Delta OHM HD2402 User manual

Our instruments’ quality level is the results of the continuous development of our

products. This can cause differences between the information written in this manual

and the instrument that you have purchased. We cannot totally exclude errors in the

manual, for which we apologize.

The data, figures and descriptions contained in this manual cannot be legally asserted.

We reserve the right to make changes and corrections without prior notice.

REV. 1.1

29/11/2010

HD2402

Photo-Radiometer / Dosimeter

for non-coherent artificial optical

radiations (A.O.R.) measurement

ENGLISH

- 2 -

HD2402

Photo-Radiometer / A.O.R. Dosimeter

- 3 -

FRONT

1. LASER LED

2. Radiometric sensor for the measurement of UV band (220÷400 nm)

3. Radiometric sensor for the measurement of NIR band (700÷1300 nm)

4. Not used

5. Radiometric sensor for the measurement of UVA band (315÷400 nm)

6. Photometric sensor for the measurement of visible radiation (Luxmeter)

7. Radiometric sensor for the measurement of BLUE band (400÷600 nm)

8. Not used

9. Thermopile sensor for the measurement of NIR-FIR band (400÷2800 nm)

BACK AND SIDE

10. Push-button for the LASER diode pointer activation and for the instrument

control when this is not connected to a PC

11. LED indicator: displays the instrument status

12. Handle

13. M12 connector for the instrument connection to a PC or to a power supply unit

14. Tripod

15. Connection for fixing the instrument to the tripod

ATTENTION !

WHEN SWITCHING ON THE LASER, DO NOT EXPOSE EYES

OR SKIN TO THE LASER DIRECT RADIATION.

WHEN THE LASER IS SWITCHED ON, MAKE SURE THAT

NO ONE CROSSES INADVERTEDLY THE LASER BEAM

- 4 -

TABLE OF CONTENTS

1INTRODUCTION ....................................................................................... 5

2RADIOMETRY OVEROBSERVATION........................................................... 8

2.1 Irradiance ...........................................................................................8

2.2 Radiance.............................................................................................9

3OPERATING PRINCIPLE ......................................................................... 11

4INSTRUMENT INSTALLATION................................................................. 15

4.1 Connection to a PC ............................................................................. 15

5DESCRIPTION OF OPERATION ............................................................... 16

6MANAGEMENT OF A MEASUREMENT CAMPAIGN WITH DELTALOG13...... 18

6.1 Setting measurement scales ................................................................18

6.2 Logging mode.................................................................................... 19

6.3 Downloading measurement stored in the PC .......................................... 20

6.4 Data analysis and evaluation report ...................................................... 21

6.4.1 Geometric parameters...............................................................25

6.4.2 Luxmeter table......................................................................... 26

6.4.3 a. 180-400 table ...................................................................... 27

6.4.4 b. 315-400 table ......................................................................27

6.4.5 c.d. 300-700 table .................................................................... 28

6.4.6 g.h.i. 380-1400 table ................................................................ 33

6.4.7 j.k.l. 780-1400 table ................................................................. 38

6.4.8 m.n.o. 380-3000 table .............................................................. 43

6.4.9 Notes table.............................................................................. 44

6.4.10 Report table ............................................................................ 44

7SPECTRUM FEATURES ............................................................................ 46

7.1 Spectral interval 180-400nm ............................................................... 46

7.2 Spectral interval 315-400nm (UVA) ...................................................... 47

7.3 Spectral interval 300-700nm ............................................................... 47

7.4 Spectral interval 380-1400nm.............................................................. 48

7.5 Spectral interval 780-1400nm.............................................................. 48

7.6 Spectral interval 380-3000nm.............................................................. 49

8SENSOR CALIBRATION .......................................................................... 50

9TECHNICAL SPECIFICATIONS ................................................................ 51

10 STORAGE ............................................................................................... 53

11 SAFETY INSTRUCTIONS ......................................................................... 53

12 ORDER CODES........................................................................................ 54

- 5 -

1INTRODUCTION

HD2402 is a portable datalogger photo-radiometer for the measurement of non-

coherent optical radiations in accordance with 2006/25/CE European direc-

tive and legislative decree No 81 of 9 April 2008.

The instrument consists of a series of sensors used to cover the different portions of

the spectrum and of a small LASER used to point the analyzed source.

The different sensors operate in the following spectral ranges:

•Photometric sensor for the measurement of illuminance (luxmeter) in the spec-

tral range 380÷780 nm.

•Radiometric sensor for UV band (220÷400 nm) with spectral weight factor S(λ).

•Radiometric sensor for UVA band (315÷400 nm).

