कला
सुन्दरता र कल्याण
हस्तकला
संस्कृति र इतिहास
मनोरञ्जन
वातावरण
खाना र पेय
रिभर्स इन्जिनियरिङ
विज्ञान
खेलकुद
प्रविधि
पहिर्न मिल्ने
Anti-Reflection Coating
Katharine Blodgett at General Electric, working with Irving Langmuir, learned to build soap-like films one molecule-thick layer at a time. Stacking just enough layers onto glass, she made it nearly invisible: light reflected from the top of the film and from the glass beneath cancelled out.
**US 2,220,861**, "Reduction of surface reflection", Blodgett, assigned to General Electric, filed 16. June 1938, granted 5. November 1940: a coating whose "optical thickness … corresponds at least approximately to a quarter wave length of visible light" and whose refractive index is "intermediate" between air and the glass.
**You measure the reflection a coating removes**, design one in a notebook, and watch quarter-wave interference happen in a soap film.
शुरुआती
90 minutes
निर्देशनहरू
1
1
Measure bare glass
Measure bare glass
Clip the solar cell to the multimeter (DC mA). In a dim room shine the laser straight onto the cell and note the current. Then bounce the beam off a clean microscope slide, close to perpendicular, onto the cell. Note that current. Never look along the beam.
यस चरणका सामग्री:
सूक्ष्मदर्शीका स्लाइड र ढकनी1 प्याक
Solar Cell Mini - 350mV1 टुक्राचाहिने औजार:
लेजर सूचक
मल्टिमिटर
Alligator to Alligator Cables2
2
Mix a film solution
Mix a film solution
Stir 1 part detergent and 1 part glycerin into 10 parts water in a jar. Bend copper wire into a 60 mm loop with a handle.
यस चरणका सामग्री:
हलुका सर्फ20 मिलि
ग्लिसरिन (वनस्पतिजन्य)20 मिलि
तामाको तार1 मिटरचाहिने औजार:
सिसाको भाँडो
प्लासको सेट3
3
Watch a film thin
Watch a film thin
Dip the loop and hold it upright in front of black card, lit by a window behind you. Colour bands slide down as the film drains; at the top a black band appears - a film too thin to reflect.
यस चरणका सामग्री:
कालो बाक्लो कागज1 पाना4
4
Fresnel, coating design, soap film
Fresnel, coating design, soap film
Jupyter नोटबुक लोड हुँदैछ…
5
5
History & Context
History & Context
**What the patent specifies:** a surface layer of quarter-wave optical thickness with a refractive index between those of the surrounding medium and the glass. **Modern build (derived):** measurement and design only - production coatings are evaporated in vacuum.
Blodgett's stearate films were too soft to wipe clean. Alexander Smakula at Zeiss had developed coatings evaporated in vacuum in 1935; that durable route won, and today almost every camera lens and eyeglass is coated, often with many layers. Their limits: a single layer is perfect at only one wavelength, and coatings scratch.
सामग्री
6- 1 प्याकप्लेसहोल्डर
- Solar Cell Mini - 350mV10% कमिसन1 टुक्रा$2.22
- 20 मिलिप्लेसहोल्डर
- 20 मिलिप्लेसहोल्डर
- 1 मिटरप्लेसहोल्डर
- 1 पानाप्लेसहोल्डर
आवश्यक उपकरणहरू
5- प्लेसहोल्डर
- प्लेसहोल्डर
- Alligator to Alligator Cables10% कमिसन$3.58
- प्लेसहोल्डर
- प्लेसहोल्डर
अनुमानित जम्मा
बनाउनेले किनेको कुरा। मूल्य नदेखिएका सामग्री तपाईंले जहाँबाट किन्नुहुन्छ त्यहीँबाट पाइन्छ।
सम्बन्धित ब्लुप्रिन्ट
यी ब्लुप्रिन्टहरूले ज्ञान साझा गर्छन् — प्रविधि, सामग्री वा सिद्धान्त
CC0 सार्वजनिक डोमेन
यो ब्लुप्रिन्ट CC0 अन्तर्गत जारी गरिएको छ। तपाईं अनुमति नसोधी प्रतिलिपि, परिमार्जन, वितरण र प्रयोग गर्न सक्नुहुन्छ।
ब्लुप्रिन्ट मार्फत उत्पादनहरू किनेर सिर्जनाकर्तालाई सहयोग गर्नुहोस् सिर्जनाकर्ता कमिसन विक्रेताले तोकेको, वा यो ब्लुप्रिन्टको नयाँ संस्करण बनाउनुहोस् र आम्दानी बाँड्न आफ्नो ब्लुप्रिन्टमा जडानको रूपमा समावेश गर्नुहोस्।