Automotive safety product suppliers are increasingly looking to force sensors as a way to achieve airbag deployment forces appropriate to the mass of the occupant and severity of the deployment situation. However, for the sensor to be useful, it has to be properly calibrated and temperature compensated. Characterizing a weight sensor typically requires the use of a dead-weight test stand (sometimes called a creep-tester) to obtain accurate and repeatable sensor loading. To get the results you want, pay attention to the following points: 1. Fixture orientation for positive and negative force loads 2. Sensor and cable orientation 3. Torque of the sensor mounting bolts 4. Weight numbering 5. Shaft-to-weight clearance (when using an automatic weight lift for removing weights from load) 6. Preconditioning the sensor and fixtures after sensor mounting 7. Monotonic application and removal of weights 8. Golden samples and data tracking (SPC).
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