CO2Meter, Inc.
The Science Behind SST`s LuminOx Technology (Optical Oxygen Sensor) | SST Sensing - Video
Under a filter an LED pulses light at a ruthenium coated dichroic mirror.
A dichroic mirror acts as an interference filter used to selectively pass light of a specific wavelength through it.
This light is then collected by a photodiode that generates a small electrical current which is passed to the PCB where a high accuracy timing circuit measures the rate of decay of the excited fluoroform.
This rate is inversely proportional to the oxygen level at a certain temperature, so a high accuracy temperature sensor is incorporated onto the PCB.
By also incorporating readings from an onboard high-resolution atmospheric pressure sensor and the temperature sensor, percentage oxygen can be calculated as well as output via the UART interface alongside partial pressure oxygen, temperature and pressure.
SST use a wideband pressure sensor onboard to allow the sensor to adjust for varying altitudes and vacuum applications.
The fluorescence material is bonded to a quartz carrier which scatters the light and aids in the speed of response.
And here is a short animation showing the process in operation.
When the LED is switched on the fluorescent material fluoresces and the amplitude increases.
And then in a low oxygen level, that fluorescent decay is a gradual slope back down to ground.
When oxygen is present in the environment, the oxygen reacts with that material and quenches the fluorescent material back to ground at a faster rate.
Our onboard PCB measures this rate with a timing circuit and the partial pressure of oxygen is calculated.
A dichroic mirror acts as an interference filter used to selectively pass light of a specific wavelength through it.
This light is then collected by a photodiode that generates a small electrical current which is passed to the PCB where a high accuracy timing circuit measures the rate of decay of the excited fluoroform.
This rate is inversely proportional to the oxygen level at a certain temperature, so a high accuracy temperature sensor is incorporated onto the PCB.
By also incorporating readings from an onboard high-resolution atmospheric pressure sensor and the temperature sensor, percentage oxygen can be calculated as well as output via the UART interface alongside partial pressure oxygen, temperature and pressure.
SST use a wideband pressure sensor onboard to allow the sensor to adjust for varying altitudes and vacuum applications.
The fluorescence material is bonded to a quartz carrier which scatters the light and aids in the speed of response.
And here is a short animation showing the process in operation.
When the LED is switched on the fluorescent material fluoresces and the amplitude increases.
And then in a low oxygen level, that fluorescent decay is a gradual slope back down to ground.
When oxygen is present in the environment, the oxygen reacts with that material and quenches the fluorescent material back to ground at a faster rate.
Our onboard PCB measures this rate with a timing circuit and the partial pressure of oxygen is calculated.
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