CN203037448U - Automatic focal length measurement device for thin concave lens - Google Patents
Automatic focal length measurement device for thin concave lens Download PDFInfo
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- CN203037448U CN203037448U CN 201320004716 CN201320004716U CN203037448U CN 203037448 U CN203037448 U CN 203037448U CN 201320004716 CN201320004716 CN 201320004716 CN 201320004716 U CN201320004716 U CN 201320004716U CN 203037448 U CN203037448 U CN 203037448U
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- 238000005259 measurement Methods 0.000 title claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 13
- 230000023077 detection of light stimulus Effects 0.000 claims description 5
- 230000002459 sustained effect Effects 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 abstract 1
- 238000003384 imaging method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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Abstract
The utility model discloses an automatic focal length measurement device for a thin concave lens. The device comprises an LED light source, a light source filter, a black object screen with a hole, a slideable baffle, a convex lens, a concave lens clamping groove, a light intensity sensor, a black image screen, a transmission rod, a motor, a liquid crystal display, a CPU controller, a starting switch, an ultrasonic ranging sensor, an operation base, a support, a device shell, and a status indication lamp. According to the automatic focal length measurement device for the thin concave lens, the definition of the image can be accurately judged by the light intensity detection, and then the focal length measurement precision of the thin concave lens can be effectively improved. The automatic focal length measurement device for the thin concave lens is advanced, reasonable, effective, high in automation degree and quick and accurate in measurement.
Description
Technical field
The utility model belongs to design and the manufacturing technology field of physical experiment apparatus, relates in particular to a kind of thin Concave Mirrors Focus self-operated measuring unit.
Background technology
In Experiment of College Physics, the measurement of focal distance of thin convex lens is the most basic experiment.Measuring method commonly used has: autocollimatic method, object distance-image distance method, Conjugate method and lens combination are legal.The focal length of measuring thin concavees lens mainly adopts lens combination legal.No matter which kind of method all needs human eye to go to judge the readability of imaging, and then determines picture screen position.Because individual's visual custom is different and the restriction of aberration, therefore, be difficult to determine that accurately the precision of measurement result is generally not high as the screen position.What light source, thing screen and picture screen were chosen in addition is different, also can bring certain influence to the judgement of imaging readability.In sum, if these influence factor stacks, measurement result may occur than mistake.
Following optical principle is arranged in the prior art: if not fogging clear, particularly during edge fog, would be because the light that marginal point in kind sends does not converge on the picture screen causes.Therefore when clear picture, illumination intensity was for maximum when namely light converged at as screen upward.Can carry out the measurement of thin Concave Mirrors Focus according to above-mentioned optical principle.
Particularly, when the distance of shielding the concavees lens draw-in groove when thing is definite value a, according to recessed thin lens imaging formula (1):
Wherein, u is object distance, and v is image distance, obtains measuring the formula (2) of Concave Mirrors Focus:
Thing shields first distance b of picture screen and the second distance c that thing shields the picture screen during based on a value, clear picture, utilizes above-mentioned formula (2) can calculate the focal distance f of concavees lens to be measured.But, still do not utilize above-mentioned technology to realize the measurement mechanism of thin Concave Mirrors Focus so far.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of thin Concave Mirrors Focus self-operated measuring unit, the measuring accuracy of utilizing the optical principle introduced in the background technology and relevant art to improve thin Concave Mirrors Focus effectively.
According to an aspect of the present utility model, a kind of thin Concave Mirrors Focus self-operated measuring unit is provided, and described device comprises: led light source, light source filter, black thing screen with holes, slidably baffle plate, convex lens, concavees lens draw-in groove, light intensity sensor, black picture screen, drive link, motor, LCDs, cpu controller, starting switch, ultrasonic ranging sensor, operation base and support, crust of the device and status indicator lamp.
