Krishna Vijayaraghavan

US Patent:

20110127090, Jun 2, 2011

Filed:

Nov 30, 2010

Appl. No.:

12/956891

Inventors:

Krishna Vijayaraghavan - Sunnyvale CA, US
Sean Pruden - Saint Louis Park MN, US
Rajesh Rajamani - Saint Paul MN, US

International Classification:

G01G 19/03
G01G 19/00

US Classification:

177133, 177145

Abstract:

In general, the disclosure is directed to techniques for sensing the weight of a load object passing over a measurement surface. In some examples, a weigh-in motion (WIM) sensor is provided that includes a first beam that exhibits a linear elastance function, and a second beam that exhibits a nonlinear elastance function. In additional examples, the WIM sensor may include a measurement circuit configured to generate information corresponding to a weight of the load object, a wireless transmission circuit configured to transmit the information to a receiving station, and an energy harvesting circuit configured to harvest an amount of energy from vehicle vibrations. The energy harvested may be sufficient to power the wireless transmission circuit. In further examples, a WIM system is provided that includes a sequence of sensors. Information from the sequence of sensors may be used to remove noise in the raw data due to vehicle vibration.