Patent PL-81814-B1 (PL)
Title: Apparatus for investigating underground boreholes[gb1364537a]
IPC: G01V11/00
Filed: 1971-09-10
Abstract: 1364537 Borehole logging apparatus T TABANYAI SZ NB NYAK and BANYASZATI KUTATË INTEZET 15 Sept 1971 [15 Sept 1970] 42959/71 Heading G1A A borehole logging apparatus for use in the presence of ignitable gas and/or ignitable dust and including a Geiger counter or scintillation detector 15 has its circuitry arranged to prevent spark formation. This is done by providing appropriate resistors in the detector high voltage supply Fig. 2 (not shown) and in the regulating circuit Fig. 3 (not shown) of the motor of a recording device B. The apparatus comprises a measuring device A, a recording device B and a measuring probe C. Power is supplied by a battery 5 charged from the mains supply 8. If the battery voltage falls below a pre-set value an automatic regulator 4 cuts off the supply to a voltage stabilizer 3 which in turn interrupts the supply to an A/D converter 2 and to the probe C. An indicator 1 is also provided to receive the output from the probe when the recording device is dispensed with. The recording device includes a read-out unit 9 and a store 10. It receives the probe output, and also, via a registering circuit 11, the output from a signal emitter 12 which indicates the distance travelled by the probe. To read the contents of the store 10 into a play-back device, the stored information is fed by the unit 9 to a D/A converter whose output provides an analog voltage curve. This curve is traced on to paper tape by the recorder. If the quality is adequate, the stored information can be erased and the now free store used for the next logging. The probe contains the detector 15 and one or more detachable source/screen arrangements 17/16. The different sources emit different types of radiation, e.g. beta, gamma and neutron and are used one at a time. Each screen/source combination is rotatable through 180 degrees and according to its position either allows the borehole wall to be irradiated or completely obstructs the radiation beam, Fig.5 (not shown).
1364537 Borehole logging apparatus TTABANYAI SZNBNYAK and BANYASZATI KUTATË INTEZET 15 Sept 1971 [15 Sept 1970] 42959/71 Heading G1A A borehole logging apparatus for use in the presence of ignitable gas and/or ignitable dust and including a Geiger counter or scintillation detector 15 has its circuitry arranged to prevent spark formation. This is done by providing appropriate resistors in the detector high voltage supply Fig. 2 (not shown) and in the regulating circuit Fig. 3 (not shown) of the motor of a recording device B. The apparatus comprises a measuring device A, a recording device B and a measuring probe C. Power is supplied by a battery 5 charged from the mains supply 8. If the battery voltage falls below a pre-set value an automatic regulator 4 cuts off the supply to a voltage stabilizer 3 which in turn interrupts the supply to an A/D converter 2 and to the probe C. An indicator 1 is also provided to receive the output from the probe when the recording device is dispensed with. The recording device includes a read-out unit 9 and a store 10. It receives the probe output, and also, via a registering circuit 11, the output from a signal emitter 12 which indicates the distance travelled by the probe. To read the contents of the store 10 into a play-back device, the stored information is fed by the unit 9 to a D/A converter whose output provides an analog voltage curve. This curve is traced on to paper tape by the recorder. If the quality is adequate, the stored information can be erased and the now free store used for the next logging. The probe contains the detector 15 and one or more detachable source/screen arrangements 17/16. The different sources emit different types of radiation, e.g. beta, gamma and neutron and are used one at a time. Each screen/source combination is rotatable through 180 degrees and according to its position either allows the borehole wall to be irradiated or completely obstructs the radiation beam, Fig.5 (not shown).
[GB1364537A]