•Radiometric sensor for 400÷700 nm (blue) band with spectral weight factor

B(λ).

•Radiometric sensor for IR band (700÷1300 nm) with spectral weight factor

R(λ).

•Thermopile sensor for the measurement of infrared radiance, 400÷2800 nm

spectral range.

HD2402 unit can be powered through connection to the USB port of a PC, or through

an external power supply unit provided with an USB port (SWD05 code). The CP24

connection cable is provided with a M12 connector on the instrument side and with an

A-type USB connector on the PC side or on the SWD05 power supply unit side.

HD2402 can be configured (calendar, date, time, start time and logging time) by

means of DeltaLog13 software, from 1.0.1.0 version, and a PC; additionally,

stored data can be downloaded and analyzed and new data can be acquired in real

time. Once configured, the datalogger can be disconnected from the PC and connected

to the power supply unit for data acquisition and storage according to the pro-

grammed settings.

The unit is provided with a button for data storage manual start/stop when the unit is

not connected to a PC.

A LED indicator on the back of the unit shows the instrument’s acquisition state.

The legislative decree No 81/08, paragraph 5, establishes the measurement of artifi-

cial optical radiations (AOR) produced by incoherent light and coherent light (LASER).

HD2402 unit can perform characterization of incoherent sources and in this manual,

unless otherwise specified, reference will be made only to this kind of sources.

Attachment No 37 of L.D. 81/08 provides the formulas (Table 1) to determine the bio-

physically-relevant limit values of exposure to optical radiations.

- 6 -

(a)

eff

H=∫∫

=λ nm400

=λ nm180

tdd)(S)t,(E ...

λλλ

eff

is only relevant in the range 180 to 400 nm)

(b)

UVA

λ = 400 nm

λ = 315 nm

(λ, t) .dλ.dt

∫∫

UVA

is only relevant in the range 315 to 400 nm)

(c), (d)

= L

(λ) .B(λ) .dλ

λ= 700 nm

λ= 300 nm

∫

is only relevant in the range 300 to 700 nm)

(e), (f)

∫

700 nm

d)λ(B)λ

λ(E

=λ

= 300 nmλ

is only relevant in the range 300 to 700 nm)

(g) to (l)

= L

(λ)

∫

(λ)

(See Table 1.1 for appropriate values of λ

and λ

)

(m), (n)

∫⋅=

=λ

nm3000

nm780

dλ)(λEE

is only relevant in the range 780 to 3 000 nm)

(o)

∫∫ ⋅⋅=

=λ

nm3000

nm380

skin

dtdλ)t,(λEH

skin

is only relevant in the range 380 to 3 000 nm)

Table 1: formulas for the calculation of limit values

Where :

Eλ(λ,t),

Eλ

Spectral irradiance or spectral power density: the radiant power incident per

unit area upon a surface, expressed in watts per square meter per nanome-

ter [W/(m2nm)]; El(λ,t) and Eλvalues come from measurements or can be

supplied by the manufacturer of the equipment;

Eeff Effective irradiance: calculated irradiance within the UV wavelength range

180 to 400 nm, spectrally weighted by S (λ),

expressed in watts per square

meter [W/m2];

H Radiant exposure: the time integral of the irradiance, expressed in joule per

square meter [J/m2];

Heff Effective radiant exposure: spectral weighting by S (λ) radiant exposure,

expressed in joule per square meter [J/m2];

EUVA Total irradiance (UVA): calculated irradiance within the UVA wavelength

range 315 to 400 nm, expressed in watts per square meter [W/m2];

HUVA Radiant exposure: the time and wavelength integral

or sum of the irradiance

within the UVA wavelength range 315 to 400 nm, expressed in joule per

square meter [J/m2];

S (λ) Spectral weighting taking into account the wavelength dependence of the

health effects of UV radiation on eye and skin [dimensionless];

t, Δt Time, duration of the exposure, expressed in seconds [s];

λWavelength, expressed in nanometers [nm];

Δλ Bandwidth, expressed in nanometers [nm], of calculation or measurement

intervals;

Lλ(λ),

Lλ

Spectral radiance of the source, expressed in watts per square meter per

steradian per nanometer [W/(m2sr nm)];

- 7 -

R (λ) Spectral weighting taking into account the wavelength dependence of the

thermal injury caused to the eye by visible and IRA radiation [dimen-

sionless];

LREffective radiance (thermal injury): calculated radiance spectrally weighted

by R(λ), expressed in watts per square meter per steradian per nanometer

[W/(m2sr)];

