Piezoelectric quartz accelerometer

• US 20090301195A1
• Filed: 10/14/2007
• Published: 12/10/2009
• Est. Priority Date: 07/09/2007
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Beijing Information Technology Institute
• Inventors: Zhang, Wei, Zhang, Fuxue
• Granted Patent: US 7,716,985 B2
• Time in Patent Office: Days
• US Class Current: 73/514.290
• CPC Class Codes: G01P 15/0907 of the compression mode type
• CPC Class Codes: G01P 15/097 by vibratory elements

Abstract

A piezoelectric quartz accelerometer comprises a sensitive element, a signal processing circuit, a base, an outer case, and a socket, wherein said sensitive element comprising two round piezoelectric quartz wafers, and a supporting frame wherein said two round piezoelectric quartz wafers are symmetrically mounted on both sides of the centre axial line of said supporting frame; said sensitive element further comprises an axial shock buffer unit and a transverse retaining unit for protecting overload of said two round piezoelectric quartz wafers; said signal processing circuit comprises an oscillation circuit for obtaining frequency signal, frequency differential forming circuit for extracting signal, phase lock and times frequency circuit for amplifying signal, compensating zero phase, compensating non-linearization and compensating temperature, and output circuit.

Claims

1. A piezoelectric quartz accelerometer comprising:

a sensitive element, a signal processing circuit, a base, an outer case, and a socket, wherein said sensitive element comprising two round piezoelectric quartz wafers, and a supporting frame wherein said two round piezoelectric quartz wafers are symmetrically mounted on both sides of the centre axial line of said supporting frame;

said sensitive element further comprises an axial shock buffer unit and a transverse retaining unit for protecting overload of said two round piezoelectric quartz wafers;

said signal processing circuit comprises an oscillation circuit for obtaining frequency signal, frequency differential forming circuit for extracting signal, phase lock and times frequency circuit for amplifying signal, compensating zero phase, compensating non-linearization and compensating temperature, and output circuit.

2. The piezoelectric quartz accelerometer, as recited in claim 1, wherein said sensitive element further comprises a first supporting frame and a second supporting frame, wherein said two piezoelectric quartz wafers are mounted between the first supporting frame and the second supporting frame in parallel, and said two piezoelectric quartz wafers comprises two lead-in wires, and two excitation circuits, wherein said two lead-in wires connect with said excitation circuits respectively.

3. The piezoelectric quartz accelerometer, as recited in claim 1, wherein said sensitive element further comprises a first supporting frame and a second supporting frame, and a flexible beam, wherein said two piezoelectric quartz wafers are connected with said flexible beam, and are mounted between the first supporting frame and the second supporting frame in parallel, and said two piezoelectric quartz wafers comprises two lead-in wires, and two excitation circuits, wherein said two lead-in wires connect with said excitation circuits respectively.

4. The piezoelectric quartz accelerometer, as recited in claim 2, wherein said sensitive element further comprises a first supporting frame and a second supporting frame, wherein said second supporting frame is on both sides of said first supporting frame, wherein said two piezoelectric quartz wafers are mounted symmetrically on the first supporting frame and the second supporting frame, and said two piezoelectric quartz wafers comprises two lead-in wires, and two excitation circuits, wherein said two lead-in wires connect with said excitation circuits respectively.

5. The piezoelectric quartz accelerometer, as recited in claim 1, wherein said axial shock absorber comprises a sensitive block and a shock pad, wherein said sensitive block is flexible, and comprises three column segments with different diameter, wherein said segment with big diameter is block having a mass adjusting block, said segment with medium diameter is elastic block, and said segment with small diameter is for mounting bolt;

said transverse retaining unit comprises a retaining frame, four adjustable retaining bolts, a retaining bolt, and a fastening bolt between said adjustable retaining bolts and said retaining bolt and said sensitive block.

6. The piezoelectric quartz accelerometer, as recited in claim 2, wherein said axial shock absorber comprises a sensitive block and a shock pad, wherein said sensitive block is flexible, and comprises three column segments with different diameter, wherein said segment with big diameter is block having a mass adjusting block, said segment with medium diameter is elastic block, and said segment with small diameter is for mounting bolt;

said transverse retaining unit comprises a retaining frame, four adjustable retaining bolts, a retaining bolt, and a fastening bolt between said adjustable retaining bolts and said retaining bolt and said sensitive block.

