CN105242059A - Rotating speed measuring instrument by means of visual persistence and lens imaging principle, and measuring method thereof - Google Patents
Rotating speed measuring instrument by means of visual persistence and lens imaging principle, and measuring method thereof Download PDFInfo
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- CN105242059A CN105242059A CN201510656213.4A CN201510656213A CN105242059A CN 105242059 A CN105242059 A CN 105242059A CN 201510656213 A CN201510656213 A CN 201510656213A CN 105242059 A CN105242059 A CN 105242059A
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- 230000002688 persistence Effects 0.000 title claims abstract description 19
- 238000003384 imaging method Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000007 visual effect Effects 0.000 title abstract description 4
- 230000004888 barrier function Effects 0.000 claims description 10
- 230000005622 photoelectricity Effects 0.000 claims description 10
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 2
- 238000000827 velocimetry Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000002490 cerebral effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
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Abstract
The invention discloses a rotating speed measuring instrument by means of visual persistence and a lens imaging principle, and a measuring method thereof. The rotating speed measuring instrument comprises a measured object, a convex lens, a timer and a pedestal. The convex lens is arranged between the measured object and the timer. The measured object is provided with a light shielding sheet, a photoelectric door is disposed outside the light shielding sheet, and the photoelectric door is connected to the timer through a lead. The pedestal is equipped with a chute, and the convex lens and the timer are arranged in the chute. Light emitted from the measured object forms a clear image on the measured object. The measuring method comprises the following steps: firstly, enabling the timer to form a clear image on the measured object; and secondly, selecting the timer or the photoelectric door for timing according to the rotating speed of the measured object, and calculating the rotating speed by means of a formula. The rotating speed measuring instrument can more accurately measure whether the rotating speed of an object at a low rotating speed is changed or the like when the object is rotating a round, and also can measure the average rotating speed of an object at a medium or high rotating speed.
Description
Technical field
The present invention relates to a kind of tachometric survey instrument and measuring method, in particular, relate to a kind of the tachometric survey instrument and the measuring method that utilize persistence of vision and lens imaging principle.
Background technology
Speed-measuring method conventional both at home and abroad at present has photoelectric code disk velocimetry, Hall element velocimetry, centrifugal tachometer velocimetry, tech-generator velocimetry, leakage field velocimetry, flash of light velocimetry and vibration velocimetry.These methods generally can both compare accurate measurement to the rotating speed of high-speed rotation object, but generalized case draws rotating speed after being the rotation that measurement one is enclosed or a circle is above, or have Part Methods higher to coaxially concentric requirement.
Visual persistence phenomenon and suspenopsia phenomenon, also known as sunset glow effect, human eye is when observing scene, and light signal imports cerebral nerve into, need through one of short duration period, and after the effect of light terminates, visual image does not disappear immediately, and this residual vision claims after image.Convex lens is that object is placed on outside focus, at the real image that convex lens opposite side becomes to stand upside down, real image have reduce, etc. large, amplify three kinds, object distance is less, and image distance is larger, and real image is larger.
Summary of the invention
Technical matters to be solved by this invention is the defect overcoming prior art, provides a kind of the tachometric survey instrument and the measuring method that utilize persistence of vision and lens imaging principle.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: the tachometric survey instrument utilizing persistence of vision and lens imaging principle, described tachometric survey instrument comprises testee, convex lens, timer and base, described convex lens are located between testee and timer, described testee is provided with light barrier, be provided with photoelectricity door outside described light barrier, described photoelectricity door is connected with timer by wire; Described base is provided with chute, and described convex lens, timer are located in chute, the light that described timer sends formed on testee clearly as.
Described convex lens, timer position in chute is adjustable, and described timer turns upside down to being shown as of time, and described testee surface is black, post groove pad pasting on the surface, described groove pad pasting is white, and described groove adhesive cover size is adjustable, and described groove pad pasting quantity is 1 ~ 6.
Utilize the measuring method of the tachometric survey instrument of persistence of vision and lens imaging principle, comprise the following steps:
1) regulate testee, convex lens, timer in the position of base, make timer formed on testee clearly as;
2) as testee rotating speed < 0.5r/s, testee arranges n symmetrical groove pad pasting, and n=2 ~ 6, make testee rotate, and utilize timer record to be respectively t through the time of symmetrical grooves pad pasting
1, t
2, pass through formula
calculate testee at this
rotating speed in circle;
As testee rotating speed 0.5r/s ~ 24r/s, testee arranges 1 groove pad pasting, the timing number of turns is respectively the 1st circle, the 2nd circle, the 3rd circle, the 4th circle, the 5th circle, the 6th circle; 1st circle time showing is t
1, the 2nd circle time showing is t
2, the 3rd circle time showing is t
3, the 4th circle time showing is t
4, the 5th circle time showing is t
5, the 6th circle time showing is t
6, pass through formula
calculate the rotating speed of testee;
As testee rotating speed > 24r/s, carry out timing by photoelectricity door and light barrier to testee, the timing number of turns is respectively the 1st circle, the (n+1)th circle, and 2n+1 encloses, and 3n+1 encloses, and 4n+1 encloses, and 5n+1 encloses, and the 1st circle time showing is t
1, the (n+1)th circle time showing is t
2, it is t that 2n+1 encloses time showing
3, it is t that 3n+1 encloses time showing
4, it is t that 4n+1 encloses time showing
5, it is t that 5n+1 encloses time showing
6, pass through formula
calculate the rotating speed of testee.
