CPC F16K 37/0041 (2013.01) [B60S 1/56 (2013.01); F16K 31/0675 (2013.01); F16K 37/00 (2013.01); G01L 1/22 (2013.01); G01L 5/0057 (2013.01); G01L 5/1627 (2020.01); G01S 7/497 (2013.01); G01S 2007/4977 (2013.01)] | 15 Claims |
12. A solenoid assembly, comprising:
a plunger movable between a first position and a second position;
a spring urging the plunger to the second position, the spring having a plurality of coils; and
four strain gages fixed to four adjacent coils of the plurality of coils of the spring, the four strain gages electrically connected in a Wheatstone bridge arrangement; and
wherein a strain detected by the four strain gages indicates whether the plunger is at the second position.
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