CN1588095A - Piezoelectric accelerometer preamplifier - Google Patents
Piezoelectric accelerometer preamplifier Download PDFInfo
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- CN1588095A CN1588095A CN 200410054126 CN200410054126A CN1588095A CN 1588095 A CN1588095 A CN 1588095A CN 200410054126 CN200410054126 CN 200410054126 CN 200410054126 A CN200410054126 A CN 200410054126A CN 1588095 A CN1588095 A CN 1588095A
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- output terminal
- shell
- piezoelectric accelerometer
- amplification circuit
- electric charge
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Abstract
The invention is a piezoelectric accelerator front amplifier with charge amplifier function, which belongs to oscillation sensor field. The front amplifier includes a jack, output end insulator, output end shell, charge amplification integrated circuit, input end insulator, button, pin, connecting shell. The amplifier can change the high input impedance of the normal piezoelectric accelerator into low input impedance, the invention is simple, and the cost is low, convenient.
Description
Technical field
The present invention proposes a kind of piezoelectric accelerometer prime amplifier, and this device can be installed on the piezoelectric accelerometer and also dismounting from it easily, and the high input impedance with piezoelectric accelerometer changes low input impedance into simultaneously, belongs to the piezoelectric sensor field.
Background technology
Vibration is modern various engineering, as the key property of the various designs of guided missile, aircraft, boats and ships, automobile, bridge and even dykes and dams and buildings.Any object all has vibration, an object of size reflection of vibratory output, the operation conditions of an equipment.In all kinds of seismological sensors, piezoelectric accelerometer is little, in light weight with its size, (advantage such as 0.5～20000Hz) is widely used wide frequency range.In vibration monitoring to aeromotor, shipping high speed diesel engine, metallurgical system and thermoelectric generator etc., the various forms of piezoelectric accelerometers of all bound use.
Piezoelectric accelerometer is a piezoelectric effect of utilizing piezoelectric ceramics, crystalline material, converts mechanical energy to electric energy.When piezoelectric accelerometer was subjected to oscillating action, the size of its output voltage was directly proportional with suffered vibration acceleration.Yet the output signal of common piezoelectric accelerometer has only by the signal conversion and could be measured by the General Instrument metering device.
A kind of signal transform mode commonly used at present is to be connected with instrument and meter after output signal is input to charge amplifier again.This connected mode has increased charge amplifier in sensor and instrument and meter, increased greatly to install and the process of debugging, the carrying out of unfavorable and fast detecting.This in addition charge amplifier generally needs dependence on import, and the price of each charge amplifier has increased the measurement cost greatly generally more than several thousand dollars.
Summary of the invention
The prime amplifier that the present invention proposes has solved an above-mentioned difficult problem, and it is small and exquisite to have proposed a kind of volume, simple in structure, is convenient to make, and cost is lower, the piezoelectric accelerometer prime amplifier that is easy to load and unload.This apparatus structure never appears in the newspapers with contact.
As shown in Figure 1, the present invention is made up of 1-jack, 2-output terminal insulator, 3-output terminal shell, 4-electric charge amplification circuit, 5-input end insulator, 6-knob, 7-contact pin, eight parts of 8-link shell.
The 1-jack is the interface of signal output, and it links to each other with the positive pole of 4-electric charge amplification circuit, and the signal that is exaggerated and handles of output directly flows to testing meter and instrument.Connecting interface still uses the standard interface of common piezoelectric accelerometer.This jack also will link with external direct current power supply simultaneously, for the electric charge amplification circuit provides necessary operating voltage.
2-output terminal insulator is the reasonable materials of insulating property, makes anodal output and the earth insulate, and needs certain elasticity, can tighterly thickly connect 1-jack and 3-output terminal shell like this.
3-output terminal shell stainless steel commonly used or copper process, and the output screw thread can be metric system M5, M6 screw thread.3-output terminal shell and 8-link shell are to adopt extruding to be connected, and also can or be weldingly connected with bonding agent connects.It also must be pressed on 4-electric charge amplification circuit the inside of 8-link shell simultaneously, moreover, and in the earthing pole conducting formation loop of seal face and 4-electric charge amplification circuit.