Beneficial effect of the present invention is: (1) realizes the heed contacted measure to rotating speed; (2) slow-speed of revolution object can be measured more accurately in rotation one circle process, whether occur rotating speed change etc.; (3) centering height rotating speed object can be realized to be averaged the measurement of rotating speed; (4) time that rotation one is enclosed or multi-turn is actual used can be known; (5) to paste mass of object light, not easily affect object rotating speed.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
In figure: testee 1, convex lens 2, timer 3, base 4, chute 5, groove pad pasting 6, light barrier 7, photoelectricity door 8.
Embodiment
Now in conjunction with the accompanying drawings and embodiments proposed by the invention utilize the tachometric survey instrument of persistence of vision and lens imaging principle and measuring method are described in further detail.
The tachometric survey instrument utilizing persistence of vision and lens imaging principle of the present invention, described tachometric survey instrument comprises testee 1, convex lens 2, timer 3 and base 4, described convex lens 2 are located between testee 1 and timer 3, described testee 1 is provided with light barrier 7, be provided with photoelectricity door 8 outside described light barrier 7, described photoelectricity door 8 is connected with timer 3 by wire; Described base 4 is provided with chute 5, and described convex lens 2, timer 3 are located in chute 5, the light that described timer 3 sends formed on testee 1 clearly as.
Described convex lens 2, timer 3 position in chute 5 is adjustable, being shown as of described 3 pairs of times of timer is turned upside down, described testee 1 surface is black, posts groove pad pasting 6 on the surface, and described groove pad pasting 6 is for white, size is adjustable, quantity is 1 ~ 6.
Groove pad pasting 6 is made up of black and white two parts, and design groove pad pasting 6 can Enhancement test effect, realizes the shielding at black region of the light that sends timer 3, and in the enhancing of white portion display.When groove pad pasting 6 rotates with testee 1, although there is the irradiation of light, only just demonstrate the time at white portion, due to the eye storage characteristic of human eye, just can read the time of white portion display.
The light planoconvex lens 2 that timer 3 sends normally shows after acting on groove pad pasting 6 white portion, and at black region, because black is to the absorption of ruddiness, black region can not demonstrate the time.Like this when testee 1 rotates, only have when groove pad pasting 6 white portion turns over irradiated site, just show if having time.When the double displaying time of white portion, testee 1 just in time rotates one week, and the mistiming of twice is exactly the time that testee 1 rotates one week, namely the rotation period of testee 1, and then just can calculate the rotating speed of testee 1 rotation.
Utilizing the tachometric survey instrument of persistence of vision and lens imaging principle when measuring, comprising the following steps:
1) regulate testee 1, convex lens 2, timer 3 in the position of base 4, make timer 3 formed on testee 1 clearly as;
2) as testee 1 rotating speed < 0.5r/s, testee 1 arranges n symmetrical groove pad pasting 6, n=2 ~ 6, testee 1 is rotated, utilizes timer 3 to record and be respectively t through the time of symmetrical grooves pad pasting 6
1, t
2, pass through formula
calculate testee 1 at this
rotating speed in circle;
As testee 1 rotating speed 0.5r/s ~ 24r/s, testee 1 arranges 1 groove pad pasting 6, the timing number of turns is respectively the 1st circle, the 2nd circle, the 3rd circle, the 4th circle, the 5th circle, the 6th circle; 1st circle time showing is t
1, the 2nd circle time showing is t
2, the 3rd circle time showing is t
3, the 4th circle time showing is t
4, the 5th circle time showing is t
5, the 6th circle time showing is t
6, pass through formula
calculate the rotating speed of testee 1;
As testee 1 rotating speed > 24r/s, carry out timing by photoelectricity door 8 and light barrier 7 pairs of testees 1, the timing number of turns is respectively the 1st circle, the (n+1)th circle, and 2n+1 encloses, and 3n+1 encloses, and 4n+1 encloses, and 5n+1 encloses, and the 1st circle time showing is t
1, the (n+1)th circle time showing is t
2, it is t that 2n+1 encloses time showing
3, it is t that 3n+1 encloses time showing
4, it is t that 4n+1 encloses time showing
5, it is t that 5n+1 encloses time showing
6, pass through formula
calculate the rotating speed of testee 1.
