+关注 私聊

  • delingha

    第31楼2013/02/25

    药典的要求看来确实不高，但这应该就是一个最低要求吧？想请教根据实际使用经验，信噪比控制在什么样会较好呢？

    picard(yuan314159) 发表:比较的话，可以按药典要求，当然药典的要求是相当宽松的。

    Table 1.Recommended Near-IR Instrument Specificationsa

    Wavelength UncertaintySRM1920a peaksboccur at 1261,1681,and 1935nm
    Tolerances±1nm at 1200nmor ±8cm-1at 8300cm-1
    ±1nm at 1600nmor ±4cm-1at 6250cm-1
    ±1.5nm at 2000nmor ±4cm-1at 5000cm-1
    Photometric LinearityAOBSvs AREFat 1200,1600,and 2000nm;c
    slope =1.0±0.05;intercept =0.0±0.05
    Spectrophotometric Noisemeasured for 100-nm (300cm-1)segments between 1200and 2200nm (8300and 4500cm-1)
    Average RMSfor measurements
    at high-light flux    		less than 0.3×10-3;no RMSnoise greater than 0.8×10-3
    Average RMSfor measurements
    at low-light flux    		less than 1×10-3;no RMSnoise greater than 2.0×10-3

    a Amaximum nominal instrument bandwidth of 10nm at 2500nm or 16cm-1at 4000cm-1is appropriate for most applications.

    b The nominal 1935-nm peak is sensitive to instrument bandwidth.Use the wavelength value supplied with SRM1920a at the appropriate instrument bandwidth to determine wavelength uncertainty.

    c AOBSis the observed absorbance,and AREFis the tabulated absorbance of the reference reflectors at each of the three specified wavelengths.


0
    +关注 私聊

  • 仅我一个人渐渐颓废

    第32楼2013/07/05

    要是做食品检测的话我个人建议用qc-leader这款仪器 因为我们现在用的就是这款仪器 做起来还挺方便的 而且会提供出期模型 后期支持也挺不错的

0
    +关注 私聊

  • 又黑又瘦

    第33楼2013/07/09

    我单位用的是中安信达QC Leader（ip54）一致性和重现性都还不错，而且感觉挺耐用的，有次不小心一杯咖啡洒了，溅到机器上好多，我以为会出什么状况，结果什么也没发生。

0