CN203037447U - Automatic focal length measurement device for thin convex lens - Google Patents
Automatic focal length measurement device for thin convex lens Download PDFInfo
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- CN203037447U CN203037447U CN 201320002607 CN201320002607U CN203037447U CN 203037447 U CN203037447 U CN 203037447U CN 201320002607 CN201320002607 CN 201320002607 CN 201320002607 U CN201320002607 U CN 201320002607U CN 203037447 U CN203037447 U CN 203037447U
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- 238000005259 measurement Methods 0.000 title claims abstract description 19
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 5
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- 230000023077 detection of light stimulus Effects 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000002459 sustained effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract 1
- 238000003384 imaging method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
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Abstract
The utility model discloses an automatic focal length measurement device for a thin convex 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 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 convex 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 convex lens can be effectively improved. The automatic focal length measurement device for the thin convex 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 focal length of convex lens 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 convex lens mainly adopts first three methods.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, be because the light that marginal point in kind sends does not converge on the picture screen causes, when clear picture, illumination intensity was for maximum when namely light converged at the picture screen and goes up.Can carry out the measurement of thin focal length of convex lens according to above-mentioned optical principle.
Particularly, when the distance of shielding picture screen when thing is definite value L, according to protruding thin lens imaging formula (1):
Wherein u is object distance, and v is image distance, obtains measuring the formula (2) of focal length of convex lens:
Based on L value and thing shield convex lens to be measured apart from s, just can utilize above-mentioned formula (2) to calculate the focal distance f of convex lens to be measured.But, still do not utilize above-mentioned technology to realize the measurement mechanism of thin focal length of convex lens so far.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of thin focal length of convex lens self-operated measuring unit, the measuring accuracy of utilizing the optical principle introduced in the background technology and relevant art to improve thin focal length of convex lens effectively.
According to an aspect of the present utility model, a kind of thin focal length of convex lens 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 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, the processing of all input data of its responsible described device and the output of all control signals, and wherein, described cpu controller is embodied as the main control board in the described device;
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 these convex lens, 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 focal length of convex lens measuring process can not be subjected to the influence of extraneous light;
Described convex lens draw-in groove is an adjustable semicircle draw-in groove, and it is fixed on the described drive link by the draw-in groove support;
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;
The movement of the described drive link of described direct motor drive;
Described drive link is threaded, and drives described convex lens draw-in groove fixed thereon and move 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 convex lens to be measured, 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 convex lens to be measured;
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 main control board further comprises: reset circuit, crystal oscillating circuit, power circuit, ultrasonic ranging sensor signal conditioning circuit, light intensity sensor signal conditioning circuit, liquid crystal display drive circuit, motor drive circuit, unit state indicator light circuit, serial ports are downloaded debug circuit and CPU, wherein, described CPU adopts the STC89C54 family chip to realize.
Preferably, described power circuit adopts alternating current-direct current rectification circuit and voltage stabilizing chip to constitute.
Preferably, described ultrasonic ranging sensor signal conditioning circuit is used for the signal interference-free transmission between assurance and the described ultrasonic ranging sensor.
Preferably, described light intensity sensor signal conditioning circuit is used for the signal interference-free transmission between assurance and the described light intensity sensor.
Preferably, described liquid crystal display drive circuit is in order to increase described CPU to the driving force of described LCDs.
Preferably, described motor drive circuit is in order to increase described CPU to the driving force of described motor.
Preferably, described unit state indicator light circuit is indicated the running status of power supply, various sensor, motor in order to support described status indicator lamp.
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 focal length of convex lens 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 focal length of convex lens self-operated measuring unit.
Description of drawings
Fig. 1 is the synoptic diagram in kind of thin focal length of convex lens self-operated measuring unit in the utility model embodiment;
Fig. 2 is the functional structure chart of thin focal length of convex lens self-operated measuring unit in the utility model embodiment;
Fig. 3 is the circuit module figure of the main control board of thin focal length of convex lens self-operated measuring unit in the utility model embodiment.
Embodiment
Fig. 1 is the synoptic diagram in kind of thin focal length of convex lens self-operated measuring unit in the utility model embodiment.As shown in Figure 1, the thin focal length of convex lens 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 draw-in groove 5, light intensity sensor 6, black picture screen 7, drive link 8, motor 9, LCDs 10, cpu controller 11, starting switch 12, ultrasonic ranging sensor 13, operation base and support 14, crust of the device 15 and status indicator lamp 16 etc.
Fig. 2 is the functional structure chart of thin focal length of convex lens 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 focal length of convex lens self-operated measuring unit in Fig. 1, the 2 pairs of embodiments.
