我们在长期使用θ-24型摄谱仪中,发现所测元素谱线缓慢变宽,灵敏度下降,直到该元素含量较低的一号二号标准样谱线黑度和背景几乎相近,做不出工作曲线。经过验证,找出了原因,并对仪器作了调整,效果满意。θ-24型摄谱仪的准光镜不是球面镜,而是平凸透镜。照相盒物镜不是二个透镜组,而是一个复合透镜 We are in the long-term use of θ-24 spectrograph and found that the element spectrum slowly broadening, the sensitivity decreased until the elemental content of the lower level of the No. 1 No. 2 standard line of black and the background is almost similar, do not Out of the work curve. After verification, find out the reasons, and made adjustments to the instrument, the effect is satisfactory. The theta-24 spectrograph quasi-light mirror is not a spherical mirror, but a plano-convex lens. The camera lens is not a two lens group, but a compound lens