ScienTECH 380401, 384UV5, 388UV5, 360401, 380402 Setup And Operating Procedures

100mm and 200mm
Calorimeters

Setup and Operating Procedures

PN11434C

Thank you for choosing a Scientech large aperture calorimeter. Scientech, an ISO 9001 registered company,
and our employees are pleased to provide you with a product designed for years of reliable service. Please read
this manual completely before using your calorimeter. This information will enable you to fully utilize the
equipment and should be located nearby for reference. The calorimeter is intended to be used only in the
manner outlined in this manual. Misuse of the equipment may cause product failure.

The words "calorimeter" and "detector" are synonymous as used in this manual.

Table of Contents:

Calorimeter Operating Parameters:............................................................................................................................2

Large Aperture Calorimeter Specifications: ..............................................................................................................3

CE Mark Certification: ..............................................................................................................................................3

Environmental Requirements: ...................................................................................................................................3

Unpacking and Set Up: ..............................................................................................................................................4

Cable Requirements:..................................................................................................................................................4

Calorimeter Operation Without an Indicator:............................................................................................................4

Operation of Large Aperture Calorimeters with a Digital Volt Meter: ..............................................................4

Operation of Large Aperture Calorimeters with an Analog Chart Recorder: ....................................................5

Calorimeter Response: ..............................................................................................................................5

Numerical Integration: ..............................................................................................................................5

Initial Voltage Interpolation:.....................................................................................................................6

Peak Voltage Estimate: .............................................................................................................................6

Calibration of Large Aperture Calorimeters:......................................................................................................6

Factory Recalibration:................................................................................................................................................7

Limited Warranty:......................................................................................................................................................7

Returned Goods Procedure: .......................................................................................................................................7

Disposal of Electrical and Electronic Equipment:.....................................................................................................8

CALORIMETER OPERATING PARAMETERS:

Calorimeter 1:
Model No: ___________
Serial No: ___________
Calibration Wavelength ___________nm
Output Sensitivity (S): ___________V/W
Time Constant (1/e): ___________sec.
Calibration Temp: ___________°C
Sub. Heater Resistance (Rc): ___________ohms

Sub. Heater Voltage (Vh): ___________volts

Sub. Heater Wattage (Wh) ___________watts

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LARGE APERTURE CALORIMETER SPECIFICATIONS:

Model
Type of Absorber Surface Volume Volume Volume Surface Volume* Volume Volume
Aperture Diameter 100mm 200mm
Minimum Beam Diameter

Spectral Response .25 - 35µm .266 - 1.2µm9 -11µm .193 - .36µm .25 - 35µm .266 - 1.2µm9 -11µm .193 - .36µm
Maximum Average Power 50W with full illumination of absorbing surface 100W with full illumination of absorbing surface
Minimum Average Power 150mW 700mW
Noise Level 1.5mJ - mW 7mJ - mW
Maximum Power Density 200W/cm² See Note 1 4W/cm² Note 2 200W/cm² See Note 3 4W/cm² Note 2
Maximum Peak Power Density 1MW/cm² See Note 4 100MW/cm² See Note 5 1MW/cm² See Note 6 100MW/cm² See Note 5
Maximum Single Pulse Energy

Maximum Energy Density Note 7 Note 8
Precision < 1%
Accuracy 5%
Response Time 5 sec when connected to a Scientech Indicator in Watts Mode
Dimensions DxL - inches/cm 6.00 x 8.00/15.24 x 20.32 9.00 x 10.00/22.86 x 25.40
Weight - pounds/kgs 6/2.72 16.27/7.26
Indicator Compatibility H410, H410D, S310, S310D
* This is a segmented absorber

Note 1: 380401

Note 2: 384UV5, 388UV5

Note 3: 380801

Note 4: 380401

Note 5: 384UV5, 388UV5

Note 6: 380801

Note 7: 360401, 360801
Note 8: 380401 Repetitive pulses:

Note 9: 384UV5, 388UV5

Note 10: 38-0801 Repetitive pulses:

360401 380401 380402 384UV5 360801 380801 380802 384UV5

5cm 7.5cm

150J 300J

27W/cm

50W/cm

13.5W/cm

90GW/cm

Repetitive pulses: 101MW/cm

Single pulses: 3.5GW/cm

45GW/cm

Max J/cm

3.7J/cm

Single pulses:

7J/cm

Repetitive pulses: 1.1J/cm

Single pulses: 40J/cm2 @ 355nm

1.85J/cm

Single pulses:

