Smoke detection in air

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) MODEL SR830 DSP Lock-In Amplifier

2) BWP34 Silicon PIN Photodiode

3) WAVESURFER 104MXS Oscillator

4) Capacitor (50V 22uF)

5) LED (Green)

6) Resistor (1.2K)

7) DC Voltage source (MATRIX MODEL: MPS-3005L-3)

Overall Setup

Schematics