presentazione standard di powerpoint · the «low cost» concept 1 - monitoring station cost a...

FONOMOCParis – March 2017

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Luca Nencini

The noise monitoring network

Luca Nencini (Blue Wave Srl)

DYNamic Acoustic MAPping

DYNAMAP


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Luca Nencini

The tasks currently carried out by Blue Wave Srl in the Dynamap project are:

- design and build reliable low cost noise monitoring stations with data transmission

- design and setup an online infrastructure for data collecting

INTRODUCTION


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Luca Nencini

THE «LOW COST» CONCEPT

What does «low cost noise monitoring» system means?

When planning to setup a «low cost» monitoring network, the following

parameters must be considered:

1 - Monitoring station cost

2 - Maintenance cost as a function of sensors reliability over time

The final cost is the sum of the two parts. Lowering too much the first will make

higher the second.


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Luca Nencini


1 - Monitoring station cost

A noise monitoring system with data transmission can roughly cost from 100 € to

about 10’000 €, ranging from DIY (Do It Yourself) to «high precision» class I.

Microphone cost ranges from 1 € to 1’000 €

Preamplifier cost ranges from 0 € (integrated in microphone) to 1’000 €

Electronic processing unit cost ranges from 50 € to 5’000 €

Modem cost ranges from 50 € to 1’000 €


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Luca Nencini


2 - Maintenance cost as a function of sensors reliability over time

When taking in to account the cost of field calibration and replacement, a “cheap

electret” becomes expensive.

It turns out that the best choice is to invest at least 150 € - 250 € in the

microphone capsule.


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Luca Nencini

CHALLENGES WITH THE OPEN SOURCE HARDWARE

Nowadays it appears to be an easy task to built a noise monitoring station by

connecting a consumer microphone to one of the many open-source

hardware platforms (mini computers) available today

Everything seems to work good at the beginning


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Luca Nencini

But this happen just in an indoor environment. Those devices are not

intended to work outdoor !

When this instrumentation is installed outdoor it is exposed to:

- sun UV and heat

- saline corrosive agents

- gases

- dust particulate

- electrostatic charges

- electromagnetic interference



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Luca Nencini

Temperature raises up to 70 Celsius degrees inside a sensor box left under the

sun in august. So industrial grade electronic equipment had to be chosen

instead of a generic open source hardware.



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Luca Nencini

SOME TEST ON MICROPHONES

The ANAS salt spray chamber was

used to simulate corrosion in extreme

conditions (high temperature at 40

degrees, 95% humidity, sodium

chloride 5% concentration)

In order to accelerate any ionic

corrosion process, microphones

were kept powered

4 MEMS

4 Electrets


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Luca Nencini

SOME TEST ON MICROPHONES

At the end of the test, electret microphones

were chosen instead of MEMS microphone

due to their better resistance in harsh

environment


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Luca Nencini

DYNAMAP HARDWARE

Hardware specifications:

Size: 8 x12 x16 cm

Weight: less than1 Kg

Average power consumption: about 1.5 W, peak 2.5 W

Data transmission capability: 3G, Ethernet , Wi-FI, Blue Tooth

Protection: removable microphone windshield and rain protection

Positioning: 1 meter distance from Anas portal or lamp post (only Rome site)

Cabling: 7 meters or 20 meters power cable (only Rome site)


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Luca Nencini

A: 76 mm

E: 158 mm

L: 118 mm

IP 56 Box

Hardware specifications:

DYNAMAP HARDWARE


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Microphone: ¼ Inch Microphone electret, inox AISI310

Preamplifier: internal preamplifier with 20 dB Gain, + 5V powered

Electric floor noise: 32 dB(A)

Connector: IP67 connector

Microphone specifications (Only Rome installation):

DYNAMAP HARDWARE


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DYNAMAP HARDWARE


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DYNAMAP HARDWARE


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Software screenshots:

DYNAMAP SOFTWARE


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DYNAMAP SOFTWARE


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DYNAMAP SOFTWARE


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Two types of sensors are being developed in the Dynamap project:

- High Capacity: with more expensive internal components and capable of

performing complex tasks, like advanced signal processing and noise

source classification.

- Low Capacity: with less expensive internal components and less power

absorption, they can be powered by a small solar panel. They are an

engineered version of High Capacity sensors.

PROGRESS OF THE PROJECT


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Luca Nencini

Thanks for your attention

Luca Nencini

[email protected]

presentazione standard di powerpoint · the «low cost» concept 1 - monitoring station cost a...

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