APPARATUS FOR THERMAL LENS SPECTROSCOPY Russian patent published in 2012 - IPC G01J3/30 G01N25/00 

FIELD: physics.

SUBSTANCE: apparatus includes an optical cuvette in which there is a dielectric diaphragm having a hole at the centre, and two electrodes lying on both sides of the diaphragm and connected to an electric power supply unit, a laser for probing the formed thermal lens, and a unit for measuring laser radiation with an input diaphragm, equipped with a semitransparent plate, lying at an angle of 45° to the incident laser beam and directing the radiation into the hole of the diaphragm of the cuvette, and a reflecting mirror lying behind the cuvette on the path of the laser beam. The apparatus also has a unit for monitoring stability of operation of the laser with an input diaphragm and a laser radiation modulator, lying on the path of the laser beam behind and in front of the semitransparent plate, respectively, and a control and recording unit. Outputs of the units for measuring laser radiation and monitoring stability of operation of the laser are connected to inputs of synchronising detectors whose outputs are connected to the input of the control and recording unit. The output of the latter is connected to the input of the laser radiation modulator.

EFFECT: high accuracy, sensitivity and reproducibility of measurements.

3 cl, 1 dwg