| 摘要 |
<p>A liquid level gauge (10) utilizes a liquid tight plastic envelope (44) carrying an alongate p-c board (48) that has a light source (52) mounted so as to direct light laterally thereof, and a light sensor (54) also mounted so as to receive light from a direction which is lateral of the board. The gauge further has a lens configuration (45) which is part of the envelope, for providing a largely solid, reflective path for light which emanates at the light source and is to be received at the light sensor. When the exterior of the envelope is surrounded by either air or liquid, changes in the amount of light that is reflected by the lens occur, and are measured by the light sensor (54).</p> |
