When a pattern of closely spaced non-intersecting lines (with transparent gaps in between) is overlaid on apiece of woven fabric, characteristic moiré fringes may be observed. Design anoverlay that allows you to measure the thread count of the fabric. Determinethe accuracy for simple fabrics (e.g. linen) and investigate if the method is reliablefor more complex fabrics (e.g. denim or Oxford cloth).
當緊密排列的非相交線條(其間有透明間隙)組成的圖案覆蓋在一塊機織物上時,可以觀察到獨特的莫爾條紋。設計一種使你能夠測量織物經緯密度的覆蓋物。確定測量簡單織物(例如亞麻布)的精確度,並探究此方法能否適用於更複雜的織物(例如牛仔布或牛津布)。
In mathematics, physics, and art, a moiré pattern (/mwɑːrˈeɪ/; French: [mwaʁe]) or moiré fringes are large-scale interference patterns that can be produced when an opaque ruled pattern with transparent gaps is overlaid on another similar pattern. For the moiré interference pattern to appear, the two patterns must not be completely identical, but rather e.g. displaced, rotated or have slightly different pitch.
Moiré patterns appear in many different situations. In printing, the printed pattern of dots can interfere with the image. In television and digital photography, a pattern on an object being photographed can interfere with the shape of the light sensors to generate unwanted artifacts. They are also sometimes created deliberately – in micrometers they are used to amplify the effects of very small movements.
In physics, its manifestation is the beat phenomenon that occurs in many wave interference conditions.
——Wikipedia
旋轉5度形成的莫爾圖案
在數學、物理和藝術領域,莫爾圖案或莫爾條紋指有透明縫隙的不透明規則圖案與另一個類似圖案重疊時可產生的大範圍的幹涉圖案。要出現莫爾幹涉圖案,這兩種圖案不能完全相同,而要例如移位、旋轉或有略微不同的節距。
莫爾圖案出現在許多不同的場景中。列印時,點的列印圖案可能會干擾圖像。電視或數字攝影中,被拍攝物體的圖案可能與光傳感器形狀產生幹涉形成無用的偽像。它們有時候也被刻意生成——在微米範圍它們可用來放大非常微小的運動效果。
在物理學中,它可表現為許多波的幹涉下產生的拍頻現象。
Moire ribbons
莫爾一詞來自法語的「Moiré」 /mwɑːrˈeɪ/,不讀「摩爾」,中文近似是「摩瑞」,原來含義是波動的,或起波紋的。在古代,人們發現當兩塊薄的絲綢織物疊在一起時,可以看到一種不規則的花紋。後來人們將兩組條紋疊加在一起所產生的圖形稱為「莫爾條紋」。現在莫爾條紋廣泛用於科學研究和工程技術之中,作為精密計量手段可用於測角、測長、測振等領域。
你有想到怎樣用它來測織物精度嗎?
還是來個視頻更清楚地觀察現象吧。
沒錯,用一張白紙做背景,加兩塊紗窗,你就能看到莫爾條紋了!
莫爾條紋還能被應用來做動畫哦!趕緊來看這一神奇的幹涉。
波浪
我也很絕望啊
向前跑
你說怎麼跑就怎麼跑吧
你想怎樣用它來測試織物精度呢?歡迎留言!
When the moon hits your eye like a big pizza pie THAT'S a moiré.
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