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LDM-9811 light detector for radiation protection

Radiance is the quantity used for the determination of blue light hazard and retinal thermal hazard to the human eye measured in the radiometric unit of W/(m2*sr). For spot source configurations irradiance is generally measured.

Viewer Module for Radiance Measurements

LDM-9811 is a modularly designed viewer module that is combined with PD-16 series detectors to form the complete radiance detector. A one piece machined aluminum housing ensures the best possible stability in laboratory and field use. The LDM-9811/PD-16 features a wide aperture high light throughput focusing objective. The useable measurement distance of the LDM-98 spans from 0.3m to infinitive.

Selectable Field-of-View

A selector knob on the LDM-9811 rear panel enables the selection of the three field-of-views 1.7, 11 and 100mrad specified to measure the limit values for spot and large area sources in the Blue-light hazard regulations.

Viewfinder for Precise Alignment and Focusing

The targeted spot to be measured is visible through the ocular viewfinder. In combination with the cross-hair targeting aid alignment of the LDM-9811 to the zone of interest is simple. Focusing is achieved by adjusting the sharpness of the image on the viewfinder screen.

Three Hazard Spectral Responsivities

Gigahertz-Optik offers three exchangeable PD-16 type detectors for use on the LDM-9811 viewer module for the measurement of

  • Blue light hazard - Model PD-16BLH
  • Retinal Thermal Hazard - Model PD-16RTH
  • Retinal Thermal Hazard IR-A - Model PD-16-RTHA

Due to limitations in photodiode detector technology the longer wavelength responsivity of the retinal thermal detectors is limited to 1150nm instead of 1400nm as specified.

Traceable Calibration

Calibration is performed by the Gigahertz-Optik GmbH calibration laboratory for optical radiation measurements quantities. As with all light detectors supplied by Gigahertz-Optik calibration of absolute detector responsivity as well as detector individual measured relative spectral responsivity data is included.

LDM-9811_PD-16BLH - Typical Spectral Responsivity
LDM-9811_PD-16RTH Typical Spectral Responsivity
LDM-9811_PD-16RTHA Typical Spectral Responsivity
Specification
Version LDM-9811+PD-16BLH
Spectral Function

Blue-light Hazard 
Actinic

Typical Responsivity

1.7 mrad; 0.2 nA/W·m-2·sr-1
11 mrad; 5.7 nA/W·m-2·sr-1
100 mrad; 380 nA/W·m-2·sr-1

 

Imax

1 mA

Sensing Area Cosine Diffuser

50 mm Ø Cosine

Cable Length

2 m

Operation Temperatur

(5 - 40) °C

Plug Type

-1,-2,-4

Version LDM-9811+PD-16RTH
Spectral Function

Retinal
Actinic

Typical Responsivity

1.7 mrad; 0.3 nA/W·m-2·sr-1
11 mrad; 11 nA/W·m-2·sr-1
100 mrad; 780 nA/W·m-2·sr-1

Imax

1 mA

Sensing Area Cosine Diffuser

50 mm Ø Cosine

Cable Length

2 m

Operation Temperature

(5 - 40) °C

Plug Type

-1,-2,-4

Spectral Function

Retinal
Actinic

Typical Responsivity

1.7 mrad; 0.2 nA/W·m-2·sr-1
11 mrad; 5 nA/W·m-2·sr-1
100 mrad; 360 nA/W·m-2·sr-1

 

 

 

Imax

1 mA

Sensing Area Cosine Diffuser

50 mm Ø Cosine

Cable Length

2 m

Operation Temp.

(5 - 40) °C

Plug Type

-1,-2,-4

Spot Diameter
Distance / F.O.V. 100 mrad 11 mrad. 1.7 mrad
0.3 m 19.9 2.2 0.4
0.5 m 39.8 4.4 0.8
1 m 89,6 9.9 1.8
2 m 189.2 20.9 3.8
10 m 986 109 19.8
Miscellaneous
Max. signal current

1 mA

Type Description File-Type Download
Datasheet LDM-9811 PDF
Produktname Product Image Description Show product
P-9710 High-quality device for measurement of CW-, single pulse and modulated radiation.

Features: Optometer for all detector heads with calibration data plug. Measurement modes: CW, pulse energy, dose, peak-to-peak, effective luminous intensity (Blondel-Rey), data logger, battery, main power, RS232
Article-Nr Modell Description Request / Compare
Product
15296136 LDM-9811

Viewer Module

Measurement Head
15296146 PD-16-BLH (-1 Connector)

Detector, Calibration Certificate

15297014 PD-16-BLH (-2 Connector)

Detector, Calibration Certificate

15297015 PD-16-BLH (-4 Connector)

Detector, Calibration Certificate

15296147 PD-16-RTH (-1 Connector)

Detector, Calibration Certificate

15297006 PD-16-RTH (-2 Connector)

Detector, Calibration Certificate

15297017 PD-16-RTH (-4 Connector)

Detector, Calibration Certificate

15296148 PD-16-RTHA (-1 Connector)

Detector, Calibration Certificate

15297018 PD-16-RTHA (-2 Connector)

Detector, Calibration Certificate

15297019 PD-16-RTHA (-4 Connector)

Detector, Calibration Certificate

Re-calibration
15300580 K-Si-SR

Calibration of relative spectral responsivity from 250 nm to 1100 nm or within the detectors spectral response

15300445 K-LDM98_PD16BLH-I

Recalibration with Calibration Certificate

15300446 K-LDM98_PD16RTH-I

Recalibration with Calibration Certificate

15300444 K-LDM98_PD16RTHA-I

Recalibratin with Calibration Certificate

Accessories
15297654 LDM-98Z-ND1

Ocular filter ND1

15297655 LDM-98Z-ND2

Ocular filter ND2

15297656 LDM-98Z-ND3

Ocular filter ND3

15305646 LDM-98Z-ND4

Ocular filter ND4


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