Which detector relies on drawing air samples through a humid chamber to reveal smoke?

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The idea here is to visualize smoke by making it condense in a humid environment. A cloud chamber air sampling detector draws air through a chamber kept very humid so that smoke particles act as nuclei for condensation. When the air carrying smoke passes through, moisture condenses onto those particles, forming tiny droplets that become visible as a cloudy trail. The active air flow is key because it brings more particles into the humid chamber to reveal them.

Other detectors detect heat or flame rather than visualizing smoke. A fixed temperature detector responds to reaching a specific heat level, not to airborne particles. A flame detector looks for flame radiation, not condensed droplets in a humid chamber. A glass bulb detector is a heat sensor that relies on the expansion and breakage of a liquid-filled bulb, not on drawing air through humidity to reveal smoke.