THE GAS DENSITY CONSTANT AT A SELECTED VALUE.
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