A method to process a laboratory carrier in a laboratory system based on a feature of a test liquid in the laboratory carrier , wherein the laboratory system comprises the laboratory carrier comprising the test liquid , a terahertz wave source , a terahertz detector , a laboratory carrier processing device , and a control unit communicatively connected to the terahertz wave source , terahertz detector , and laboratory carrier processing device , wherein the method comprises the following steps : a) placing the laboratory carrier in between the terahertz wave source and terahertz detector b) irradiating, by the terahertz wave source , the laboratory carrier comprising the test liquid with terahertz waves c) measuring, by the terahertz detector , intensities of the terahertz radiation reaching the terahertz detector d) generating, by the control unit , an image comprising different absorption strengths of the irradiated laboratory carrier comprising the test liquid based on the measured intensities of the terahertz radiation reaching the terahertz detector , wherein a first absorption strength range relates to the test liquid , a second absorption strength range relates to the laboratory carrier , and a third absorption strength range relates to air, wherein the first, second, and third absorption strength ranges are different e) detecting, by the control unit , a liquid outline of the test liquid , a carrier outline of the laboratory carrier , and an air outline based on the first, second, and third absorption strength ranges f) determining, by the control unit , the feature of the test liquid in the laboratory carrier based on the detected liquid outline , the detected carrier outline , and the detected air outline g) controlling, by the control unit , the laboratory carrier processing device to process the laboratory carrier in the laboratory system based on the determined feature of the test liquid in the laboratory carrier . a) placing the laboratory carrier in between the terahertz wave source and terahertz detector b) irradiating, by the terahertz wave source , the laboratory carrier comprising the test liquid with terahertz waves c) measuring, by the terahertz detector , intensities of the terahertz radiation reaching the terahertz detector d) generating, by the control unit , an image comprising different absorption strengths of the irradiated laboratory carrier comprising the test liquid based on the measured intensities of the terahertz radiation reaching the terahertz detector , wherein a first absorption strength range relates to the test liquid , a second absorption strength range relates to the laboratory carrier , and a third absorption strength range relates to air, wherein the first, second, and third absorption strength ranges are different e) detecting, by the control unit , a liquid outline of the test liquid , a carrier outline of the laboratory carrier , and an air outline based on the first, second, and third absorption strength ranges f) determining, by the control unit , the feature of the test liquid in the laboratory carrier based on the detected liquid outline , the detected carrier outline , and the detected air outline g) controlling, by the control unit , the laboratory carrier processing device to process the laboratory carrier in the laboratory system based on the determined feature of the test liquid in the laboratory carrier . <EOS>