頻閃儀的主要用途是讓運(yùn)動(dòng)的物體停止運(yùn)動(dòng)以進(jìn)行診斷檢查昔善。 但是元潘,頻閃儀也可用于測量轉(zhuǎn)速。 為此君仆,需要考慮幾個(gè)因素翩概。 首先牲距,360°旋轉(zhuǎn)(例如,軸的末端)都應(yīng)該可見被測物體钥庇。 其次牍鞠,對(duì)象上應(yīng)該有一些獨(dú)特的部分,例如螺栓评姨,鍵槽或瑕疵难述,可以用作參考點(diǎn)。 如果正在查看的對(duì)象是完全對(duì)稱的吐句,則用戶只需在單個(gè)位置用膠帶或油漆標(biāo)記該對(duì)象即可用作參考點(diǎn)胁后。
The primary use for a stroboscope is to stop motion for diagnostic inspection purposes. However, the stroboscope can be used to measure speed. In order to do this, several factors need to be considered. First, the object being measured should be visible for all 360° of rotation (e.g. The end of a shaft). Second, the object should have some unique part on it, like a bolt, keyway or imperfection to use as a reference point. If the object being viewed is perfectly symmetrical, then the user needs to mark the object with a piece of tape or paint in a single location only, to be used as a reference point.
如果旋轉(zhuǎn)速度在便攜式頻閃儀的范圍內(nèi),請從zui高閃光率開始嗦枢,然后將閃光率調(diào)低攀芯。 在某些時(shí)候,您將只在物體的單個(gè)圖像上停止運(yùn)動(dòng)净宵。 請注意敲才,以兩倍于圖像實(shí)際速度的閃光速率裹纳,您將看到兩幅圖像择葡。 當(dāng)接近正確的速度時(shí),您可能會(huì)看到三幅剃氧,四幅或更多幅實(shí)際速度諧波的圖像敏储。 您看到的個(gè)SINGLE圖像是真實(shí)速度。 要確認(rèn)真實(shí)速度朋鞍,請記下讀數(shù)并將頻閃儀(http://www.0851zc.com/pinshanyi/)調(diào)整為該讀數(shù)的一半已添,或僅按÷2按鈕。 您應(yīng)該再次看到一個(gè)圖像(可能相對(duì)于所看到的個(gè)圖像有相移)滥酥。
If the speed of rotation is within the range of the stroboscope, start at the highest flash rate and adjust the flash rate down. At some point you will stop the motion with only a single image of the object in view. Note that at a flash rate twice the actual speed of the image you will see two images. As you approach the correct speed, you may see three, four or more images at harmonics of the actual speed. The first SINGLE image you see is the true speed. To confirm the true speed, note the reading and adjust the stroboscope to exactly half this reading, or just press the ÷2 button. You should again see a single image (which may be phase shifted with respect to the first image seen).
例如更舞,當(dāng)查看具有單個(gè)鍵槽的軸時(shí),您將以實(shí)際速度以及實(shí)際速度的1 / 2坎吻、1 / 3缆蝉、1 / 4等看到鍵槽的一個(gè)靜止圖像。 您將看到2倍于實(shí)際速度的鍵槽圖像瘦真,3倍于3倍速度的鍵槽刊头,依此類推。FPM等于zui高閃光速率下的軸每分鐘轉(zhuǎn)數(shù)(RPM)诸尽,僅給出鍵槽的一張固定圖像原杂。
For example, when viewing a shaft with a single keyway, you will see one stationary image of the keyway at the actual speed and at 1/2, 1/3, ?, etc. of the actual speed. You will see 2 images of the key way at 2 times the actual speed, 3 key way at 3 times, etc. The FPM equals the shafts Revolutions Per Minute (RPM) at the highest flash rate that gives only one stationary image of the keyway.
如果您可以關(guān)閉設(shè)備并安裝一條反光帶,則可以輕松使用光學(xué)轉(zhuǎn)速計(jì)進(jìn)行RPM測量您机。 當(dāng)您無法關(guān)閉設(shè)備時(shí)穿肄,必須使用便攜式頻閃儀年局。 當(dāng)閃光速率低于300 FPM時(shí),人眼不容易被頻閃儀誘騙看到停止的圖像咸产。 因此某宪,頻閃儀幾乎不可能在300 FPM以下用于檢查或測量RPM,此時(shí)上海峰志儀器有限公司工程師建議采用接觸式轉(zhuǎn)速表或光電轉(zhuǎn)速表進(jìn)行轉(zhuǎn)速測量锐朴。
In instances when you can shut down the device and install a piece of reflective tape then an optical tachometer is easy to use for RPM measurement. Stroboscopes must be used when you can’t shut down the device. The human eye is not easily tricked into seeing a stopped image by a stroboscope when the flash rate is slower than 300 FPM. Therefore, stroboscopes are just about impossible to use below 300 FPM for inspection or to measure RPM.
