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APPARATUS FOR MONITORING TEST ANIMAL ACTIVITY

  • US 3,803,571 A
  • Filed: 10/24/1972
  • Issued: 04/09/1974
  • Est. Priority Date: 10/21/1971
  • Status: Expired due to Term
First Claim
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1. Apparatus for determining the activity of different groups of test animals located within an enclosure, comprising:

  • actuator means carried by the test animals, said means having a different electrical conductivity-magnetic permeability, characteristic for each group;

    coil means located within the enclosure such that the test animals and actuators carried thereby can be brought closely adjacent thereto during natural movement of the animals;

    alternating voltage source means connected to said coil means;

    circuit means for generating a signal each time an animal carrying an actuator is immediately adjacent said coil means, said circuit means including separate detector means for each animal group individually responsive to the impedance change in Said coil means produced by an animal with actuator of the corresponding group being located nearby for producing a unique signal identifying the animal as to group.

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