What deserves to be explained is that cpu controller 11 is to be used for carrying out the parts that thin focal length of convex lens calculates 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 focal length of convex lens 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.
Fig. 3 is the circuit module figure of the main control board (cpu controller) of thin focal length of convex lens self-operated measuring unit in the utility model embodiment.Wherein, Reference numeral 101 is reset circuits; The 102nd, crystal oscillating circuit; The 103rd, power circuit, it adopts alternating current-direct current rectification circuit and voltage stabilizing chip to constitute; The 104th, ultrasonic ranging sensor signal conditioning circuit, signal interference-free transmission between assurance and the ultrasonic ranging sensor; The 105th, light intensity sensor signal conditioning circuit, signal interference-free transmission between assurance and the light intensity sensor; The 106th, liquid crystal display drive circuit is to increase the driving force of the LCDs of CPU; The 107th, motor drive circuit is to increase the driving force of the motor of CPU; The 108th, the unit state indicator light circuit is indicated the running status of power supply, various sensor, motor etc. with the status of support pilot lamp; The 109th, serial ports is downloaded debug circuit; The 110th, CPU, it can adopt the STC89C54 family chip to realize.
Thin focal length of convex lens method for automatic measurement in the embodiment comprises the steps:
Step 1: convex lens to be measured are clipped on the convex lens draw-in groove.
Step 2: after convex 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, convex lens draw-in groove on the motor drives drive link moves simultaneously, when light intensity sensor detects the light intensity maximum, brake motor moves to stop the convex lens draw-in groove, and start the ultrasonic ranging sensor instrument distance, thereby obtain black thing with holes shield convex lens to be measured apart from s.
Step 5:CPU controller calculates the focal length of convex lens to be measured according to the optical principle of introducing in the background technology and formula.
Particularly, because led light source, light source filter, the black of the utility model device thing screen with holes and black picture screen etc. all are in a fixed position, so the distance that black thing with holes shields black picture screen is certain value L.According to protruding thin lens imaging formula (1):
Wherein u is object distance, and v is image distance, obtains the formula (2) of the employed measurement focal length of convex lens of the utility model device:
Based on resulting apart from s in L value and the step 4, utilize above-mentioned formula (2) can calculate the focal distance f of convex 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 6, and cpu controller shows the focal length of convex lens that calculates in LCDs.
According to above-mentioned embodiment introduction as can be known, the utility model is accurately judged the readability of imaging by the detection of light intensity, thereby has improved the measuring accuracy of thin focal length of convex lens 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 focal length of convex lens self-operated measuring unit.
Claims (3)
1. thin focal length of convex lens 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 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, the processing of all input data of its responsible described device and the output of all control signals, and wherein, described cpu controller is embodied as the main control board in the described device;
Described led light source is used to described device that light source is provided;
Described light source filter is convex lens, and described led light source is arranged on the focal plane of these convex lens, 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 focal length of convex lens measuring process can not be subjected to the influence of extraneous light;
Described convex lens draw-in groove is an adjustable semicircle draw-in groove, and it is fixed on the described drive link by the draw-in groove support;
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;
The movement of the described drive link of described direct motor drive;
Described drive link is threaded, and drives described convex lens draw-in groove fixed thereon and move 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 convex lens to be measured, 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 convex lens to be measured;
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, it is characterized in that, described main control board further comprises: reset circuit, crystal oscillating circuit, power circuit, ultrasonic ranging sensor signal conditioning circuit, light intensity sensor signal conditioning circuit, liquid crystal display drive circuit, motor drive circuit, unit state indicator light circuit, serial ports are downloaded debug circuit and CPU, wherein, described CPU adopts the STC89C54 family chip to realize.
3. device according to claim 2 is characterized in that, described power circuit adopts alternating current-direct current rectification circuit and voltage stabilizing chip to constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002607 CN203037447U (en) | 2013-01-05 | 2013-01-05 | Automatic focal length measurement device for thin convex lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002607 CN203037447U (en) | 2013-01-05 | 2013-01-05 | Automatic focal length measurement device for thin convex lens |
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| Publication Number | Publication Date |
|---|---|
| CN203037447U true CN203037447U (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320002607 Expired - Lifetime CN203037447U (en) | 2013-01-05 | 2013-01-05 | Automatic focal length measurement device for thin convex lens |
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| CN (1) | CN203037447U (en) |
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2013
- 2013-01-05 CN CN 201320002607 patent/CN203037447U/en not_active Expired - Lifetime
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Granted publication date: 20130703 |
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| CX01 | Expiry of patent term |