普通的照相记录是把光点在照相纸上进行感光,然后经过化学处理得被测量的变化曲线。这种方法是很麻烦、费时的,不能很快地得到被测量的变化情现。因此出现了一种直接记录纸。用这种直接记录纸,无需利用化学冲洗即可显出被测量的变化图象。要使照相纸感光,必须要有一定的光通量(即感光能量)照射到照相纸上,这就称 Ordinary photographic record is the light spot in the photographic paper on the photosensitive, and then through the chemical treatment was measured curve. This method is cumbersome, time-consuming and does not quickly lead to the measured changes. Therefore, a direct recording paper appeared. With this type of direct recording paper, a change image to be measured can be displayed without using a chemical rinse. To make photographic paper sensitive, there must be a certain amount of luminous flux (ie, photographic energy) shines on the photographic paper, which is called