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A measuring system for retrieval of urban emission function from nightsky radiance dataDRAFT

A measuring system for retrieval of urban emission function from nightsky radiance data

Héctor Antonio Solano Lamphar

on 12 September 2014

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Transcript of A measuring system for retrieval of urban emission function from nightsky radiance dataDRAFT

Experimental device
Excavation is the process of loosening and removing earth or rock from its original postition in a cut and transporting it to a fill.
What about it..
Material are usually described as "rock" "loose rock" or "common" with "common" signifying all material not otherwise classified.
The emission function of ground based light sources.

Different researchers constantly require adequate data on the radiant or luminous intensity distribution.

Various approximations to the night-sky radiances are in use.

Characterized through a parameterized ”normalized” emission function. 1000 lumens per capita.

Variations can be expected depending upon secondary signals from buildings, blocking from terrain and vegetation.

A measuring system for retrieval of urban emission function from nightsky radiance data
1 Work in progress.
2 Future applications can be identified.
3 Targeted campaigns are planning.
Solano Lamphar HA, Kundracik F, Kocifaj M.
Department of experimental physics, ICA. Slovak academy of sciences.
e-mail: lamphar@gmail.com


1 Laptop.
2 Single-board ST Microelectronics microcontroler STM32F100x6.
3 Monolithic photodiode/ transimpedance amplifier).
4 Remote control canon RS-60E3.
5 Simple robotic arm (servo FUTABA S3003, light material and a special tissue).
6 Telephoto lens canon 55-250 mm.
7 DSLR camera.


1 High-level scripting language Python.
2 library PySerial.
3 Data is to be logged and stores as a text to a computer connected to the electronic controller via USB.
Preliminary experiments
In situ experiments
Preliminary results
Preliminary locations
A set of field campaigns is necessary to verify if what we measured in the atmosphere is the same as what is obtained numerically.
Ratios obtained theoretically
The development of an inexpensive automated and autonomous device that permits the retrieval of the emission fuction using DSLR cameras.

Identifying the night lighting variations and automatically calibrate the camera.

Avoiding thermal dependance of the sensor.
The effect of the ground surface can be automatically added.

The possibilities to have a control system in order to simplify the work during the measures and to optimize productivity.
Following the recently developed theoretical model. Based on the ratios of zenith luminance/horizontal illuminance. Local atmosphere properties.

The targeted experiments have to be made in the same night but at different distances from a city.
G is sensitive close to the city
F is sensitive far from the city

The photodiode controls the exposure, in situ callibration.

The device can operate accurately at various distances even if the radiant intensity varies over several orders of magnitude.
Zenith luminance/radiance and horizontal illuminance/irradiance)

Environmental problem that has serious consequences for the night environment.

Skyglow variations.
The angular city emission function in the upward direction.
It only works on programming.

We need to extract the natural light.

Retrieval of urban emission function from night sky luminance data.

CMOS sensors that can be used in the measurements of radiance and irradiance (Wuller and Gabele 2007).

The system consists of a reliable and inexpensive platform. An auto- mated data acquisition system. Advantageous for experimentalists.
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