A mode-filtered light sensor has been developed for @entity577 ( @entity578 ) gas determination at ambient conditions. The proposed chemosensor consisted of an annular column which was constructed by inserting an optical fiber coated with a thin @entity1346 cladding of @entity69874 into a fused- @entity3440 capillary. When @entity578 was introduced to the sensor, selective inclusion of @entity578 into the @entity1346 layer would cause a change in the local refractive index of the cladding, resulting in the change of mode-filtered light that emanated from the fiber. Three detection windows were set alongside the capillary to propagate the light to a @entity11339 ( @entity11339 ). The changes of mode-filtered light on exposure to various concentrations of @entity578 were thus simultaneously monitored. The mode-filtered light intensity decreased with the increase in concentration of @entity578 . The dynamic concentration range of the sensor for @entity578 was 0.0-16.0% v/v with a detection limit of 0.15% v/v. The highest sensitivity was found at the channel furthest away from the excitation light source. The response time (t(95%)) was about 5min. The reproducibility was good with a relative standard deviation (RSD) of less than 7% from evaluating six @entity69874 -coated fibers. @entity26 , @entity3884 and @entity544 showed very little interference on detection but interferences from @entity1044 and @entity4314 were observed. The proposed mode-filtered light sensor has been successfully applied to determine @entity578 samples and the accuracy was good. Our work offers a promising approach for @entity578 detection.

Mode-filtered light XXXX gas sensor based on @entity69874 .

@entity4314 :: ('MESH:D002251', 'Chemical') :: ['carbon tetrachloride'] @entity3884 :: ('MESH:D006859', 'Chemical') :: ['hydrogen'] @entity1044 :: ('MESH:D008752', 'Chemical') :: ['dichloromethane'] @entity69874 :: ('MESH:C545484', 'Chemical') :: ['cryptophane A'] @entity26 :: ('MESH:D010100', 'Chemical') :: ['Oxygen'] @entity11339 :: ('MESH:D058747', 'Disease') :: ['charge-coupled device', 'CCD'] @entity577 :: ('MESH:D008697', 'Chemical') :: ['methane'] @entity1346 :: ('MESH:D012828', 'Chemical') :: ['silicone'] @entity3440 :: ('MESH:D012822', 'Chemical') :: ['silica'] @entity544 :: ('MESH:D002245', 'Chemical') :: ['carbon dioxide'] @entity578 :: ('CHEBI:16183', 'Chemical') :: ['CH(4)']
@entity577 :: (MESH:D008697,Chemical) :: ['methane']
