Smoke detection in air

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Introduction

Smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial smoke detectors issue a signal to a fire alarm control panel as part of a fire alarm system. Household smoke detectors, also known as smoke alarms, generally issue an audible or visual alarm from the detector itself or several detectors if there are multiple devices interlinked [1].


Lock-In Amplifier

Measure small signals in a large background (huge noise).

Mathematical Description

Signal Variation

Logic Flow

Component List

1) DC Voltage source (MATRIX MODEL: MPS-3005L-3)
2) MODEL SR830 DSP Lock-In Amplifier
3) BWP34 Silicon PIN Photodiode
4) WAVESURFER 104MXS Oscillator
5) Capacitor (50V 22uF)
6) Resistor (1.2K)
7) LED (Green)

Experiment

Overall Setup

We can divide this experimental set up into two parts, the first part is detection.

Lock-In Amplifier Setup

Schematics