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channel. This will verify the mounting and interfacing characteristics of the

sensor, to ensure it falls within requirements. It should be inspected to ensure

that a proper pressure sample will be taken given the orientation of the sensor in

the flow channel. In addition, it should be verified that the sensor is not blocking

flow over or into the alcohol sensor.

After this is completed, a small amount of airflow from a human breath should be

directed into or onto the airflow or pressure detection mechanism. At this point,

any sort of result should be verified in the rest of the system. The approximate

same level of exhalation effort and amount should then be directed into the

mechanism again, and a similar result verified. Alternatively, a low pressure

mechanical pressure exertion device can be used, such as a low pressure can of

compressed air or perhaps a medical inhaler (which contains no chemicals). If

the results are indeed similar, this portion of the test is passed. Then, a deep

breath, similar to the one required for alcohol testing, should be performed on the

detection mechanism to ensure a proper reading is obtained, and for the proper

duration. This test should then be repeated two more times to ensure the sensor

produces consistent results within an acceptable range to prove its utility in the

application of deep lung exhalation detection.

Table 5.2.6-1 provides the results of repeated testing and evaluation of the

pressure detection system of the Voog handheld breathalyzer. Based on this

data, a threshold value was established to determine the strength and quantity of

breath flow necessary for a sufficient sample reading.

Differential Pressure Sensor Output

Input Sample

Reference Voltage

ADC Output

(1.46 mv/step)

No Breath

1.5V

750

Breath Sample 1

(minimal)

1.5V

723

Breath Sample 2

(less minimal)

1.5V

690

Breath Sample 3

(ideal)

1.5V

652

Breath Sample 4

(maximum)

1.5V

595

Table 5.2.2-1 Pressure Sensor Test Data

5.3 Software Verification Requirements

Much like the hardware components of a complete system design, the software

components must also have established requirements for the confirmation of

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