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Electronic recording accelerometer

  • US 4,114,450 A
  • Filed: 10/31/1977
  • Issued: 09/19/1978
  • Est. Priority Date: 10/31/1977
  • Status: Expired due to Term
First Claim
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1. Apparatus for sensing and recording, for subsequent retrieval, environmental data such as shock, temperature and relative humidity, comprising, in combination:

  • a substantially ruggedized case for housing said apparatus in the form of a simulated parcel and including a power source therein for operating said apparatus over a predetermined period of time such as the time required for shipping said case from one destination to another;

    a plurality of environmental data sensors located in said case and being operable to be responsive at least to shocks encountered bidirectionally along three mutually perpendicular axes and providing respective analog output signals having amplitudes which are a measure of the magnitude of the respective shocks encountered;

    analog signal multiplexer circuit means coupled to said plurality of data sensors and being operable to provide a repetitive multiplexed sequence of data signal samples of said analog output signals;

    electrical circuit means coupled to said signal samples and being responsive thereto to classify each of said data signal samples by means of voltage comparator circuit means into amplitude windows of predetermined increments and including encoding means for generating a multi-bit digital code word corresponding to the largest amplitude window reached by each data signal sample;

    a statistical digital memory coupled to said electrical circuit means and having a respective addressible memory location for each digital code word and being operable to statistically count and store in binary format at each memory location the number of respective digital code words generated over a predetermined sampling period;

    a time tagged digital memory coupled to said electrical circuit means and having time dependent addressible memory locations for a predetermined number of sampling periods and being operable in one mode to selectively store in binary format the largest value of a code word occurring within at least one sampling period and in another mode to store in binary format the number of time periods wherein code words of less than a minimum amplitude window are generated; and

    means coupled to said digital memory for selectively reading out on demand the binary formats of said memory locations for generating statistical and time histories of the data stored therein.

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