Camera, handlens, and microscope optical system for imaging and coupled optical spectroscopy
An optical system comprising two lens cells, each lens cell comprising multiple lens elements, to provide imaging over a very wide image distance and within a wide range of magnification by changing the distance between the two lens cells. An embodiment also provides scannable laser spectroscopic measurements within the field-of-view of the instrument.
1. An optical system, comprising:
a first lens cell comprising:
a biconcave lens element having an index of refraction to within 25% of 1.75 and an Abbe number to within 25% of 35.3;
a first biconvex lens element having an index of refraction to within 25% of 1.44 and an Abbe number to within 25% of 95.0;
a positive meniscus lens element having an index of refraction to within 25% of 1.52 and an Abbe number to within 25% of 59.3;
a negative meniscus lens element having an index of refraction to within 25% of 1.52 and an Abbe number to within 25% of 59.3; and
a second biconvex lens element having an index of refraction to within 25% of 1.52 and an Abbe number to within 25% of 59.3.
2. The optical system as set forth in claim 1 , having a variable magnification range from 0 to 10.
3. The optical system as set forth in claim 1 , having a variable magnification range from 0 to 20.
4. The optical system as set forth in claim 1 , having a variable magnification range from 0 to 5.
5. The optical system as set forth in claim 1 , further comprising a second lens cell comprising:
a biconcave lens element having an index of refraction to within 25% of 1.52 and an Abbe number to within 25% of 59.3; and
a biconvex lens element having an index of refraction to within 25% of 1.52 and an Abbe number to within 25% of 59.3.