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多年来,人们都用Jones 介绍的D~* 数值来描述探测器的性能。它的基本含义是:一定的输出电压(或电流)相应于探测器上一定的输入功率P,总噪声N 与带宽B 的方根和探测器面积A 的方根成比例。所以D~*≡(AB)~(1/2)/P。这是对单个波长λ或对特定的辐射源,即500°K的黑体而言。因此,D~* 必须包括有一个说明范围,它或者是D~* (500,……,1),或者是D~(?)(λ,……,1)。前一括号内的第一个数字表示黑体的温度(°K),第二个表示调制频率(赫),第三个表示噪声的带宽(必须是1);后一括号内的第一项数字表示波长的变化,第二、第三项变量同前一括号内的一样。D_(λPK)~*往往是指定的量,这就是峰值响应波长的D~*值。
For years, people used the D ~ * values introduced by Jones to describe the detector's performance. Its basic meaning is: a certain output voltage (or current) corresponds to a certain input power P on the detector, and the total noise N is proportional to the square root of the bandwidth B and the square root of the detector area A. So D ~ * ≡ (AB) ~ (1/2) / P. This is for a single wavelength λ or for a specific radiation source, ie 500 ° K for the blackbody. Therefore, D ~ * must include an explanation range, which is either D ~ * (500, ..., 1) or D ~ (?) (Λ, ..., 1). The first number in the previous parentheses indicates the temperature of the blackbody (° K), the second indicates the modulation frequency (Hz), the third indicates the bandwidth of the noise (must be 1); the first digit Said the wavelength change, the second and third variables with the same parentheses. D_ (λPK) ~ * is often the specified amount, which is the D ~ * value of the peak response wavelength.