7. The piezoelectric quartz accelerometer, as recited in claim 3, wherein said axial shock absorber comprises a sensitive block and a shock pad, wherein said sensitive block is flexible, and comprises three column segments with different diameter, wherein said segment with big diameter is block having a mass adjusting block, said segment with medium diameter is elastic block, and said segment with small diameter is for mounting bolt;

said transverse retaining unit comprises a retaining frame, four adjustable retaining bolts, a retaining bolt, and a fastening bolt between said adjustable retaining bolts and said retaining bolt and said sensitive block.

8. The piezoelectric quartz accelerometer, as recited in claim 5, wherein said axial shock absorber comprises a sensitive block and a shock pad, wherein said sensitive block is flexible, and comprises three column segments with different diameter, wherein said segment with big diameter is block, having a mass adjusting block, said segment with medium diameter is elastic block, and said segment with small diameter is for mounting bolt;

said transverse retaining unit comprises a retaining frame, four adjustable retaining bolts, a retaining bolt, and a fastening bolt between said adjustable retaining bolts and said retaining bolt and said sensitive block.

9. The piezoelectric quartz accelerometer, as recited in claim 5, wherein said sensitive block comprises three columns with different diameter, a mass block, an elastic body, and a bolt, wherein said elastic body is a single-spiral elastic body that has a spiral spacing 2 mm-6 mm, slot width 1 mm-2 mm, inner spiral diameter 5 mm-8 mm, and outer spiral diameter 10 mm-14 mm.

10. The piezoelectric quartz accelerometer, as recited in claim 8, wherein said sensitive block comprises three columns with different diameter, a mass block, an elastic body, and a bolt, wherein said elastic body is a single-spiral elastic body that has a spiral spacing 2 mm-6 mm, slot width 1 mm-2 mm, inner spiral diameter 5 mm-8 mm, and outer spiral diameter 10 mm-14 mm.

11. The piezoelectric quartz accelerometer, as recited in claim 5, wherein said sensitive block which are manufactured as an integral part comprises mass block, double-spiral elastic body and a bolt, wherein said double-spiral elastic body has a spiral spacing 4 mm-8 mm, a slot width 1 mm-2 mm.

12. The piezoelectric quartz accelerometer, as recited in claim 8, wherein said sensitive block which are manufactured as an integral part comprises mass block, double-spiral elastic body and a bolt, wherein said double-spiral elastic body has a spiral spacing 4 mm-8 mm, a slot width 1 mm-2 mm.

13. The piezoelectric quartz accelerometer, as recited in claim 5, wherein said sensitive block which are manufactured as an integral part comprises a mass block, a “

”

-shaped elastic body with two holes, and a bolt, wherein said “

”

-shaped elastic body has a spacing 0.8 mm-2 mm, a slot width 0.3 mm-0.5 mm, a column width 1 mm-4 mm.

14. The piezoelectric quartz accelerometer, as recited in claim 8, wherein said sensitive block which are manufactured as an integral part comprises a mass block, a “

”

-shaped elastic body with two holes, and a bolt, wherein said “

”

-shaped elastic body has a spacing 0.8 mm-2 mm, a slot width 0.3 mm-0.5 mm, a column width 1 mm-4 mm.

15. The piezoelectric quartz accelerometer, as recited in claim 5, wherein said sensitive block which are manufactured as an integral part comprises a mass block, a “

”

-shaped elastic body with three holes, and a bolt 20z, wherein said “

”

-shaped elastic body with three holes has a spacing 0.8 mm-2 mm, a slot width 0.3 mm-0.5 mm, a column width 1 mm-4 mm.

16. The piezoelectric quartz accelerometer, as recited in claim 8, wherein said sensitive block which are manufactured as an integral part comprises a mass block, a “

”

-shaped elastic body with three holes, and a bolt 20z, wherein said “

”

-shaped elastic body with three holes has a spacing 0.8 mm-2 mm, a slot width 0.3 mm-0.5 mm, a column width 1 mm-4 mm.

17. The piezoelectric quartz accelerometer, as recited in claim 5, wherein said sensitive block and said supporting frame are made of spring steel, preferred as 1Cr18Ni9Ti.

18. The piezoelectric quartz accelerometer, as recited in claim 8, wherein said sensitive block and said supporting frame are made of spring steel, preferred as 1Cr18Ni9Ti.

19. The piezoelectric quartz accelerometer, as recited in claim 1, wherein said base comprises a protruding sealing positioning ring, and said sealing cover comprises a concave sealing positioning ring, which can be sealed together.

20. The piezoelectric quartz accelerometer, as recited in claim 1, wherein said base comprises a protruding sealing positioning ring that has a wedge shape, and said sealing cover comprises a concave sealing positioning ring has a wedge shape, which can be sealed together.