The ultimate principle figure of 4-electric charge amplification circuit is made up of transistor, resistance, input end, output terminal and substrate as shown in Figure 2.Transistor is made of technotron and low noise twin-stage transistor npn npn, the grid of field effect transistor is as output terminal and by resistance R G ground connection (being connected with 8-link shell with 3-output terminal shell), the collector C of drain D and bipolar transistor is as output terminal (being connected with the 1-jack), emitter e is by resistance R e ground connection, output terminal not only is connected with power supply but also as output line, constitutes two-wire system mechanism.
The material of 5-input end insulator, form are consistent with 2-output terminal insulator, only size are adjusted, and are used to connect 7-contact pin and 8-link shell, and play insulating effect.
The 6-knob is to be used for fixing 5-input end insulator, prevents that it from fluctuating, and knob adopts with being connected of shell and is threaded.
The 7-contact pin will directly be connected as input channel with sensor, and links with the input stage of 4-electric charge amplification circuit.This contact pin and 1-jack all need the copper product processing that electric conductivity is better and have certain elasticity and wearing quality.
8-link shell adopts M5 or M6 metric thread to connect in the piezoelectric accelerometer top.
It is simple, easy to use that the charge amplifier that the conventional piezoelectric accelerometer that this invention is compared is used has connection, and greatly reduce cost and reduced the characteristics of using such as space.The user can be used as several common piezoelectric accelerometers the piezoelectric accelerometer that integrated circuit is housed in the body and use, and the cost of manufacture that can save charge amplifier makes common piezoelectric accelerometer have more widely and uses.
Description of drawings
A kind of piezoelectric accelerometer prime amplifier structural drawing that Fig. 1 proposes for the present invention.1-jack, 2-output terminal insulator, 3-output terminal shell, 4-electric charge amplification circuit, 5-input end insulator, 6-knob, 7-contact pin, 8-link shell.
Fig. 2 is the ultimate principle figure of electric charge amplification circuit.
Embodiment
After piezoelectric accelerometer is fixed on the determinand surface, directly be threaded onto prime amplifier on the piezoelectric accelerometer and connect test lead after can detect.
Claims (4)
1, a kind of piezoelectric accelerometer prime amplifier is characterized in that comprising jack (1), output terminal insulator (2), output terminal shell (3), electric charge amplification circuit (4), input end insulator (5), knob (6), contact pin (7), (8) eight parts of link shell.
2, by the described a kind of piezoelectric accelerometer prime amplifier of claim 1, it is characterized in that jack (1) links to each other with the positive pole of electric charge amplification circuit (4), connect by the output terminal insulator between jack and the output terminal shell (3), the output terminal shell adopts extruding cooperation or bonding agent or welding manner to be connected with link shell (8), the earthing pole of output terminal shell and electric charge amplification circuit is conducted and constitutes the loop, be connected by the input end insulator between contact pin (7) and the link shell, contact pin is connected with the input utmost point of electric charge amplification circuit.
3,, it is characterized in that described electric charge amplification circuit is made up of transistor, resistance, input end, output terminal and substrate by claim 1 or 2 described a kind of piezoelectric accelerometer prime amplifiers.
4, by claim 1 or 2 described a kind of piezoelectric accelerometer prime amplifiers, the material that it is characterized in that described output terminal insulator and input end insulator is engineering plastics or fluoroplastic, and its size is according to the size decision of contact pin and jack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410054126 CN1289912C (en) | 2004-08-30 | 2004-08-30 | Piezoelectric accelerometer preamplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410054126 CN1289912C (en) | 2004-08-30 | 2004-08-30 | Piezoelectric accelerometer preamplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588095A true CN1588095A (en) | 2005-03-02 |
| CN1289912C CN1289912C (en) | 2006-12-13 |
Family
ID=34603058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410054126 Expired - Fee Related CN1289912C (en) | 2004-08-30 | 2004-08-30 | Piezoelectric accelerometer preamplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1289912C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655430A (en) * | 2013-11-25 | 2015-05-27 | 中航商用航空发动机有限责任公司 | Cooling type vibration signal sensing device |
-
2004
- 2004-08-30 CN CN 200410054126 patent/CN1289912C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655430A (en) * | 2013-11-25 | 2015-05-27 | 中航商用航空发动机有限责任公司 | Cooling type vibration signal sensing device |
| CN104655430B (en) * | 2013-11-25 | 2018-01-26 | 中国航发商用航空发动机有限责任公司 | Cooled vibration signal sensing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1289912C (en) | 2006-12-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061213 Termination date: 20100830 |