| 摘要 |
<p>The invention relates to a monochromator meant to supply the spectrophotometers with a monochromatic light radiation by means of a group of LEDs, each emitting on a certain wavelength specific to a certain chemical species, thereby being possible to perform a quantitative and qualitative spectrophotometric analysis of a solution to be analyzed. According to the invention, the monochromator comprises a rotating body (1) containing a system comprising a ball (2) and a spring (3) for indexing and putting under voltage in order to select, center and power supply some LEDs (L...L), when the LEDs are brought by the manual rotation of the rotary body (1) on the optical path of a molecular absorption spectrometer formed in its turn of a group (4) of collimating lenses, an optical diaphragm (5), a tank (6) with the solution (s) to be analyzed, a photoelectric detector (7), an electronic amplifier (8) and a system (9) for data acquisition, processing and display.</p> |
