Transcript 06 Intoxilyzer 5000EN Theory and Operation

INTOXILYZER 5000EN
THEORY/OPERATION
Rev 3.09
6-1
Infra- Red Light Absorption
Infra - Red light is a form of energy known
as:
ELECTROMAGNETIC RADIATION
Fast
cosmic gamma
rays
rays
light
x-rays Ultra- visible infrared
violet
Slow
micr radio
o
wave
wave
The Electromagnetic Scale
Rev 3.09
6-2
All things will absorb
ELECTROMAGNETIC RADIATION
in their own
unique and consistent manner
Rev 3.09
6-3
THEREFORE
All things will absorb
INFRARED LIGHT
in their own
unique and consistent manner
And will create their own
unique and consistent
absorption pattern
Rev 3.09
6-4
THE IR FINGERPRINT
OF ETHANOL
3.47 Micron
Rev 3.09
6-5
SPECTROPHOTOMETRY
The science of measuring the
absorption of light or radiant
energy to identify and quantify
a substance
Rev 3.09
6-6
BASIC SPECTROPHOTOMETRY
PRINCIPLES
Less Concentrated/ Appears Lighter
Incidental
Radiation
Rev 3.09
Emerging
Radiation
More Concentrated/ Appears Darker
Incidental
Radiation
Emerging
Radiation
6-7
SPECTROPHOTOMETER
An instrument that is able to
use light or radiant energy to
identify and quantify a
substance
Rev 3.09
6-8
SPECTROPHOTOMETER
(INTOXILYZER 5000EN)
An instrument that is able to
use light (Infrared Light) or
radiant energy to identify and
quantify a substance (Ethanol).
Rev 3.09
6-9
SPETROPHOTOMETRIC
RELATIONSHIPS
1. Measurements determine
concentration.
2. Measurements are made relative to a
standard (known) concentration.
3. Quantitative analysis is governed by
the BEER- LAMBERT LAW.
Rev 3.09
6-10
BEER - LAMBERT LAW
Absorption is directly
proportional to
concentration.
Rev 3.09
6-11
BEER - LAMBERT LAW
(GRAPHIC REPRESENTATION)
A
B
S
O
R
B
A
N
C
E
Rev 3.09
CONCENTRATION
6-12
INTERACTION OF INFRARED
ENERGY WITH THE ETHANOL
MOLECULE
H
H
H
C
H
C
H
C
H
C
OH
H
Rev 3.09
H
OH
H
H
6-13
BREATH SAMPLE ANALYSIS
STEP # 1
LENS
Sample Chamber
Photo
Detector
LENS
Light
Source
Filter
the light striking the photo detector produces
a level of energy labeled as X
Rev 3.09
6-14
BREATH SAMPLE ANALYSIS
STEP # 2
Breath Sample In
LENS
Sample Chamber
Photo
Detector
LENS
Light
Source
Sample Out
The light striking the photo detector produces
Filter
a level of energy labeled as X
Rev 3.09
The light striking the detector after alcohol is
introduced produces a different level of energy
labeled as Y
6-15
Infra-Red Theory
If we establish the amount of IR light able to pass
through a chamber with
no alcohol present
X
Then establish the amount of IR light able to pass
through a chamber with alcohol present
Y
Then
X
Rev 3.09
-Y
= Alcohol
Concentration
6-16
BREATH SAMPLE ANALYSIS
LENS
Sample Chamber
Photo
Detector
LENS
Light
Source
3.80 - Reference
Filter
3.36, 3.40, 3.52 - Interferents
3.47 - Alcohol
Rev 3.09
6-17
ABSORPTION BAND OPTICAL
FILTERS
(TRANSMITTANCE IN PERCENT)
ETHANOL 3.47 MICRONS
REFERENCE 3.80 MICRONS
TOLUENE 3.36 MICRONS
ACETONE 3.40 MICRONS
Rev 3.09
ACETALDEHYDE, ISOPROPANAL, METHANOL,
ETHER, ETC 3.52 MICRONS
WAVELENGTH IN MICRONS
6-18
Rev 3.09
6-19