CN104569475A - Tachometer detector - Google Patents
Tachometer detector Download PDFInfo
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- CN104569475A CN104569475A CN201510000954.7A CN201510000954A CN104569475A CN 104569475 A CN104569475 A CN 104569475A CN 201510000954 A CN201510000954 A CN 201510000954A CN 104569475 A CN104569475 A CN 104569475A
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- polaroid
- light source
- light
- photoresistance
- wheelwork
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Abstract
The invention provides a tachometer detector which comprises a first chuck, a rotating device arranged below the first chuck, a bearing connected to the first chuck and the rotating device and a first polarizing film arranged on the rotating device. A light source is arranged above the first polarizing film, a second polarizing film and a photosensitive resistor are sequentially arranged below the first polarizing film from top to bottom, and the second polarizing film and the photosensitive resistor are supported by a supporting device. Light rays emitted by the light source sequentially and downwards penetrate through the first polarizing film and the second polarizing film from the center point of the light source in the vertical direction and reach the photosensitive resistor, and the photosensitive resistor is connected to the input side of a voltage follower. According to the tachometer detector, the brightness-darkness-alternate light rays are generated through polarization of light, then the rotating speed information is converted into electrical signals through a photoelectric conversion circuit, and the detector can measure the rotating speeds of rotors of a motor, an engine and the like accurately after being in match with an electronic circuit, is used for mechanical tests, high in accuracy, simple in manufacturing process, not prone to damage and low in price.
Description
Technical field
The present invention relates to a kind of velocity gauge sniffer, belong to survey instrument technical field.
Background technology
Velocity gauge and reometer, voltage table, thermometer etc. are all survey instruments.Along with industrial development, the kind of motor and engine is increasing, and a new product is out manufactured, first will through test, and the rotating speed measured under engine different operating environment is then necessary test process.
Traditional velocity gauge is divided into following several: centrifugal tachometer, magnetic tachometer, electro-dynamometer type tachometer, magnetoelectric tachometer and flash-mode tachometer gage, this several velocity gauge be all utilize rotate time produce as the physical phenomenon such as centrifugal force, electromagnetic induction indirect calculation rotating speed, this measuring method will inevitably produce error.The velocity gauge of direct measurement also has, and its principle is the reflection utilizing light, and the light that often turns around reflection once, then is got off by instrument record, although this metering system is accurate, but complex manufacturing technology, because the accuracy requirement of optical instrument is very high.
Summary of the invention
The present invention is in order to overcome the deficiency of above technology, provide a kind of velocity gauge sniffer, utilize polarisation of light and photoelectric switching circuit, change rotating signal into periodically variable electric signal, velocity gauge sniffer of the present invention meets precise requirements, and manufacture craft is simple.
The present invention overcomes the technical scheme that its technical matters adopts:
A kind of velocity gauge sniffer, comprises the first chuck, is arranged at the wheelwork below the first chuck, the bearing connecting the first chuck and wheelwork and the first polaroid be arranged on wheelwork; Be provided with light source, below above first polaroid and be disposed with the second polaroid and photoresistance from top to bottom, the second polaroid and photoresistance are supported by bracing or strutting arrangement; The light that light source sends vertically arrives photoresistance through the first polaroid, the second polaroid downwards successively from light source center point, and photoresistance is connected to the input side of voltage follower.
Preferred according to the present invention, be provided with the cavity of one end open in described wheelwork, light source is arranged in cavity, and the first polaroid is arranged at the opening part of cavity; Wheelwork periphery is provided with the current-collector be connected with light source, and the periphery of current-collector is provided with the brush contacted with it, and current-collector and brush are light source power supply.In order to make full use of the light that light source sends, between the first polaroid and photoresistance, be provided with the first light collecting barrel.
Preferred according to the present invention, described first polaroid is fixed on the periphery of wheelwork by the second chuck, and it is outer and supported by bracing or strutting arrangement that light source is positioned at wheelwork.In order to make full use of the light that light source sends, between light source and the first polaroid, being provided with the second light collecting barrel, between the first polaroid and photoresistance, being provided with the 3rd light collecting barrel.
Preferred according to the present invention, described voltage follower is made up of power supply Vc, resistance R1, R2 and triode T.
In order to strengthen the stability of rotor, described first polaroid place is provided with auxiliary bearing.
Preferred according to the present invention, be provided with convex lens in the first light collecting barrel, the second light collecting barrel and the 3rd light collecting barrel, the convex lens in described each light collecting barrel are 1-2 sheet.
Preferred according to the present invention, described first polaroid is circular; Described light source is LED light source; On described bracing or strutting arrangement, each backing positions is adjustable.
