lotus



previous page: 48 Robotics: Inertial, Acceleration and Heading sensors part1
  
page up: Robotics FAQ
  
next page: 50 Robotics: Rangefinding Devices part1

49 Robotics: Inertial, Acceleration and Heading sensors part2




Description

This article is from the Robotics FAQ, by Kevin Dowling nivek@cs.cmu.edu with numerous contributions by others.

49 Robotics: Inertial, Acceleration and Heading sensors part2

"ICSensors"

1701 McCarthy Blvd.
Milpitas, CA 95035-7416
tel: 800.767.1888
tel: 408.432.1800
fax: 408.434.6687

Model 3145. Signal Conditioned Temperature Compensated 0.5 to 4.5 Vdc
Output. 2g, 5g, 10g, 20g, 50g, 100g, 200g ranges. $230 for 1.

Model 3140: Instrumentation grade Signal Conditioned Temperature
Compensated 0.5 to 4.5 Vdc Output. 2g, 5g, 10g, 20g, 50g, 100g, 200g
ranges. $295 for 1.

Model 3031: OEM Accelerometer Piezoresistive low cost Surface mount
package. 2g, 5g, 10g, 20g, 50g, 100g, 200g, 500g ranges. $74 for 1.

Model 3021 and 3026: OEM Accelerometer Piezoresistive low cost. 2g,
5g, 10g, 20g, 50g, 100g, 200g, 500g ranges. Price ranges from $98-141
for 1, depending on g range.

"KVH Industries "

110 Enterprise Center
Middletown, RI 02840
tel: 401.847.3327
fax: 401.849.0045

also in Europe:

KVH Europe A/S
Ved Klaedebo 12
2970 Hoersholm
DENMARK
tel: +45(42)86 82 89
fax: +45(42)86 70 77

Nice small well-designed units that provide heading data. About $1K w/
RS232 adapter.

"Lucas Control Systems Products"

1000 Lucas Way
Hampton, VA 23666
tel: 800.745.8008
fax: 800.745.8004

Schaevitz Sensors, a division of Lucas, makes a variety of
inclinometers and accelerometers. the S05E is a compact, lightweight,
solid state accelerometer. NEMA 4 housing. DC -1KHz freq response,
+/-5vdc output, vibration to 20grms, less than 500mW power.

Other linear servo inclinometers and accelerometers: acceleration
ranges: +/-0.5g to +/-20g, inclinometer ranges +/-1 deg to +/- 90 deg.
Operating temperatures -55C to 95C.

"Lucas NovaSensor"

1055 Mission Court
Fremont, CA 94539
tel: 510.490.9100

Lucas makes a 1"x1"x0.5" accelerometer for about $200. Good noise
immunity but fragile.

"Murata Erie North America"

2200 Lake Park Drive
Smyrna, GA 30080
tel: 800.831.9172
fax: 404.436.3030

Gyrostar piezoelectric vibrating gyroscope. Uses equilateral
triangular prism with PE elements attached to faces of prism. High
precision compared to other vibration gyroscopes. Measures augular
velocity with good linearity. Max augular vel +/- 90 deg/sec, No
hysteresis, 58x25x25mm, 45g, output is DC voltage porportional to
angular rate. 22.2mV/deg/sec scale factor.

Gerhard Weiss has provided some results of experiments with the unit
at [131.246.192.2]: [35]Gyrostar.ps.Z

"Pewatron AG"

Hertistr. 27
CH-8304 Wallisellen, Switzerland
Tel: +41 1 830 29 44
Fax: +41 1 830 51 57

Two-axis Inclinometer. Weight: 2.3gr, voltage: 5V, current: 20mA,
dimension: 12 x 12 x 7 mm, Output: 2 analog output. Sine and cosine
for 360 degree, voltage swing: +/- 0.4V, Price: about $100. Rumored to
have a US distributor: Dinsmore. "Dinsmore Instrument Company"

