濕度傳感器系統(tǒng)畢業(yè)論文中英文資料外文翻譯-其他專業(yè)-wenkub.com
2025-01-15 03:42 本頁(yè)面
【正文】 圖 4 顯示推薦的傳感器殼體與過(guò)濾帽 SF1 之間的裝配關(guān)系。那樣會(huì)導(dǎo)致被測(cè)溫度比實(shí)際溫度高，而濕度則降低的結(jié)果 。 ? 殼體設(shè)計(jì) (參考公式 1)應(yīng)考慮： ● 傳感器周圍空氣流通口的尺寸要盡可能地大，或者直接將傳感器置于殼外 → 對(duì)流性最好封入套管內(nèi)時(shí)傳 感器周圍的 “死區(qū) ”要盡可能地小， → 傳導(dǎo)性最小 。為了防止附加的測(cè)量誤差，傳感器不要安裝在發(fā)熱的電子元器件附近。 ? 傳導(dǎo)：這是個(gè)很慢的由水分子的分子熱運(yùn)動(dòng)決定的過(guò)程，它出現(xiàn)在 “靜止的 ”空氣中（例如在殼體內(nèi)部），使 響應(yīng)時(shí)間變長(zhǎng)。但是，要到達(dá)距其還有 3%RH 6%RH的終端測(cè)量值還需要很長(zhǎng)的時(shí)間。實(shí)際的校準(zhǔn)工作通常用以下兩種方法（參見(jiàn)圖 2）： 1. 以 t2 時(shí)間對(duì)應(yīng)的測(cè)量值作為校驗(yàn)參考基準(zhǔn)； 優(yōu)點(diǎn) ： ? 到達(dá)終端值（例如 100%RH）所需要的測(cè)量時(shí)間明顯地縮短了，對(duì)應(yīng)于實(shí)際上的快速響應(yīng)傳感器。相比之下時(shí)間段 2 是很長(zhǎng)很長(zhǎng)的，（數(shù)小時(shí)至數(shù)天），測(cè)量精度與響應(yīng)特性的關(guān)系在這張圖上看得更清晰了（ t 延續(xù)到濕度達(dá)到 100%RH 時(shí)為止）。 2 和 4 主要取決于整個(gè)系統(tǒng)的結(jié)構(gòu)設(shè)計(jì)。 4. 與傳感器相關(guān)的系統(tǒng)熱質(zhì)量。（濕度是溫度的函數(shù)，濕度會(huì) 隨著溫度升高而降低，傳感器與被測(cè)環(huán)境之間的溫差會(huì)導(dǎo)致濕度測(cè)量誤差）更詳細(xì)的說(shuō)明請(qǐng)見(jiàn)下一節(jié)。測(cè)量精度和響應(yīng)時(shí)間是如此地接近并且相互依賴，使?jié)穸葴y(cè)量系統(tǒng)的結(jié)構(gòu)設(shè)計(jì)成為一項(xiàng)挑戰(zhàn)。 little diffusion! ? The sensor should be decoupled thermally as much as possible from other ponents, so that the response characteristics of the sensor are not negatively affected by the thermal inertia of the entire system.(., its own printed circuit board for the humidity sensor, structurally partitioning the housing to create a small volume for the humidity sensor, see Fig. 3) Fig. 3: Mounting example for Sensirion sensors SHT11 and SHT15 with slits for thermal decoupling ? The sensor should not be mounted in the vicinity of heat sources. If it was, measured 6 temperature would increase and measured humidity decrease. 5 Design proposal The challenge is to realize a system that operates cleanly by optimally taking into account all of the points in section 4. The already calibrated SMD humidity sensors SHT11 and SHT15 from Sensirion are the ideal solution. For optimum integration of the sensors in a measurement system, Sensirion AG has also developed a filter cap as an adapter aid, which takes into account as much as possible the points in section 4 and also protects the sensor against contaminants with a filter membrane. Fig. 4 shows schematically how the sensors can be ideally integrated into a housing wall by means of the filter cap SF1. Fig. 4: Filter cap for SHT11 and SHT15 In addition to the advantages mentioned above, there is also the option of building an IP67patible humidity measurement device (with Oring, cf. Fig. 4) with optimal performance. Detailed information is available on the Sensirion Web site. 7 譯文： 相 對(duì) 濕 度 傳 感 器 系 統(tǒng) 的 正 確 設(shè) 計(jì) 濕度傳感器系統(tǒng)精度及響應(yīng)特性的優(yōu)化 1. 綜述 為了在相對(duì)濕度的應(yīng)用方面對(duì)傳感器做出正確的選擇，了解和評(píng)估那些起決定作用的因素是非常重要的。 a difference between sensor and ambient temperature leads to measurement errors). This response time thus has a significant effect on the value measured by the sensor and thus on the determ
環(huán)評(píng)公示相關(guān)推薦
鄂ICP備17016276號(hào)-1