Laser diode liquid-level/distance measurement

Details Laser diode liquid-level/distance measurement Laser diode liquid-level/distance measurement

G - Physics

01

S

G01S 17/32 (2006.01) G01F 23/28 (2006.01) G01F 23/292 (2006.01) G01F 23/68 (2006.01) G01S 7/48 (2006.01) G01S 17/88 (2006.01)

Patent

CA 2120504

2120504 9311449 PCTABS00022 A laser diode distance measurement device includes a laser diode assembly (10), comprising a laser diode and photodiode, which emits light (17) to a lens (19) which provides collimated light (20) incident on a float (22) which is covered with reflective tape on its top surface (24). The light (20) is reflected from the float (22) back to the laser diode assembly (10) which caused the assembly (10) to provide a signal having magnitude pulses (due to coherent interference) on a line (15) to a liquid level measurement circuit (14) related to the distance L to the float (22). Use of the collimated beam (20) and reflective tape on the float (22) minimizes speckle while providing adequate optical intensity feedback. The laser assembly (10) is driven by a sawtooth waveform signal that reduces electronic processing. The distance measurement circuit (14) blanks-out the feedback signal during discontinuities of the laser diode drive signal to minimize associated noise from distorting the distance measurement. Alternatively, the float may be omitted and the tube (11) made small enough to provide a meniscus effect curvature at a liquid surface (250) which provides a curved reflective surface to reflect the incident light (20), in a consistent fashion, back to the laser assembly (10).

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