Patent ID: 9739788
Date: 2017-08-22
CPC Classifications: C12M,G01N

Claim:
1. A detection system comprising: a blood culture bottle comprising a sample medium; a colorimetric sensor positioned in the blood culture bottle and subject to change of color due to change in pH or CO a sensor LED illuminating the colorimetric sensor; a reference LED illuminating the colorimetric sensor; a control circuit configured to selectively and alternately activating the sensor LED and the reference LED; and a photodetector, the photodetector configured to measure reflectance from the colorimetric sensor during the selective and alternating illumination of the colorimetric sensor with the sensor LED and the reference LED and configured to generate intensity signals; a computer receiving the intensity signals, the computer including a memory storing a calibration relationship between intensity signals for the reference LED as a function of distance of the bottle from a home position in relation to the detection arrangement; wherein the reference LED has a peak wavelength of illumination between 750 and 900 nm.