1814 Remell Street
Flint MI 45806
tel: 810.744.1330
fax: 810.744.1790
net: qwae32d@prodigy.com

"Precision Navigation"

1235 Pear Avenue
Suite 111
Mountain View, CA 94043
tel: 415.962.8777
fax: 415.962.8776

TCM2 Electronic Compass Sensor Module. Digital compass - incorporates
2-axis tilt sensor. NOT A FLUXGATE COMPASS - Magneto-inductive
magnetometer technology. Electronic gimbaling, full 3-axis
information, low power consumption 5vdc @ 6-12mA. Accuracy +/- 1
degree up to 20 degrees tilt. Approx. 6x5x3 cm. -20to70C operating
temperature. RS232 interface or analog. 0-2.5V linear. 16Hz output
rate. $700.

Precision's Vector-2X electronic compass module is about $50 and
provides 2 deg accuracy, 1 deg resolution, 10Hz smapling, serial
ouput. Another product the Wayfinder is targeted for VR tracking
applications.

"Silicon Designs, Inc."

1445-NW Mall Street
Issaquah, WA. 98027-5344
tel: 206.391.8329
fax: 206.391.0446

Capacitive Accelerometers

Model 1010, Digital output:
Produces Digital pulse train in which the density of pulses (number of
pulses a second) is proprtional to applied acceleration. It operates
with a single +5 volt power supply and requires a clock of 100kHz -
1MHz. The output is ratiometric to the clock frequency and independent
of the power supply voltage. Two forms of digital signals are provided
for direct interfacing to a microprocessor or counter. This devices
comes in a PLCC package that is smaller than a penny.

Model 1210, Analog output:
Provides two analog outputs, 1-4 volts, or 4-1 volt, with O g's at 2.5
volts. The outputs can be used either differentially or single ended
referenced to 2.5 volts. Two reference voltages, +5.0 and +2.5 volts
(nominal), are required; the output scale factor is ratiometric to the
+5 volt reference voltage.

"Silicon Microstructures"

46725 Fremont Boulevard
Fremont CA. 94538
tel: 510.490.5010
fax: 510.490.1119

Model 7170 series and 7130 series capacitive accelerometers. These are
relatively large devices with built in ASIC signal processing.They
have very good accuracy specs and are pre-calibrated. They also make
pressure sensors.

"Summitt Instruments "

Ohio
tel: 216.659.3312

Three-axis accelerometer. A tiny cube just under 2.5cm on a side.
Approx $1K

"Sundance Model Products "

2427 W. Adrian St.
Newbury Park, CA 91320
tel: 805.498.8857

Lists a solid state gyro for model helicopters. The SSG/1 is 38mm x
38mm x 13mm and weighs 43g. Completely solid state with no motor or
moving parts. Claims to draw 10% of the power of a gyro with moving
parts. No drift specs.

"Inclination and Tilt Sensing" There are Electrolytic tilt sensors or
clinometers that use a a conductive fluid, not mercury, whose
resistance across various electrodes provides an analog signal
proportional to tilt angle. They're not too expensive, although they
do tend to have long settling times (up to a few seconds). A couple of
US sources:

"The Fredericks Company "

tel: 215.947.2500
fax: 215.947.7464

"Applied Geomechanics "

tel: 408.462.2801
fax: 408.462.4418

The smallest, cheapest model is 5x5x2 cm and about $250. It has a
5-terminal electrolytic cell that can measure tilt in two axes to +-20
degrees (optional +-45 degrees). The characteristic "slosh" frequency
is about 10 Hz, and it exhibits sub-second settling times and a
resolution of 0.01 degrees. The output is two analog signals (X and Y,
or Roll and Pitch, if you prefer). It runs off of a 9-volt battery.

 

Continue to:













TOP
previous page: 48 Robotics: Inertial, Acceleration and Heading sensors part1
  
page up: Robotics FAQ
  
next page: 50 Robotics: Rangefinding Devices part1