The utility model discloses a
light spot forming device for
light source detection, which comprises a
lens plate, a box body, an optical lens, a
zoom lens, a focusing lens and a
light source, the
lens plate is obliquely arranged and is arranged above the box body in a height-adjustable manner, the optical lens is fixed at the top end of the box body, the
zoom lens is fixed at the top end of the box body, and the focusing lens is fixed at the top end of the box body. The
zoom lens, the focusing lens and the
light source are all arranged in the box body from bottom to top, the
zoom lens and the focusing lens are connected with the box body in a vertically adjustable mode, and the optical lens, the
zoom lens, the focusing lens and the light source are all located on the same axis; according to the utility model, the
spectrograph can be adjusted without directly looking at a light source by human eyes, so that the damage to the human eyes is avoided, the adjustment during testing can be facilitated, the accuracy of
test data is ensured, the
test efficiency can be accelerated, and convenience and rapidness are realized.