The invention has the beneficial effects as follows:
The light that the present invention utilizes polarisation of light generation light and shade to replace, the period of change of light intensity is the half of rotor swing circle, rotary speed information is changed into electric signal again by photoelectric switching circuit, this sniffer accurately can measure the rotating speed of the rotor such as motor, engine after coordinating electronic circuit, use for mechanical test, accuracy is high, and manufacture craft simply, not fragile, cost is low.In addition, this sniffer is connected with engine flywheel, by electric wire, electric signal is received in panel board, just can make automobile speed indicator.According to this principle, the tachometer gage of various engine can also be made, applied range, be suitable for producing use in enormous quantities.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1.
Fig. 2 is the structural representation of embodiment 2.
Fig. 3 is the circuit theory diagrams that light signal converts electric signal to.
In figure, the 1, first chuck, 2, wheelwork, 3, bearing, the 4, first polaroid, 5, light source, 6, the second polaroid, 7, photoresistance, 8, bracing or strutting arrangement, 9, current-collector, 10, brush, the 11, second chuck, 12, auxiliary bearing, the 13, first light collecting barrel, the 14, second light collecting barrel, 15, the 3rd light collecting barrel, 16, convex lens, 17, cavity.
Embodiment
Better understand the present invention for the ease of those skilled in the art, be described in further details below in conjunction with the drawings and specific embodiments to the present invention, following is only exemplary do not limit protection scope of the present invention.
embodiment 1:
As shown in Figure 1, a kind of velocity gauge sniffer, comprise for clamping testee rotating shaft to collect the first chuck 1 of extraneous rotation information, wheelwork 2 is provided with below first chuck, first chuck is connected by bearing 3 with wheelwork, the cavity 17 of one end open is provided with in wheelwork 2, light source 5 is arranged in cavity, first polaroid 4 is arranged at the opening part of cavity, bad owing to depending merely on bearing 3 fixed effect, in order to strengthen the stability of rotor, the first polaroid place being provided with auxiliary bearing 12, making it in High Rotation Speed, keep stable, light source 5 is provided with above first polaroid, in the present embodiment, light source adopts energy-conservation LED light source, because the light source rotated directly can not connect electric wire, wheelwork periphery is provided with the current-collector 9 be connected with light source, and the periphery of current-collector is provided with the brush 10 contacted with it, by current-collector and brush for light source 5 provides electric power, current-collector is by two metal annulus, be adhering closely on wheelwork, connect positive pole and the negative pole of brush respectively, then through wire, electricity is delivered to light source, outside wheelwork, the second polaroid 6 and photoresistance 7 is disposed with from top to bottom below first polaroid, for the ease of fixing in this enforcement, second polaroid is square, second polaroid and photoresistance are supported by bracing or strutting arrangement 8, on bracing or strutting arrangement, each backing positions is adjustable, when needing, adjustable uses, the light that described light source 5 sends is from light source center point vertically downwards successively through the first polaroid 4, second polaroid 6 arrives photoresistance 7, photoresistance is connected to the input side of voltage follower, described voltage follower is by power supply Vc, resistance R1, R2 and triode T forms.
In order to make full use of the light that light source sends, be provided with the first light collecting barrel 13 between the first polaroid and photoresistance, light collecting barrel can avoid light to spread to surrounding; Second polaroid 6 and photoresistance 7 can directly be put in the first light collecting barrel, bracing or strutting arrangement 8 supports the first light collecting barrel, be provided with 1 convex lens 16 in first light collecting barrel in the present embodiment, utilize lens imaging principle to present the real image reduced in photoresistance position like this.
The course of work of the present invention is as follows: switch on power, velocity gauge rotor turns, wheelwork 2, first polaroid 4, LED light source 5 and current-collector 9 are all followed the first chuck 1 and are rotated, second polaroid 6 and photoresistance 7 transfixion, current-collector 9 and brush 10 provide electric power for LED light source 5, LED light source sends natural light, natural light does not possess polarization state, natural light becomes linearly polarized light after the first polaroid 4, then again through the second polaroid 6, make the change that light generation light and shade replaces, because light to follow through the first polaroid 4 rear polarizer direction that rotor rotates together and the second polaroid 6 is actionless, according to formula
, the intensity of light, when through the second polaroid 6, can change, and the period of change of light intensity is the half of rotor swing circle along with rotation, so, rotating signal will become light signal, and frequency is two times of strict relations, can not produce any error in this process.As shown in Figure 3, light signal converts the circuit theory diagrams of electric signal to, Vc is power supply, R1 is divider resistance, r is photoresistance, R2 is voltage regulation resistance, triode T is negative-positive-negative transistor, Uo is output voltage, photoresistance r resistance when receiving illumination can reduce, and R1 resistance remains unchanged, the dividing potential drop of such photoresistance r changes with the change of intensity of illumination, due to the effect of voltage follower, the dividing potential drop of output voltage and r is basically identical, rotating signal is just converted to periodically variable electric signal by this, finally again the voltage signal that this circuit obtains is outputted to Subsequent electronic circuit, Subsequent electronic circuit does not relate to innovative point of the present invention, do not repeat them here.
