MICROBAROGRAPH Russian patent published in 1995 - IPC

FIELD: geophysics and seismology. SUBSTANCE: microbarograph has an aneroid sensitive element in the form of membrane box 1, light emitter 4, photoelectric converter 5 with electric measuring circuit, recording unit 20, temperature compensator made in the form of bushing 10 and rigidly coupled with one of the surfaces of membrane box 1. To the other surface of box 1 mask 2 with a slot is rigidly attached, mask 2 being interposed between light emitter 4 and photoelectric converter 5. The device furthermore has null correction mechanism made in the form of a differential screw pair formed by screw 11 the head of which is rigidly coupled with bushing 10 and adjusting screw 12 with external and internal threads of different pitches. Screw 12 is screwed into the nut 13 pressed in base 8. The head of screw 11 is rigidly coupled with nut 13 with the aid of bellows 14. Rest 7 is made of material a linear temperature expansion coefficient of which is less than the same of material of bushing 10. Enhanced accuracy in recording atmosphere pressure is provided due to use of rigid coupling of the sensitive element with light system and temperature compensation system and due to null correction. EFFECT: enhanced accuracy. 2 dwg