bias characteristic of sensor

[spman]

Hi
What means the "Bias" in specifications of a sensor? How can utilize it?
For example the bias of an accelerometer sensor is lower than 3 mg ...

 

[FvM]

I would read the number as offset value.

 

[kak111]

If sensor output signal is not zero when the measured property is zero, the sensor has an offset or bias.

Examples..........

Nitrogen Oxide sensor bias
NO sensors, require a bias voltage: typically ±150 or 300mV.
Alternatively, sensor cross-sensitivity to certain gases can be enhanced by adding a bias voltage.

Gyro bias
All gyros have an output signal bias which is the observed signal when no input is present.
In this case you can measure the gyro signal when the board is stationary.

Accelerometer bias
All accelerometers have an output signal bias this is the observed signal when no input is present.
Of course in this case no input signal is not easily obtained since we are constantly subjected to 1G of acceleration due to gravity.
Thus in the case of the accelerometers, the bias would be the difference between the observed output signal and 1G.
Obviously the accelerometer must be oriented with the axis being studied vertical.

 

[not-a-moderator]

Biasing refers to providing a voltage onto a diode or transistor junction that establishes a set amount of "conductivity" in the junction. Therefore, relating to a sensor, to bias a pin on the sensor means to provide that pin with a specific voltage, or sometimes current, to establish a specific state or condition in the sensor. Alternatively the bias of a sensor can refer to the output state of the sensor being biased referenced to another pre-determined state.