Temperature-sensing system for cattle
First Claim
1. An apparatus for sensing temperature changes in a body comprising:
- a battery-powered signal generator for generating a signal having a variable frequency;
frequency modulating means for varying the frequency of the generated signal as a function of the level of the temperature of the body; and
amplitude modulating means for modulating the amplitude of the generated signal in accordance with a predetermined identification code to thereby tag the generated signal with an encoded amplitude waveform which identifies the body.
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Abstract
Disclosed is a device for detecting temperatures which differ from a variable norm of particular use in detecting elevated temperatures in cattle. The device, one being attached to each animal, includes a square wave generator, an identification number encoder for outputting the identification number of the particular animal in the herd, a fever detector with an ambient temperature compensating circuit which provides output only when internal temperature of the animal is above a preset value for a given ambient temperature, and a transmitter which sends the identification code to a receiver. In certain embodiments, no separate fever detector is provided; rather the square wave generator outputs a frequency-modulated signal related to the internal body temperature.
Of particular interest is the identification number encoder which intermittently outputs a preset hardwired identification code to the transmitter at periodic intervals for transmission to a receiver either at constant intervals or when temperatures sensed by a temperature detector exceed the variable norm by a preset given amount.
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Citations
15 Claims
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1. An apparatus for sensing temperature changes in a body comprising:
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a battery-powered signal generator for generating a signal having a variable frequency; frequency modulating means for varying the frequency of the generated signal as a function of the level of the temperature of the body; and amplitude modulating means for modulating the amplitude of the generated signal in accordance with a predetermined identification code to thereby tag the generated signal with an encoded amplitude waveform which identifies the body. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for sensing temperature changes in a body comprising:
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a battery-powered signal generator for generating a signal having a selectable frequency; amplitude modulating means for modulating the amplitude of the generated signal to impart an identification code onto the generated signal; frequency varying means for varying the frequency of the generated signal with the identification code modulated thereon as a function of the temperature of the body; a transmitter for association with the body; powering means for intermittently powering the transmitter; and signal providing means for providing to the transmitter the generated signal with the identification code modulated thereon and the selectable frequency determined by the temperature of the body when the transmitter is powered; wherein the transmitter transmits the generated signal with the identification code modulated thereon as received from the signal providing means. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A telemetry device for transmitting temperature data corresponding to temperature changes in a body, comprising:
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a digital signal generator for generating a digital signal having a variable bit rate; temperature change indicating means, coupled to the digital signal generator and responsive to temperature changes in the body, for changing the bit rate of the generated signal in response to a change of temperature in the body; and digital encoding means, coupled to the signal generator, for setting predetermined ones of the bits in the generated signal on or off in accordance with a predetermined identification code. - View Dependent Claims (14, 15)
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Specification