Question: which type of fire detector uses the effect of smoke on a light source and photo-electric cell
[{'answer': 'optical smoke detector', 'provenance': [{'wikipedia_id': '341287', 'title': 'Smoke detector', 'start_paragraph_id': 18, 'start_character': 20, 'end_paragraph_id': 18, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Design.:Photoelectric.\n'}]}, {'answer': 'The photoelectric ( optical ) smoke detector'}, {'answer': 'photoelectric , or optical smoke detector'}, {'provenance': [{'wikipedia_id': '341287', 'title': 'Smoke detector', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 1377, 'bleu_score': 0.9911697618108691, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8925709049581397646}, 'section': 'Section::::Design.:Photoelectric.\n'}]}, {'provenance': [{'wikipedia_id': '341287', 'title': 'Smoke detector', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 133, 'bleu_score': 0.9067110266941041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8925709049581397646}, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '8202959', 'title': 'Thermal imaging camera', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['A thermal imaging camera (colloquially known as a TIC) is a type of thermographic camera used in firefighting. By rendering infrared radiation as visible light, such cameras allow firefighters to see areas of heat through smoke, darkness, or heat-permeable barriers. Thermal imaging cameras are typically handheld, but may be helmet-mounted. They are constructed using heat- and water-resistant housings, and ruggedized to withstand the hazards of fireground operations.\rhighlight sentence(s) containing evidence, not only the answer', 'A thermal imaging camera (colloquially known as a TIC) is a type of thermographic camera used in firefighting. By rendering infrared radiation as visible light, such cameras allow firefighters to see areas of heat through smoke, darkness, or heat-permeable barriers. Thermal imaging cameras are typically handheld, but may be helmet-mounted. They are constructed using heat- and water-resistant housings, and ruggedized to withstand the hazards of fireground operations.', 'A thermal imaging camera (colloquially known as a TIC) is a type of thermographic camera used in firefighting. By rendering infrared radiation as visible light, such cameras allow firefighters to see areas of heat through smoke, darkness, or heat-permeable barriers. Thermal imaging cameras are typically handheld, but may be helmet-mounted. They are constructed using heat- and water-resistant housings, and ruggedized to withstand the hazards of fireground operations.']}}]}, {'provenance': [{'wikipedia_id': '341287', 'title': 'Smoke detector', 'section': 'Section::::Design.:Photoelectric.\n', 'start_paragraph_id': 18, 'end_paragraph_id': 18, 'meta': {'evidence_span': ['A photoelectric, or optical smoke detector contains a source of infrared, visible, or ultraviolet light (typically an incandescent light bulb or light-emitting diode), a lens, and a photoelectric receiver (typically a photodiode). In spot-type detectors all of these components are arranged inside a chamber where air, which may contain smoke from a nearby fire, flows. In large open areas such as atria and auditoriums, optical beam or projected-beam smoke detectors are used instead of a chamber within the unit: a wall-mounted unit emits a beam of infrared or ultraviolet light which is either received and processed by a separate device, or reflected back to the receiver by a reflector. In some types, particularly optical beam types, the light emitted by the light source passes through the air being tested and reaches the photosensor. The received light intensity will be reduced due to scattering from particulates of smoke, air-borne dust, or other substances; the circuitry detects the light intensity and generates the alarm if it is below a specified threshold, potentially due to smoke. In other types, typically chamber types, the light is not directed at the sensor, which is not illuminated in the absence of particles. If the air in the chamber contains particles (smoke or dust), the light is scattered and some of it reaches the sensor, triggering the alarm.\rhighlight sentence(s) containing evidence, not only the answer', 'A photoelectric, or optical smoke detector contains a source of infrared, visible, or ultraviolet light (typically an incandescent light bulb or light-emitting diode), a lens, and a photoelectric receiver (typically a photodiode). In spot-type detectors all of these components are arranged inside a chamber where air, which may contain smoke from a nearby fire, flows. In large open areas such as atria and auditoriums, optical beam or projected-beam smoke detectors are used instead of a chamber within the unit: a wall-mounted unit emits a beam of infrared or ultraviolet light which is either received and processed by a separate device, or reflected back to the receiver by a reflector. In some types, particularly optical beam types, the light', 'A photoelectric, or optical smoke detector contains a source of infrared, visible, or ultraviolet light (typically an incandescent light bulb or light-emitting diode), a lens, and a photoelectric receiver (typically a photodiode). In spot-type detectors all of these components are arranged inside a chamber where air, which may contain smoke from a nearby fire, flows. In large open areas such as atria and auditoriums, optical beam or projected-beam smoke detectors are used instead of a chamber within the unit: a wall-mounted unit emits a beam of infrared or ultraviolet light which is either received and processed by a separate device, or reflected back to the receiver by a reflector. In some types, particularly optical beam types, the light emitted by the light source passes through the air being tested and reaches the photosensor. The received light intensity will be reduced due to scattering from particulates of smoke, air-borne dust, or other substances; the circuitry detects the light intensity and generates the alarm if it is below a specified threshold, potentially due to smoke. In other types, typically chamber types, the light is not directed at the sensor, which is not illuminated in the absence of particles. If the air in the chamber contains particles (smoke or dust), the light is scattered and some of it reaches the sensor, triggering the alarm.']}}]}, {'provenance': [{'wikipedia_id': '341287', 'title': 'Smoke detector', 'section': 'Section::::Design.:Photoelectric.\n', 'start_paragraph_id': 20, 'end_paragraph_id': 20, 'meta': {'evidence_span': ['deactivated by occupants." Although photoelectric alarms are highly effective at detecting smoldering fires and do provide adequate protection from flaming fires, fire safety experts and the National Fire Protection Agency recommend installing what are called combination alarms, which are alarms that either detect both heat and smoke, or use both the ionization and photoelectric processes. Some combination alarms may include a carbon monoxide detection capability. The type and sensitivity of light source and photoelectric sensor, and type of smoke chamber differ between manufacturers. Carbon monoxide sensors detect potentially fatal concentrations of\rhighlight sentence(s) containing evidence, not only the answer', 'deactivated by occupants." Although photoelectric alarms are highly effective at detecting smoldering fires and do provide adequate protection from flaming fires, fire safety experts and the National Fire Protection Agency recommend installing what are called combination alarms, which are alarms that either detect both heat and smoke, or use both the ionization and photoelectric processes. Some combination alarms may include a carbon monoxide detection capability. The type and sensitivity of light source and photoelectric sensor, and type of smoke chamber differ between manufacturers. Carbon monoxide sensors detect potentially fatal concentrations of', 'deactivated by occupants." Although photoelectric alarms are highly effective at detecting smoldering fires and do provide adequate protection from flaming fires, fire safety experts and the National Fire Protection Agency recommend installing what are called combination alarms, which are alarms that either detect both heat and smoke, or use both the ionization and photoelectric processes. Some combination alarms may include a carbon monoxide detection capability. The type and sensitivity of light source and photoelectric sensor, and type of smoke chamber differ between manufacturers. Carbon monoxide sensors detect potentially fatal concentrations of']}}]}]