ifm electronic JN2301 - Manual (Page 14)

Inclination sensor JN
14
9.2 Euler angle (0x2044 = 1)
In this setting the two provided angle values are to be interpreted as Euler angle�
The current sensor orientation is determined by two successive rotations from the
horizontal position�
The "inclination value longitudinal" indicates the angle [°] at which the Z axis of
the sensor is inclined� The "inclination value lateral" corresponds to the angle [°] at
which the sensor was then rotated about the (inclined) Z axis�
Interpretation
The first angle value corresponds to the angle between the gravitation vector and
the sensor's Z axis (slope inclination, gradient angle) whereas the second angle
value indicates the direction in which the slope inclination matches the coordinate
system�
Value range for this option
– Inclination value longitudinal (gradient angle): -45°…+45°
– Inclination value lateral (angle of direction): 0°…360°
Critical point
With a gradient angle of 0° the sensor is in a horizontal position� In this position the
second angle (angle of direction) is useless� In practice, it is to be expected that
the value of the second angle will vary very strongly even if the sensor is virtually
motionless�
9.3 Gimbal angle X (0x2044 = 2)
As with the Euler angle the current orientation of the sensor is described by two
successive rotations from the horizontal position�
But the current orientation now arises from a rotation about the Y axis with the
angle value [°] indicated by the "inclination value longitudinal" as well as from
a rotation which then follows about the (now rotated) X axis with the angle [°]
"inclination value lateral"�
Interpretation
If you imagine the sensor as a plane whose body shows in X direction and
whose wings in Y direction, the "inclination value longitudinal" corresponds to the
longitudinal inclination of the plane (pitch angle) and the "inclination value lateral"
to the bank angle (roll angle) of the plane�
Value range
– Inclination value longitudinal: -45°…+45°
– Inclination value lateral: -45°…+45°
Critical point
With a longitudinal inclination of ± 90° ("plane" flies vertically downwards or
upwards) the roll angle makes a rotation about the gravitational axis which cannot