embodiment 2:
As shown in Figure 2, a kind of velocity gauge sniffer, comprise for clamping testee rotating shaft to collect the first chuck 1 of extraneous rotation information, wheelwork 2 is provided with below first chuck, first chuck is connected by bearing 3 with wheelwork, wheelwork is provided with the first polaroid 4, first polaroid is fixed on the periphery of wheelwork by the second chuck 11, circle with holes centered by first polaroid, bad owing to depending merely on bearing 3 fixed effect, in order to strengthen the stability of rotor, auxiliary bearing 12 is provided with below the first polaroid, make it in High Rotation Speed, keep stable, it is outer and be positioned at above the first polaroid that light source 5 is positioned at wheelwork, and in the present embodiment, light source adopts energy-conservation LED light source, and light source is supported by bracing or strutting arrangement 8, outside wheelwork, the second polaroid 6 and photoresistance 7 is disposed with from top to bottom below first polaroid, in order to save material in this enforcement, second polaroid is circular, second polaroid and photoresistance are supported by bracing or strutting arrangement 8, on bracing or strutting arrangement, each backing positions is adjustable, when needing, adjustable uses, the light that described light source 5 sends is from light source center point vertically downwards successively through the first polaroid 4, second polaroid 6 arrives photoresistance 7, photoresistance is connected to the input side of voltage follower, described voltage follower is by power supply Vc, resistance R1, R2 and triode T forms.
In order to make full use of the light that light source sends, be provided with between light source and the first polaroid between the second light collecting barrel 14, first polaroid and photoresistance and be provided with the 3rd light collecting barrel 15, light collecting barrel can avoid light to spread to surrounding; Light source 5 can directly be put in the second light collecting barrel, second polaroid 6 and photoresistance 7 can directly be put in the 3rd light collecting barrel, bracing or strutting arrangement 8 supporting light sources, the second light collecting barrel and the 3rd light collecting barrel, respectively be provided with 1 convex lens 16 in second light collecting barrel and the 3rd light collecting barrel in the present embodiment, utilize lens imaging principle to present the real image reduced in photoresistance position like this.
The course of work of the present invention is as follows: switch on power, velocity gauge rotor turns, wheelwork 2 and the first polaroid 4 are all followed the first chuck 1 and are rotated, LED light source 5, second polaroid 6 and photoresistance 7 transfixion, LED light source 5 sends natural light, natural light does not possess polarization state, natural light becomes linearly polarized light after the first polaroid 4, then again through the second polaroid 6, make the change that light generation light and shade replaces, because light to follow through the first polaroid 4 rear polarizer direction that rotor rotates together and the second polaroid 6 is actionless, according to formula
, the intensity of light, when through the second polaroid 6, can change, and the period of change of light intensity is the half of rotor swing circle along with rotation; So, rotating signal will become light signal, and frequency is two times of strict relations, can not produce any error in this process.As shown in Figure 3, light signal converts the circuit theory diagrams of electric signal to, Vc is power supply, R1 is divider resistance, r is photoresistance, R2 is voltage regulation resistance, triode T is negative-positive-negative transistor, Uo is output voltage, photoresistance r resistance when receiving illumination can reduce, and R1 resistance remains unchanged, the dividing potential drop of such photoresistance r changes with the change of intensity of illumination, due to the effect of voltage follower, the dividing potential drop of output voltage and r is basically identical, rotating signal is just converted to periodically variable electric signal by this, finally again the voltage signal that this circuit obtains is outputted to Subsequent electronic circuit, Subsequent electronic circuit does not relate to innovative point of the present invention, do not repeat them here.
To sum up, in order to represent convenient, the sniffer of Fig. 1 and Fig. 2 is drawn as vertical direction, but uses when sniffer of the present invention is not limited to vertical, and various states such as can also tilting or keep flat uses.The light that the present invention utilizes polarisation of light generation light and shade to replace, the period of change of light intensity is the half of rotor swing circle, rotary speed information is changed into electric signal again by photoelectric switching circuit, this sniffer accurately can measure the rotating speed of the rotor such as motor, engine after coordinating electronic circuit, use for mechanical test, accuracy is high, and manufacture craft simply, not fragile, cost is low.In addition, this sniffer is connected with engine flywheel, by electric wire, electric signal is received in panel board, just can make automobile speed indicator.According to this principle, the tachometer gage of various engine can also be made, applied range, be suitable for producing use in enormous quantities.
Above only describes ultimate principle of the present invention and preferred implementation, those skilled in the art can make many changes and improvements according to foregoing description, and these changes and improvements should belong to protection scope of the present invention.