Preferably, described cpu controller is the central controller of described device, is responsible for the processing of all input data and the output of control signal;
Described led light source provides light source for described device;
Described light source filter is convex lens, and described led light source is arranged on the focal plane of described light source filter, to guarantee that the light that is mapped on the described black thing screen with holes is parallel rays;
Described black thing with holes screen is one to have the black panel in 1 font hole;
Described slidably baffle plate is used for making interior each optical device of described device to seal with respect to the external world, thereby makes the Concave Mirrors Focus measuring process can not be subjected to the influence of extraneous light;
Described convex lens are used for forming compound lens with concavees lens to be measured, thereby carry out the measurement of Concave Mirrors Focus;
Described concavees lens draw-in groove is half circular draw-in groove, is used for holding concavees lens to be measured;
Described light intensity sensor is attached on the described black picture screen, carrying out the detection of light intensity, and testing result is delivered to described cpu controller handle;
Described black picture screen is fixed on the described drive link, can move with described drive link;
The movement of the described drive link of described direct motor drive;
Described drive link is threaded, and it is mobile to drive described black picture screen fixed thereon under the driving of described motor;
Described ultrasonic ranging sensor is fixed on the lower end of described black thing with holes screen, measuring the distance between described black thing screen with holes and the described black picture screen, and measurement result is delivered to described cpu controller handle;
Described operation base and support are supported each optical device of described device, and guarantee that the photocentre of each optical device all is in sustained height;
Described LCDs numeral shows the focal length of the concavees lens of surveying;
Described status indicator lamp is indicated the running status of each controllable component in the described device;
Described starting switch is used for connecting the power supply of described device to start described device; And
Described crust of the device provides mechanical protection for the optical device in the described device and miscellaneous part.
Preferably, described cpu controller is embodied as the main control board in the described device.
According to technique scheme, the utility model is accurately judged the readability of imaging by the detection of light intensity, thereby has improved the measuring accuracy of thin Concave Mirrors Focus effectively.Device of the present utility model is rationally advanced, and the automaticity height is measured quick and precisely, is a kind of effective thin Concave Mirrors Focus self-operated measuring unit.
Description of drawings
Fig. 1 is the synoptic diagram in kind of thin Concave Mirrors Focus self-operated measuring unit in the utility model embodiment;
Fig. 2 is the functional structure chart of thin Concave Mirrors Focus self-operated measuring unit in the utility model embodiment.
Embodiment
Fig. 1 is the synoptic diagram in kind of thin Concave Mirrors Focus self-operated measuring unit in the utility model embodiment.As shown in Figure 1, the thin Concave Mirrors Focus self-operated measuring unit in the utility model embodiment comprises: led light source 1, light source filter 2, black thing screen 3 with holes, slidably baffle plate 4, convex lens 5, concavees lens draw-in groove 6, light intensity sensor 7, black picture screen 8, drive link 9, motor 10, LCDs 11, cpu controller 12, starting switch 13, ultrasonic ranging sensor 14, operation base and support 15, crust of the device 16 and status indicator lamp 17 etc.
Fig. 2 is the functional structure chart of thin Concave Mirrors Focus self-operated measuring unit in the utility model embodiment.Band arrow dotted line among the figure between each parts represents that light injects the path, and band arrow solid line is represented the transmission path of control signal or data-signal, does not represent that with the solid line of arrow certain annexation is arranged between parts physically.
Below just do further introduction in conjunction with the vitals of thin Concave Mirrors Focus self-operated measuring unit in Fig. 1, the 2 pairs of embodiments.
What deserves to be explained is that cpu controller 12 is to be used for carrying out the parts that thin Concave Mirrors Focus is calculated in the utility model.Be the prior art that background technology is introduced owing to be used for optical principle and the computing formula of the thin Concave Mirrors Focus of calculating in the utility model, this cpu controller only is to utilize known hardware device to realize this known computing formula, these computing method itself are not inventive point of the present utility model, and inventive point of the present utility model is structure and the hardware annexation of measurement mechanism.
Thin Concave Mirrors Focus method for automatic measurement in the embodiment comprises the steps:
Step 1: concavees lens to be measured are clipped on the concavees lens draw-in groove.
Step 2: after concavees lens to be measured folder is steady, slide slidably that baffle plate makes each optical device seal with respect to the external world, thereby make measuring process not influenced by extraneous light.
Step 3:CPU controller triggers led light source work, and the led light source emitted light becomes parallel rays behind the light source filter, and 1 font hole on black thing screen with holes evenly is mapped on the convex lens to be measured again, and imaging on black picture screen.
Step 4: light intensity sensor detects the intensity of illumination that black picture screen receives, black picture screen on the motor drives drive link is mobile simultaneously, when light intensity sensor detects the light intensity maximum for the first time, the real image (being equivalent to a virtual object for concavees lens to be measured) that to be light form through convex lens black look like to shield into clearly as the time, brake motor is mobile to stop black picture screen, and start the ultrasonic ranging sensor instrument distance, thereby obtain first distance b that black thing with holes shields black picture screen.
Step 5: the black picture screen on the motor drives drive link continues to move right, when light intensity sensor detects the light intensity maximum for the second time, it is mobile that brake motor stops black picture screen again, and start the sound ranging sensor instrument distance again, thereby obtain black thing with holes shield black picture screen second distance c.
Step 6:CPU controller calculates the focal length of concavees lens to be measured.
