Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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Available model flags: --110m, --tdt-600m, --rnnt-600m, --sortformer. All Google Benchmark flags (--benchmark_filter, --benchmark_format=json, --benchmark_repetitions=N) are passed through.