SOLID STATE ANGULAR RATE GYRO
ARS-C122-1A
ARS-C132-1A
ARS-C142-1A

ARS

This solid-state angular rate gyro has a sensing mechanism consisting of piezoelectric bender elements in a "tuning fork" configuration. The drive elements are resonantly driven in opposite directions. When a rotation occurs, the momentum stored in the vibrating elements causes an out-of-plane bending force (called Coriolis force) that is demodulated to accurately represent the rotation rate.

These angular rate gyros have no moving parts, no detectable hysteresis, quick startup, and are low cost since the gyro is electronic rather than mechanical. The preferred configuration made by Watson Industries is a piezoelectric assembly that senses angular rates about its long axis. There is no significant hysteresis or threshold in the angular rate gyro since there is no rotating mass or friction. Resolution is system noise limited to 15mV RMS maximum at 50 Hz bandwidth. The effects of external noise on the gyro are minimized with the unique "tuning fork" design that responds to rotational motion and rejects linear motion associated with vibration.

Since vibration normally contains angular motion as well as linear motion, care should be taken when mounting the angular rate gyro to keep this rotational signal isolated (a 0.01° rotation in 0.01 seconds is equivalent to 1°/second). The absence of moving parts gives the angular rate gyro sensor its durability and long life.

Multiple axis, custom power and special performance specification versions of this sensor are also available.

Watson angular rate gyros have traveled in space, visited the Titanic, and have been used by every U.S. car company. Watson Industries, Inc. has sold tens of thousands of sensors all over the world. The Angular Rate Sensor is used for instrumentation and control for robotics, head and limb motion testing, virtual reality, ship stabilization, automotive testing, and remotely piloted vehicles.

Specifications
Angular Rate
	Range:	±100°/sec	Up to ±500°/sec available
	Analog Scale Factor:	10°/sec/V (Typical)	See table below
	Scale Factor Accuracy:	1%	Constant temperature
	Scale Factor Temp Coefficient:	3%
	Bias: Zero Bias	< 1.5°/sec (Typical)	See table below
	Bias: Over Temp Range	±10°/sec (Typical)	See table below
	Warmup Drift:	< 2%	Full scale range
	Non-Linearity:	< 0.05%	Full scale range
	Bandwidth:	50 Hz
	Noise:	< 0.1% rms	Full scale range
Environmental
	Temperature: Operating	-20°C to +50°C
	Temperature: Storage	-55°C to +85°C
	Vibration: Operating	2.5g rms	20 Hz to 2 kHz
	Vibration: Survival	10g rms	20 Hz to 2 kHz
	Shock: Survival	500g	10mS ½ sine wave
Electrical
	Input Power: Positive	12 to 16VDC	0.2W
	Input Power: Negative	-12 to -16VDC	0.2W
	Input Current:	10mA @ ±15VDC
	Analog Output:	±10VDC
	Output Impedance:	1000 Ohm
Physical
	Size: Including Mounting Flanges	1.13"Wx3.00"Lx2.07"H	2.9x7.6x5.3 (cm)
	Weight:	2oz (0.1lb)	60 grams (0.1Kg)
	Connection:	Wire Bundle
	Life:	> 50,000 Hrs MTBF
•	Specifications are subject to change without notice.
•	This product may be subject to export restrictions. Please consult the factory.

Watson Industries ARS Models*
Model		Range		Output		Scale Factor		Zero Bias		Bias Over Temperature
ARS-C122-1A		±30°/sec		±10VDC		3°/sec/V		<0.5°/sec		±5°/sec
ARS-C132-1A		±100°/sec		±10VDC		10°/sec/V		<1.5°/sec		±10°/sec
ARS-C142-1A		±300°/sec		±10VDC		30°/sec/V		<4°/sec		±25°/sec
*Custom ranges are available.

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