| 摘要 |
The device (18) has an LED (24) for emitting a light beam, and photodiode (26) to detect a portion of the light beam emitted by the LED. A part (22) made of a material e.g. glass, enables propagation of the light beam emitted by the LED, where the part includes a surface (28) to contact a urea solution (14) in a storage tank (12). The LED, the photodiode, and the part are arranged such that the light beam emitted by the LED is propagated through the surface of the part, by reflection or by refraction, toward the photodiode. Independent claims are also included for the following: (1) a storage tank for storing urea solution (2) a method for monitoring a urea solution in a storage tank. |