The present invention to survey rotating speed can be mean speed after a circle rotates, also can be the rotating speed during 1/n circle be less than in a circle situation, also can be the mean speed after multiple rotations simultaneously.Each picture can carry out record by camera technique, and is calculated by above-mentioned computing method.
Embodiment
By tachometric survey instrument after arranging adjustment, the rotary speed being applied in Bohr's resonance Instrument is measured, and display effect is normal, and measurement data result is as follows:
Table 1 testee 6 time showing values
| Number of times | 1 | 2 | 3 | 4 | 5 | 6 |
| Time showing value/s | 3.60 | 5.11 | 6.61 | 8.10 | 9.62 | 11.13 |
Thus, the rotating speed of testee
As can be seen from measurement result, this group data achieve the measurement to Pohl resonator phase disk rotating speed, and measuring method is directly perceived, easy, have very wide application.
Claims (8)
1. one kind utilizes the tachometric survey instrument of persistence of vision and lens imaging principle, it is characterized in that, described tachometric survey instrument comprises testee (1), convex lens (2), timer (3) and base (4), described convex lens (2) are located between testee (1) and timer (3), described testee (1) is provided with light barrier (7), described light barrier (7) outside is provided with photoelectricity door (8), and described photoelectricity door (8) is connected with timer (3) by wire; Described base (4) is provided with chute (5), and described convex lens (2), timer (3) are located in chute (5), the light that described timer (3) sends testee (1) upper formed clearly as.
2. the tachometric survey instrument utilizing persistence of vision and lens imaging principle according to claim 1, is characterized in that, described convex lens (2), timer (3) position in chute (5) is adjustable.
3. the tachometric survey instrument utilizing persistence of vision and lens imaging principle according to claim 1, is characterized in that, described timer (3) turns upside down to being shown as of time.
4. the tachometric survey instrument utilizing persistence of vision and lens imaging principle according to claim 1, is characterized in that, described testee (1) surface is black, posts groove pad pasting (6) on the surface.
5. the tachometric survey instrument utilizing persistence of vision and lens imaging principle according to claim 4, is characterized in that, described groove pad pasting (6) is white.
6. the tachometric survey instrument utilizing persistence of vision and lens imaging principle according to claim 4, is characterized in that, described groove pad pasting (6) size is adjustable.
7. the tachometric survey instrument utilizing persistence of vision and lens imaging principle according to claim 4, is characterized in that, described groove pad pasting (6) quantity is 1 ~ 6.
8. the measuring method utilizing the tachometric survey instrument of persistence of vision and lens imaging principle according to claim 1, is characterized in that, comprise the following steps:
1) regulate testee (1), convex lens (2), timer (3) in the position of base (4), make timer (3) testee (1) upper formed clearly as;
2) as testee (1) rotating speed < 0.5r/s, testee (1) arranges n symmetrical groove pad pasting (6), n=2 ~ 6, make testee (1) rotate, and utilize timer (3) to record and are respectively t through the time of symmetrical grooves pad pasting (6)
1, t
2, pass through formula
calculate testee (1) at this
rotating speed in circle;
As testee (1) rotating speed 0.5r/s ~ 24r/s, testee (1) arranges 1 groove pad pasting (6), the timing number of turns is respectively the 1st circle, the 2nd circle, the 3rd circle, the 4th circle, the 5th circle, the 6th circle; 1st circle time showing is t
1, the 2nd circle time showing is t
2, the 3rd circle time showing is t
3, the 4th circle time showing is t
4, the 5th circle time showing is t
5, the 6th circle time showing is t
6, pass through formula
calculate the rotating speed of testee (1);
As testee (1) rotating speed > 24r/s, carry out timing by photoelectricity door (8) and light barrier (7) to testee (1), the timing number of turns is respectively the 1st circle, (n+1)th circle, 2n+1 encloses, and 3n+1 encloses, 4n+1 encloses, and 5n+1 encloses, and the 1st circle time showing is t
1, the (n+1)th circle time showing is t
2, it is t that 2n+1 encloses time showing
3, it is t that 3n+1 encloses time showing
4, it is t that 4n+1 encloses time showing
5, it is t that 5n+1 encloses time showing
6, pass through formula
calculate the rotating speed of testee (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510656213.4A CN105242059B (en) | 2015-10-12 | 2015-10-12 | Utilize the persistence of vision and the tachometric survey instrument and measuring method of lens imaging principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510656213.4A CN105242059B (en) | 2015-10-12 | 2015-10-12 | Utilize the persistence of vision and the tachometric survey instrument and measuring method of lens imaging principle |
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| Publication Number | Publication Date |
|---|---|
| CN105242059A true CN105242059A (en) | 2016-01-13 |
| CN105242059B CN105242059B (en) | 2018-06-26 |
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