Introduction

Water analyzer

It is an instrument for analyzing the characteristics of water and the specific substances contained. It plays an important role in water environment monitoring.

Gas analyzer

It is an instrument for the analysis of the composition of environmental gases, used for the detection of atmospheric composition in specific occasions, such as O2, CO2, CO, CH4 monitoring.

Brief introduction of principle

There are several methods for water and gas analysis

1. Chemical detection

The disadvantages are short life and replacement needed.

2. Photoelectric detection (Beer Lambert Law applied)

Good accuracy and linearity. Long life and no need to replace.

Beer Lambert Law

Beer Lambert Law: when a beam of parallel monochromatic light passes vertically through a certain light absorbing substance which is uniform and non-scattering. The absorbance A is proportional to the concentration C of the absorbing substance and the thickness B of the absorbing layer.
The mathematical formula is as follows:
A=lg(1/T)=Kbc
Where A is the absorbance, T is the transmissivity, the ratio of transmitted light intensity to incident light intensity,
c is the concentration of light absorbing substances, b is the thickness of absorption layer.

Principle block diagram

A particular composition in water or gas will absorb monochromatic light of a specific wavelength. The higher the concentration of the specific component is, the more monochromatic light it absorbs and the less light it transmits.

Recommended model

Light source:

Halogen lamp

Full spectrum energy of (340-2000nm supplied). Operate with filter to provide monochromatic light.

LED

Laser diode (VCSEL laser diode, e.g. 763nm, 948nm)

Mid infrared light source (2μm-12μm spectral energy supplied)

Receiver

Solar cells

Types of common silicon:

PC10-6,PIN-13DSB,PIN-6.6DPC, UV-035DQ, UV-005DQ,etc

Others:

Ge,InGaAs,PbS,PbSe,etc