ifm electronic JN2100 v.2.0 - Manual (Page 17)

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Inclination sensor JN
17
Value range for this option
– Inclination value longitudinal (gradient angle): -90°…+90°
– Inclination value lateral (angle of direction): 0°…360°
Critical point
With a gradient angle of 0° or 180° 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�
7.6.3 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: -90°…90°
– Inclination value lateral: -180°…180°
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
be detected by the inclination sensor� In this condition the "inclination value lateral"
is insignificant� In practice, the "inclination value lateral" will vary very strongly
when it is close to this condition even if there is only little movement�
7.6.4 Gimbal angle Y (0x2044 = 3)
This setting corresponds to the setting described in 7�6�3 with the difference that
the order of the two rotations is now inverted�
In this option the measured object is first rotated about its x axis with the angle [°]
"inclination value lateral"� The measured object is then rotated about the y axis
(which is now inclined) with the angle value [°] indicated by the "inclination value
longitudinal" of the sensor�
As a result of this the measured values of the gimbal angle X and the gimbal angle
Y are identical as long as the measured object is only rotated about one of the
sensor's axes� The measured values of the two options do not differ until a general
rotation is made about the two sensitivity axes