轉(zhuǎn)速表和頻閃儀的測量單位:
FPM=flashes per minute
FPM:每分鐘頻閃的次數(shù)
RPM=Revolutions per minute
RPM:每分鐘轉(zhuǎn)速
上圖:用福祿克頻閃儀測量設(shè)備轉(zhuǎn)速
頻閃儀
頻閃儀是每隔一定時(shí)間發(fā)出一次閃光兴喂,利用人眼睛的視覺暫留,使動(dòng)態(tài)的物體靜止化焚志,用頻閃儀可測量風(fēng)扇的轉(zhuǎn)速衣迷,水滴的流速,弦的振動(dòng)頻率和觀測一維駐波的特性等,從中可揭示一些運(yùn)動(dòng)物體的形成,規(guī)律,特點(diǎn)和內(nèi)在的物理含義酱酬。在觀測高速旋轉(zhuǎn)的物體時(shí)壶谒,通過調(diào)節(jié)頻閃儀的閃動(dòng)頻率,使其與被測物體的轉(zhuǎn)動(dòng)或運(yùn)動(dòng)物體的速度接近或同步時(shí)膳沽,被測物體雖然在高速運(yùn)動(dòng)著汗菜,但看上去卻是緩慢運(yùn)動(dòng)或靜止的。這種視覺暫留現(xiàn)象挑社,使人目測就能輕易觀測高速運(yùn)動(dòng)物體的運(yùn)行狀況陨界。
頻閃石英閃光管的工作原理
頻閃儀的燈管又叫頻閃石英氙氣燈管是采用特種硬質(zhì)玻璃管或者石英玻璃管,在玻璃兩端用高溫把經(jīng)特殊工藝處理的點(diǎn)擊封裝成形痛阻,頻閃儀燈管充入高純度的特種氣體(如氙氣)菌瘪,在燈管外部繞上金屬絲,或涂上特種開發(fā)薄膜而制成的氣體放電燈阱当。
頻閃燈管的工作俏扩,需要一套幾倍的電路組件配套,才能發(fā)光工作弊添。電路各部分功能和工作如下:
1.電容C3是頻閃儀燈管放電發(fā)光作儲(chǔ)存電量录淡,它由直流電源V提供電源
2.電容器Ct是儲(chǔ)存觸發(fā)能量,經(jīng)電阻R1和R2組成的分壓器油坝,產(chǎn)生的分壓Vt嫉戚,向電容Ct充電。該Vt值便是觸發(fā)線圈的初級(jí)輸入電壓值免钻。
3.觸發(fā)線圈T2的初級(jí)線組連接著控制開關(guān)S彼水,并與電容器Ct組成回路,而觸發(fā)線間的次級(jí)線圈組极舔,則和閃光管的觸發(fā)線相連接凤覆。
4.當(dāng)開關(guān)S閉合,Ct所儲(chǔ)存的電量向觸發(fā)線圈初級(jí)釋放拆魏。于是初級(jí)就有數(shù)千伏以上的高壓脈沖感應(yīng)輸出盯桦,作用到頻閃儀燈泡觸發(fā)極上去慈俯。
5.該高壓脈沖使頻閃儀燈泡內(nèi)氙氣電離,并與燈泡內(nèi)電極形成電離導(dǎo)通拥峦。
6.電離導(dǎo)通使燈泡內(nèi)內(nèi)阻驟降贴膘,導(dǎo)致儲(chǔ)能電容器Cs向燈泡內(nèi)放電。
7.電容器Cs的強(qiáng)電量使管內(nèi)成雪崩式電離略号,形成電弧放電狀態(tài)刑峡,產(chǎn)生強(qiáng)烈光輸出。放電使Cs電壓驟降玄柠。降至一定程度后突梦,不能維持雪崩式電離,于是電脈放電狀態(tài)停止羽利,燈泡熄滅宫患。