CN1110402A - Contact type object detecting head - Google Patents
Contact type object detecting head Download PDFInfo
- Publication number
- CN1110402A CN1110402A CN 94107679 CN94107679A CN1110402A CN 1110402 A CN1110402 A CN 1110402A CN 94107679 CN94107679 CN 94107679 CN 94107679 A CN94107679 A CN 94107679A CN 1110402 A CN1110402 A CN 1110402A
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- CN
- China
- Prior art keywords
- contact
- piezoelectric element
- chip type
- type piezoelectric
- detecting head
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The present invention relates to a contact probe. It can be used for detecting liquid, solid (including particle or powder material) and various mixtures. Because said invention successfully solves the problem using electronic method to detect powdered and granulated materials and can be used in high electrostatic environment where the capacitance level meter doesn't work, said invention can be made into various level meters.
Description
The present invention is a kind of contact type object detecting head, can survey liquid, solid (comprising graininess or Powdered) and various potpourri, because the present invention has successfully solved the difficult problem that the puzzlement people are Powdered for many years and granular material is surveyed with electronic method.And can use at the inoperable high static environment of capacitive level probe.Therefore this probe can be made multiple level meter.
The invention is characterized in: when utilizing the chip type piezoelectric element to contact with other object, its quality factor and resonance frequency this principle that changes is judged its existence by the method for frequency discrimination or amplitude discrimination.And can judge states of matter according to the degree of chip type piezoelectric element width of cloth change frequently.
The invention process main points are as follows:
1, the detection of liquid and liquid mixture
Its resonance frequency changes than the quality factor variation obviously when the chip type piezoelectric element contacts with liquid, so can use the method for frequency discrimination to make probe separately.As shown in Figure 1.
2, the detection of solid (comprising graininess or Powdered)
When the chip type piezoelectric element contacts with solid, marked change all takes place in its quality factor and resonance frequency, but the former is the most obvious, even make the blocking of oscillator, therefore circuit can be designed to the form of easier failure of oscillation, when making it contacting to a certain degree arranged with solid matter with regard to failure of oscillation, so make circuit simpler, sensitive, reliable.As shown in Figure 2.
Can a shared oscillator when 3, if the present invention is used for the multiple spot continuous probe, circuit be further simplified.As shown in Figure 3.
If 4 measured objects are corrosive, then probe must be except that anti-corrosion material or install the protection washer additional, in case directly contact with testee and be corroded.
5, the present invention migrates " a vibration sounding " and is " vibration sensing ", so all can make the chip type piezoelectric element produce self-oscillatory circuit all to can be used for the present invention.Now enumerate 5 and implement circuit of the present invention (these circuit are repeatedly optimized, and have simple, reliable characteristics of easily making).
Fig. 4 is a contact cut-off type circuit (referring to contact with material).Fig. 5 is a contact conducting type circuit.Fig. 6 is to use the liquid sensing circuit of the chip type piezoelectric element that has the feedback district.Fig. 7 is the liquid sensing circuit that can use the chip type piezoelectric element of not being with the feedback district.Fig. 8 is exclusively used in the circuit that plug-in type multiple spot thing position is surveyed, can directly replace capacitive level probe in some occasion, has not drift of parameter, media variations does not influence the characteristics of detection accuracy, especially be useful for the even medium of density unevenness, detection accuracy can reach 5cm, because this circuit adopts single oscillation source, so the respectively interference between probe can not occur.Fig. 9 is the probe synoptic diagram, and its design feature is that protection washer centre has a projection to contact with chip type piezoelectric element center, and provides certain precompression by compression spring, and piezoelectric patches does not leave projection during with the vibration of assurance piezoelectric patches.So not only play the effect of protection piezoelectric element but also increased the probe detection sensitivity.Wherein:
The screening glass of 1-band projection; The 2-shell; The 3-resonator cavity;
The 4-piezoelectric element; The 5-compression spring.
Claims (3)
1, the present invention migrates the function of piezoelectric element " vibration sounding " to be a kind of contact type object detecting head of " vibration sensing function ".Its quality factor and resonance frequency change when it is characterized in that utilizing the chip type piezoelectric element to contact (contact be meant the chip type piezoelectric element directly contacts with testee or by diaphragm, screening glass indirect contact) with object principle is surveyed object by the method for amplitude discrimination and frequency discrimination.
2, according to the protection washer of claim 1 defined, it is characterized in that: there is a projection centre, and projection should contact with the chip type piezoelectric element is middle, and certain precompression will be arranged.
3, protection washer and the chip type piezoelectric interelement that has a projection according to claim 2 provides certain precompression by compression spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94107679 CN1110402A (en) | 1993-06-28 | 1994-06-27 | Contact type object detecting head |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93107484 | 1993-06-28 | ||
| CN93107484.3 | 1993-06-28 | ||
| CN 94107679 CN1110402A (en) | 1993-06-28 | 1994-06-27 | Contact type object detecting head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1110402A true CN1110402A (en) | 1995-10-18 |
Family
ID=25743044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94107679 Pending CN1110402A (en) | 1993-06-28 | 1994-06-27 | Contact type object detecting head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1110402A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103038612A (en) * | 2010-07-28 | 2013-04-10 | 恩德莱斯和豪瑟尔两合公司 | Device for determining and/or monitoring a prescribed fill level |
-
1994
- 1994-06-27 CN CN 94107679 patent/CN1110402A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103038612A (en) * | 2010-07-28 | 2013-04-10 | 恩德莱斯和豪瑟尔两合公司 | Device for determining and/or monitoring a prescribed fill level |
| US9377343B2 (en) | 2010-07-28 | 2016-06-28 | Endress + Hauser Gmbh + Co. Kg | Apparatus for determining and/or monitoring a predetermined fill level |
| CN103038612B (en) * | 2010-07-28 | 2016-08-03 | 恩德莱斯和豪瑟尔两合公司 | For determining and/or monitor the equipment of predetermined material position |
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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 | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |