Self calibrating environmental condition sensing and recording apparatus
US4195349A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Jan 26, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L27/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for measuring and recording environmental conditions in a deep bore hole using a down hole gauge including pressure and temperature sensors and data processing elements is disclosed. A pressure transducer such as a Bourdon tube is provided for measuring the down hole pressure. An encoder coupled to the pressure transducer produces a plurality of data bits defining a coded word representative of the down hole pressure. A temperature transducer is also provided for measuring the down hole temperature. An oscillator is coupled to the temperature transducer for providing a timing signal having a frequency which is proportional to the down hole temperature. Serial shift registers are provided for recording data bits in separate groups of bits defining data words which are representative of the down hole pressure and temperature conditions. Temperature information is integrated into each data word by sequentially gating the pressure data bits into a serial shift register at a rate which is proportional to the frequency of the temperature-dependent timing signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.