B (λ) Spectral weighting taking into account the wavelength dependence of the

photochemical injury caused to the eye by the blue light radiation [dimen-

sionless];

LBEffective radiance (blue light): calculated radiance spectrally weighted by B

(λ), expressed in watts per square meter per steradian [W/(m2sr)];

EBEffective irradiance (blue light): calculated irradiance spectrally weighted by

B (λ), expressed in watts per square meter [W/m2];

EIR Total irradiance (thermal injury): calculated irradiance within the infrared

wavelength range 780 nm to 3 000 nm, expressed in watts per square me-

ter [W/m2];

Eskin Total irradiance (visible, IRA and IRB): calculated irradiance within the visi-

ble and infrared wavelength range 380 nm to 3 000 nm, expressed in watts

per square meter [W/m2];

Hskin Radiant exposure, the time and wavelength integral or sum of the irradiance

within the visible and infrared wavelength range 380 nm to 3 000 nm, ex-

pressed in joule per square meter [J/m2];

αAngular subtense: the angle subtended by an apparent source, as observed

at a point in space, expressed in milliradians (mrad).

Apparent source in the

real or virtual object that forms the smallest possible retinal image.

Limits depend on the wavelengths of the analyzed light and on the kind of injury to be

taken into consideration.

Also the physical quantities of interest (irradiance [W/m2], radiance [W/(m2sr)]) differ

depending on the kind of injury to be taken into consideration.

- 8 -

2RADIOMETRY OVERVIEW

The foregoing exposition is far from being exhaustive, but will be useful to make the

HD2402 unit operation known and to understand the approximations made by the in-

strument for the calculation of the various radiometric quantities requested by L.D. No

81/08.

2.1 IRRADIANCE

Irradiance Ei at a point of a surface is defined as the density of energetic flux d

I that

flows through the unit area dA (Figure 1):



Figure 1: irradiance

The irradiance measurement unit is [W/m2]; when calculated at different wavelengths,

we have spectral irradiance [W/(m2 nm)].

From the definition of irradiance we obtain some properties useful for understanding

the light behavior:

1. We have maximum irradiance on a surface when the incident light beam is per-

pendicular to the surface and decreases with the incident angle according to the

cosine formula (Law of Cosine):

)cos(

⋅

where:

Eiis the irradiance on the surface taken into consideration,

Ei—0 is the irradiance when the surface is perpendicular to the flux,

θis the angle between the surface and the flux direction.

2. As to a point light source (or to be considered as such) that radiates light uni-

formly in all directions (isotrope), the irradiance produced on a surface decreases

with the square of the distance.

- 9 -

2.2 RADIANCE

Radiance L

iat a point of a surface is defined as the energetic flux d2ΦI that flows

through a surface dA per unit solid angle dΩ(Figure 2):

⋅

=ddA

Figure 2: radiance

The radiance measurement unit is [W/(m2sr)]; when calculated at different wave-

lengths, we obtain the spectral radiance [W/(m2nm sr)].

A solid angle is the angle subtended at a point Pby a closed surface A. It is calculated

as the relation between the surface projected on a sphere of radius R with center in P

and R2. The measurement unit of a solid angle is the steradian [sr] and its value

ranges between 0 and 4π.

Radiance and irradiance are two different quantities. Radiance describes the angular

distribution of radiation while irradiance integrates radiance in all directions. The pri-

mary relation linking irradiance to radiance is:

(

)

ωθφθ

dLE ii )cos(,

∫

⋅=

If radiance is uniform, then the term L(θ,φ) can be taken out from the integral and the

expression is simplified as follows:

FLdE i

iL⋅== ∫

ωθ

)cos(

Where F depends only on geometry.

In these particular conditions, the radiance value can be obtained from that of the ir-

radiance: hence, the formula will be:

Remark: for small angles, F is actually the solid angle under which the observer

source is seen.

By using this reduction, HD2402 unit allows to calculate the radiance of the irradiance

measured values.

- 10 -

Similar definitions apply to photometry where irradiance will be replaced by illumi-

nance (lux) and radiance by luminance [cd/m2].

More generally, the link between any spectral radiometric quantity GR(

)and the cor-

responding photometric quantity GF is given by the following formula:

∫⋅⋅=

780

380

)()(683

λλλ

dVGRGF

where :

V(λ) is the photopic vision curve (Figure 3), 380nm and 780nm are the integration ex-

tremes, out of these extremes V(λ)=0.

Figure 3: luminous efficacy curve for the photopic vision

The photopic vision curve represents the luminous efficacy of the human eye under

daylight conditions (in lowlight conditions, the response curve of the human eye

changes, and we talk about a scotopic vision).

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