Active Tilting Systems / 主動傾斜系統
High-speed trains utilizing active tilting systems are some of the most advanced
means of transportation in the world. An active tilting system improves the
running speeds of a train by 20-30% on curved tracks, shortening travel times
and enhancing ride comfort. Tilting trains require accurate measurements of
acceleration and tilt stabilization in order to ensure passenger comfort,
devices that can assist in preventive maintenance and health usage monitoring
and planning.
Colibrys offers a range of low g MEMS accelerometers specifically designed for
tilt sensing that use the Earth’s ground plate as a reference. Our MEMS
capacitive accelerometers are based on a bulk micro-machined silicon element, a
low power ASIC for signal conditioning and a temperature sensor.
Reliable and accurate measurements for tilting
Our MEMS capacitive sensors are renowned for their high reliability in harsh
environments and have already been qualified for safety critical railway
applications. Implementing one of our tilt sensors not only ensures accurate and
reliable readings, but also helps greatly increase the lifespan of a train, as
our products are designed to operate under harsh conditions.
The MEMS revolution
There are many sensing technologies (capacitive, piezoresistive, etc.) competing
to provide the best solution for today’s tilting sensing applications, but none
offer the same level of performance in terms of long-term stability, temperature
stability and precision as MEMS capacitive products, which are not only
qualified for safety critical applications, but are also designed to operate in
harsh environments.
Measuring tilt
The accelerometer uses the effect of Earth’s gravity (1g) on the seismic mass as
input acceleration to determine inclination. The inertial mass is the center
wafer, supporting the proof mass through the spring. The accelerometer’s output
signal (Vout) is a ratiometric analog voltage which is determined by the sum
between Bias and the product of Scale factor and Acceleration, where the Bias is
the output voltage at 0g acceleration, the Scale factor is the sensor
sensitivity and the Acceleration is the Earth’s pull (1g) applied through the
sensitive axis.
Advantages of our tilt sensors
Colibrys offers MEMS accelerometers that have an inherent high resolution, high
temperature stability and low power consumption, which makes them the perfect
high-tech solution for effectively addressing the requirements of tilt sensing
applications.
Colibrys – tilting towards innovation
Our accelerometers for tilt sensing applications are among the best products out
there in term of short-term and long-term stability, with less than 0.15mg for a
±1g full scale range, which means that they offer a stability above 0.0086° over
one year, that is without mentioning the excellent bias temperature coefficient,
low hysteresis and high repeatability.
Last but not least, our product have a killer combination of noise reduction and
bandwidth, determining the resolution or smallest measurable angle of the tilt
sensor. Colibrys products present a low noise level (20 µg/√Hz for a ±1g sensor)
and, as a result, are able to measure angles with a typical resolution of
0.0006° (RMS noise for 1Hz bandwidth).
Colibrys accelerometers for tilt sensing applications in railway
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TS9001 – our latest product
specifically designed for low g applications
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TS9002P – one of the world’s best
commercially available tilt sensor for bias stability
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