Claims (9)
1. a velocity gauge sniffer, is characterized in that: comprise the first chuck (1), be arranged at the wheelwork (2) below the first chuck, the bearing (3) connecting the first chuck and wheelwork and the first polaroid (4) be arranged on wheelwork; Be provided with light source (5) above first polaroid, below is disposed with the second polaroid (6) from top to bottom and photoresistance (7), the second polaroid and photoresistance are supported by bracing or strutting arrangement (8); The light that light source (5) sends vertically arrives photoresistance (7) through the first polaroid (4), the second polaroid (6) downwards successively from light source center point, and photoresistance is connected to the input side of voltage follower.
2. velocity gauge sniffer according to claim 1, is characterized in that: the cavity (17) being provided with one end open in described wheelwork (2), and light source (5) is arranged in cavity, and the first polaroid (4) is arranged at the opening part of cavity; Wheelwork periphery is provided with the current-collector (9) be connected with light source, and the periphery of current-collector is provided with the brush (10) contacted with it.
3. velocity gauge sniffer according to claim 1, is characterized in that: described first polaroid (4) is fixed on the periphery of wheelwork by the second chuck (11), and it is outer and supported by bracing or strutting arrangement (8) that light source (5) is positioned at wheelwork.
4. velocity gauge sniffer according to claim 1, is characterized in that: described voltage follower is made up of power supply Vc, resistance R1, R2 and triode T.
5. the velocity gauge sniffer according to claim 1 or 2 or 3, is characterized in that: described first polaroid place is provided with auxiliary bearing (12).
6. velocity gauge sniffer according to claim 2, is characterized in that: be provided with the first light collecting barrel (13) between the first polaroid and photoresistance.
7. velocity gauge sniffer according to claim 3, is characterized in that: be provided with the second light collecting barrel (14) between light source and the first polaroid, is provided with the 3rd light collecting barrel (15) between the first polaroid and photoresistance.
8. the velocity gauge sniffer according to claim 6 or 7, is characterized in that: be provided with convex lens (16) in the first light collecting barrel (13), the second light collecting barrel (14) and the 3rd light collecting barrel (15), the convex lens in described each light collecting barrel are 1-2 sheet.
9. the velocity gauge sniffer according to claim 1 or 2 or 3, is characterized in that: described first polaroid (4) is for circular, and described light source (5) is LED light source; Described bracing or strutting arrangement (8) each backing positions upper is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510000954.7A CN104569475A (en) | 2015-01-04 | 2015-01-04 | Tachometer detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510000954.7A CN104569475A (en) | 2015-01-04 | 2015-01-04 | Tachometer detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104569475A true CN104569475A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510000954.7A Pending CN104569475A (en) | 2015-01-04 | 2015-01-04 | Tachometer detector |
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| Country | Link |
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| CN (1) | CN104569475A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108457639A (en) * | 2018-01-16 | 2018-08-28 | 中国地质大学（武汉） | A kind of rotating speed measuring sensor suitable for deep-well |
| CN111273053A (en) * | 2020-01-22 | 2020-06-12 | 武汉船用机械有限责任公司 | Rotating speed measuring device for motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5517306A (en) * | 1994-06-15 | 1996-05-14 | Yakubovich; Evsey | Method and apparatus for measuring angular velocity of a transparent object |
| CN102692195A (en) * | 2011-03-21 | 2012-09-26 | 上海微电子装备有限公司 | Rotation angle measuring device |
| CN204347052U (en) * | 2015-01-04 | 2015-05-20 | 李珂 | A kind of velocity gauge sniffer |
-
2015
- 2015-01-04 CN CN201510000954.7A patent/CN104569475A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5517306A (en) * | 1994-06-15 | 1996-05-14 | Yakubovich; Evsey | Method and apparatus for measuring angular velocity of a transparent object |
| CN102692195A (en) * | 2011-03-21 | 2012-09-26 | 上海微电子装备有限公司 | Rotation angle measuring device |
| CN204347052U (en) * | 2015-01-04 | 2015-05-20 | 李珂 | A kind of velocity gauge sniffer |
Non-Patent Citations (1)
| Title |
|---|
| 芦圣: "基于偏振光检测的微型转速计的设计和实现", 《机电工程》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108457639A (en) * | 2018-01-16 | 2018-08-28 | 中国地质大学（武汉） | A kind of rotating speed measuring sensor suitable for deep-well |
| CN108457639B (en) * | 2018-01-16 | 2023-02-28 | 中国地质大学（武汉） | Rotating speed measuring sensor suitable for deep well |
| CN111273053A (en) * | 2020-01-22 | 2020-06-12 | 武汉船用机械有限责任公司 | Rotating speed measuring device for motor |
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Application publication date: 20150429 |