Particularly, because operation base and the support of the utility model device guarantee that each optical device photocentre is in sustained height, and led light source, light source filter, black thing screen with holes, convex lens and concavees lens draw-in groove all be in a fixed position, so the distance that black thing with holes shields the concavees lens draw-in groove is certain value a.According to recessed thin lens imaging formula (1):
Wherein, u is object distance, and v is image distance, obtains the formula (2) of the employed measurement Concave Mirrors Focus of the utility model device:
Based on a value, in step 4 resulting first distance b and in step 5 resulting second distance c, utilize above-mentioned formula (2) can calculate the focal distance f of concavees lens to be measured.
What deserves to be explained is, because this optical principle and computing formula are prior art, this cpu controller only is to utilize known hardware device to realize having computing formula now, these computing method itself are not inventive point of the present utility model, and inventive point of the present utility model is structure and the hardware annexation of measurement mechanism.
Preferably, this method can also comprise step 7, and cpu controller shows the Concave Mirrors Focus that calculates in LCDs.
According to technique scheme, the utility model is accurately judged the readability of imaging by the detection of light intensity, thereby has improved the measuring accuracy of thin Concave Mirrors Focus effectively.Device of the present utility model is rationally advanced, and the automaticity height is measured quick and precisely, is a kind of effective thin Concave Mirrors Focus self-operated measuring unit.
Claims (2)
1. thin Concave Mirrors Focus self-operated measuring unit, it is characterized in that, described device comprises: led light source, light source filter, black thing screen with holes, slidably baffle plate, convex lens, concavees lens draw-in groove, light intensity sensor, black picture screen, drive link, motor, LCDs, cpu controller, starting switch, ultrasonic ranging sensor, operation base and support, crust of the device and status indicator lamp, wherein
Described cpu controller is the central controller of described device, is responsible for the processing of all input data and the output of control signal;
Described led light source provides light source for described device;
Described light source filter is convex lens, and described led light source is arranged on the focal plane of described light source filter, to guarantee that the light that is mapped on the described black thing screen with holes is parallel rays;
Described black thing with holes screen is one to have the black panel in 1 font hole;
Described slidably baffle plate is used for making interior each optical device of described device to seal with respect to the external world, thereby makes the Concave Mirrors Focus measuring process can not be subjected to the influence of extraneous light;
Described convex lens are used for forming compound lens with concavees lens to be measured, thereby carry out the measurement of Concave Mirrors Focus;
Described concavees lens draw-in groove is half circular draw-in groove, is used for holding concavees lens to be measured;
Described light intensity sensor is attached on the described black picture screen, carrying out the detection of light intensity, and testing result is delivered to described cpu controller handle;
Described black picture screen is fixed on the described drive link, can move with described drive link;
The movement of the described drive link of described direct motor drive;
Described drive link is threaded, and it is mobile to drive described black picture screen fixed thereon under the driving of described motor;
Described ultrasonic ranging sensor is fixed on the lower end of described black thing with holes screen, measuring the distance between described black thing screen with holes and the described black picture screen, and measurement result is delivered to described cpu controller handle;
Described operation base and support are supported each optical device of described device, and guarantee that the photocentre of each optical device all is in sustained height;
Described LCDs numeral shows the focal length of the concavees lens of surveying;
Described status indicator lamp is indicated the running status of each controllable component in the described device;
Described starting switch is used for connecting the power supply of described device to start described device; And
Described crust of the device provides mechanical protection for the optical device in the described device and miscellaneous part.
2. device according to claim 1 is characterized in that, described cpu controller is embodied as the main control board in the described device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320004716 CN203037448U (en) | 2013-01-05 | 2013-01-05 | Automatic focal length measurement device for thin concave lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320004716 CN203037448U (en) | 2013-01-05 | 2013-01-05 | Automatic focal length measurement device for thin concave lens |
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| CN203037448U true CN203037448U (en) | 2013-07-03 |
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| CN 201320004716 Expired - Lifetime CN203037448U (en) | 2013-01-05 | 2013-01-05 | Automatic focal length measurement device for thin concave lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076157A (en) * | 2013-01-05 | 2013-05-01 | 山西省电力公司大同供电分公司 | Automatic measuring device and method for focal distance of thin concave lens |
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2013
- 2013-01-05 CN CN 201320004716 patent/CN203037448U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076157A (en) * | 2013-01-05 | 2013-05-01 | 山西省电力公司大同供电分公司 | Automatic measuring device and method for focal distance of thin concave lens |
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Granted publication date: 20130703 |
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| CX01 | Expiry of patent term |