Abstract: In one embodiment, a beam detector includes a first aperture plate including a first passage hole, a second aperture plate including a second passage hole that allows a single detection target beam passing through the first passage hole to pass therethrough, and a sensor detecting a beam current of the detection target beam passing through the second passage hole. The second aperture plate includes an electrically conductive material, a plurality of third passage holes are formed around the second passage hole, and the plurality of third passage holes allow light to pass therethrough.

Abstract: An example ion mobility spectrometry system includes a drift chamber, an ion detector, a thermal sensor, and processing circuitry. The drift chamber is configured to receive an ionized sample and an ionized calibrant. The ion detector is configured to generate a drift signal in response to detecting drifted ions at a predetermined position along the drift chamber. The thermal sensor is configured to generate a temperature signal indicative of a temperature of the drift chamber. The processing circuitry is configured to determine, based on the temperature signal, a mobility relation for a target species; determine, based on the drift signal, calibrant and sample drift times; determine, based on the mobility relation and the calibrant drift time, a target drift time; and detect the target species in the ionized sample by comparing the sample drift time with the target drift time.