Silicon Sensing CRS09-01

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Silicon Sensing CRS09-01
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1 Silicon Sensing

From the Silicon Sensing website:

The business was formed in 1999 to supply motion sensing solutions to high-volume automotive markets - but can trace its ancestry back to the early days of Sperry Gyroscope. Sumitomo Precision Products' advanced MEMS fabrication technology combines with Atlantic Inertial Systems' patented solid state gyro and inertial systems knowledge to manufacture and supply angular rate sensors (gyros) and inertial systems. Today, Silicon Sensing has an outstanding reputation for the development and production of innovative technology and the high volume production of reliable and affordable sensors, deployed across a diverse range of commercial and automotive applications.

Please feel free to include your experiences as signed edits to this article.

1.1 Technology

Inertial sensors measure (typically rate or acceleration) in inertial space. In other words, a fixed frame relative to some large slow moving body such as the Earth. Gyroscopes typically include a proof mass which doesn't move in inertial space. The measured rate is a rate relative to this inertial proof mass.

Over the past couple of decades solid state MEMS device have replaced the older spinning gyros in Silicon Sensing's technology. MEMS gyros incorporate a vibrating proof mass instead of a spinning mass.

1.2 Silicon Sensing's VSG Resonators

Silicon Sensing states that their technology is a "Vibrating Structure Gyro". The picture on their website shows a resonating ring that deforms over time. Some sort of vibrating proof mass is necessary in all MEMS gyros.

1.2.1 VSG-3 Inductive Resonator

The VSG-3 is the third generation of VSG sensor with approximately 3 million VSG-3 gyros are produced.

1.2.2 VSG-4 Capacitive Resonator

Silicon Sensing states that the VSG-4 is their latest (4th) generation of the VSG series gyro. They consider this to be an evolution of their resonating ring MEMS structure.

1.3 Applications

In many aerospace and automotive the angular rate is very important. In an automobile, an angular rate above a certain threshold could be used to trigger a roll-over sensor. A sustained rate over time could be integrated in order to determine an angular threshold (such as 45 deg) for roll-over detection. Obviously these same sensors can be used to determine when the automobile is spining. In aerospace, the angular rate can be used for pointing compensation.

Silicon Sensing lists the following applications for their sensors:

  • Segway
  • Mobile Antennas
  • Avionics
  • Agriculture
  • Automotive
  • Vehicle Stability

1.4 Silicon Sensing's CRS09-01 Notes

A low-noise high-performance gyro for demanding applications such as stabilisation, navigation and testing.

2 CRS09 Series -- CRS09-01

2.1 Performance Data

Table 1: CRS09 Series -- CRS09-01 Performance Specifications
Angular Axes Rate BW (Hz) Rate Saturation (deg/sec)

Uniaxial

55

200

Rate Sensor with BW of 55 Hz


2.2 Environmental Data

Table 2: CRS09 Series -- CRS09-01 Environmental Specifications
Rated Angular Rates (deg/sec) Angular Rate Technology Operating Temperature (F)

200.00

Silicon Ring Technology

-40 to 85


2.3 Data for Sensors similar to the CRS09 Series -- CRS09-01

Table 3: CRS09 Series -- CRS09-01 - Similar Sensors
Product Name Rated Angular Rates (deg/sec) Rate BW (Hz) Maximum Dimension (in) Weight (lb)

CRS09 Series -- CRS09-01

200.00

55.00

2.48

0.13

Single Axis Gyro -- CRS03-01S

100.00

10.00

1.14

0.04

Single Axis Gyro -- CRS03-11S

573.00

55.00

1.06

0.02

CRG20 Series -- CRG20-02

300.00

55.00

0.37

0.00

CRG20 Series -- CRG20-01

75.00

55.00

0.37

0.00

CRS09 Series -- CRS09-01

200.00

55.00

2.48

0.13

Single Axis Gyro -- CRS10 Analogue

75.00

75.00

0.91

0.02

Single Axis Gyro -- CRS05-01

50.00

80.00

1.77

0.02

CRS09 Series -- CRS09-02

100.00

55.00

2.48

0.13

CRG20 Series -- CRG20

300.00

55.00

0.37

0.00

Single Axis Gyro -- CRS03-02S

100.00

10.00

1.14

0.04


3 Generic Sensor Model

Basic Sensor Model

For proposals and early design phases the sensor is best modeled with a simple linear approach. In later design phases where the nonlinear aspects of the sensor response cna be modeled. This is frequently unnecessary unless the limits of your sensors and controllers are being pushed.

The simple model starts with a transfer function that represents the frequency response of the sensor. In addition to the frequency response of the sensor noise is modeled (simple band-limited white noise or PSD derived time history noise). Sensors are usually designed (and electronics or software added) to provide a linear response.

3.1 Sensor Noise

Generic Random Noise Model

Most vendors provide noise measured on the sensor's output. (Be careful some vendors provide noise on the sensor input.) Noise will limit system performance. Noise passes straight through your control system to your output.

3.2 Nonlinear Models

Nonlinear models of sensors typically include Quantization effects and hard nonlinearities from software. Software thresholds can cause abrupt step changes to the output or to a control signal; these are what I am calling hard nonlinearities. Obviously these hard nonlinear steps can cause abrupt transient errors in the system. The abrupt steps will cause transients which need to settle before the system perofrmance will return to the expected behavior.

Nonlinear models are typically much more difficult to model. Validation is even more difficult and time consuming. Save these for later development stages where lots of test data can be taken and you have weeks or months to really dive into the data.



4 Possibly Stale Data Disclaimer

This data was collected in Sept. and Oct. of 2008. As time progresses this data may become obsolete or stale.

Please be careful how you use this data. It may be useful in an educational sense but system design decisions should be made using the manufactuerer's website only.

4.1 Data Quality Disclaimer

I've collected this data from various websites including sites that are not the manufactuerer's.

Use the data for reference only and double check the performance parameters before making any vital decisions.