135照相胶片密度的测定

135照相胶片密度测定的设计

mV来测量密度。钢尺：30cm/0.05cm； 电子天平：200g/0.1mg；读数显微镜：50mm/0.01mm；135照相胶片钠灯m V。m为 位是（gcm （2）胶片的体积：V(abnS)h，a为胶片的长度，使用钢尺测量胶片长度,起点,而是选取某个初度数a作为起点测量,测量读出末读数为a,则其边长度为a

a

a

，胶片长度aa

a

n（3）单个齿孔的面积：Sxy，x为齿孔的长度，y为齿孔的宽度，都使用4r2r20.137mm2。

mabn(xy)h（4）135胶片如下图所示： b a的厚度h，先将千分尺调零，读出初读数h并记录，然后进行测量，读出末读数h并记录，则每次的测量厚度：

hh

0 i 末 记下主尺与测微鼓轮示数x，两次读数之差即为胶片的长度xxx；同n 样测其宽时对应有y、y、宽为yyy。记录好实验数据。 CALaaia初a出现CAL-时，即松手，显示器就出现CAL-100其中“100”为闪烁码，表示校准砝码a20.0030.0025.00

末读数a 172.45182.32177.39

152.45152.32152.39

表1宽度、厚度、质量厚h(mm)

h(mm)

h(mm

h

hh末

(mm)(mg)123

34.8634.9034.90

0.1210.1210.122

0.1270.1270.128806.445

34.8834.8834.88

0.1220.1210.127

0.1280.127表2表3的长和宽 长x(mm) 宽y(mm) xxx yyy n 12345平均

24.09023.65722.38222.963

21.22821.27320.82819.57519.1192.832

2.8622.8202.8292.8072.844

31.66331.69628.25927.43826.107

29.65829.69226.25825.42924.0922.007

2.0052.0042.0012.0092.015齿孔个数n=64. 仪器误差：minst0.2mg；ainst0.5mm；binst0.02mmhinst0.004mm；xinst0.004mm；yinst0.004mm；其不确定度:Um=K仪0.2mga 20.09mm 152.45152.39152.32152.39n134.8634.8634.88 34.9034.88 34.9034.88 34.8834.88 34.8834.88

a

a

下边缘152.45152.32152.39mm

a

a

0.5mm0.29mm

a

i1

(aa)2

Uu2S20.2920.0920.30mma a a则胶片的长度:aaUa152.390.30mm

bbbbbb 1 2 3 4

0.020.01mm

1n51

2 2 2 2 Uu2S20.0120.0220.02mm 则胶片的宽度:bbUb34.880.02

hhhhhh 1 2 3 4 0.1270.1270.1280.1280.127

0.127yyy1y2y3y4y其不确定度公式其不确定度公式:un10.1270.1270.127 0.1270.12734.9034.88 0.1280.1270.1270.128 1n(hih)2

0.0040.002mm51

Uu2S20.00220.00120.002mm 则胶片的厚度:hhUh0.1270.002mm

xxxxxx 1 2 3 4 2.8622.8202.8292.8072.844

0.0040.002mm

2 2 2 51 Uu2S20.00220.02020.020mm

5Y0.0040.002mm

r1.7%n1n(yiy)251Uu2S20.00220.00520.005mm abn(xy)h

152.3934.88642.8322.0070.1370.127mm

31.280gcm3 2 2 2 2