3.5J/cm

2

@ 1064 nm, 21W/cm2 @ 532 nm, 7.7W/cm2 @ 355 nm, 158mW/cm2 @ 266nm

2

@ 355nm

2

@ 1064 nm, 10.5W/cm2 @ 532 nm, 3.85W/cm2 @ 355 nm, 79mW/cm2 @ 266nm

2

@ 1064 nm, 71GW/cm2 @ 532 nm, 27GW/cm2 @ 355 nm, 530MW/cm2 @ 266nm

2

2

@ 1064 nm, 35.5GW/cm2 @ 532 nm, 13.5GW/cm2 @ 355 nm, 265MW/cm2 @ 266nm

2

= 1000 x (pulse width)

2

@ 1064nm, 2.9J/cm2 @ 532nm, 1J/cm2 @ 355nm, 20mJ/cm2 @ 266nm

2

@ 1064nm, 5.6J/cm2 @ 532nm, 2.1J/cm2 @ 355nm, 41mJ/cm2 @ 266nm

2

@ 1064nm, 1.45J/cm2 @ 532nm, 0.5J/cm2 @ 355nm, 10mJ/cm2 @ 266nm

2

@ 1064nm, 2.8J/cm2 @ 532nm, 1.05J/cm2 @ 355nm, 20.5mJ/cm2 @ 266nm

@ 355nm

2

@ 355nm

2

4J/cm

2

@ 355nm

1/2

to a maximum of 200J/cm

Note 9 Note 7 Note 10

2

4J/cm

2

Note 9

CE MARK CERTIFICATION:

All of the calorimeters listed in this manual have been certified for the European CE mark.

ENVIRONMENTAL REQUIREMENTS:

This product is intended for indoor use at altitudes up to 2000 meters, Pollution Degree 2 in accordance with
IEC 664 and transient overvoltages according to Installation Categories (Overvoltage Categories) II. Note that
each of the above detectors will not pass the IEC 801 Publication, Part 3, Radiated Electromagnetic Field
Requirements. The system, meter and detector, is designed to measure radiation within the test's radiation band.
The detectors were held outside the radiated electromagnetic field during this test. It is up to the user to be
aware of RF fields present during measurements and their effects if any on those measurements.

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UNPACKING AND SET UP:

The calorimeter and accessories are shipped in custom packing materials. All packing materials should be
saved for future damage free shipments.

A ¾” diameter mounting post is included. Screw the post into the mounting hole in the body of the calorimeter.
Mount the post to your optical bench or working surface.

If you are using a Scientech indicator, connect the calorimeter to the interface module and the interface module
to the indicator. Follow the detailed set up instructions that are in the indicator’s instruction manual. If you are
not using a Scientech indicator operating requirements are contained in this manual.

Note: Large aperture calorimeters are sensitive to all types of thermal input. Due to the handling of the

calorimeter during setup and possible environmental temperature differences, thermal gradients
may exist in the calorimeter. Allow the calorimeter to sit undisturbed for several minutes to,
reach thermal equilibrium, before using.

CABLE REQUIREMENTS:

Refer to Figure 1. The output of the calorimeter is connected directly to the DVM or chart recorder. Large
aperture calorimeters do not require any power. The voltage output is on pin 1 of the DIN connector and should
be connected to the positive side of the DVM or chart recorder. Ground is on pin 3 and should be connected to
the negative side. Pin 2 is not used.

Figure 1 – 100mm and 200mm connectors

CALORIMETER OPERATION WITHOUT AN INDICATOR:

Note: Whenever a large aperture calorimeter is used without an indicator the interface module,

which is required to connect the calorimeter to the indicator, is not used.

Operation of Large Aperture Calorimeters with a Digital Volt Meter:

The calorimeters may be used with any digital volt meter (DVM) capable of reading 5 volts full scale.

A. Refer to Figure 1. Connect the output of the calorimeter to the DVM.
B. Select the DC volts mode.
C. Direct the laser beam on to the absorbing surface of the calorimeter.
D. When the display of the DVM has stabilized (about 2 minutes), calculate the laser power using the

formula: W = V/S

where:
W = Laser power in watts
V = Voltage reading of the DVM in volts
S = Sensitivity of the calorimeter from page 2.

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Operation of Large Aperture Calorimeters with an Analog Chart Recorder:

Calorimeter Response:

The response of a calorimeter to a single pulse input as displayed by a chart recorder appears below.

The output voltage from a chart recorder can be converted to wattage at any time by:

W = V/S, Wi = Vi/S

V = Chart recorder voltage level in mV
S = Calorimeter sensitivity in mV/W

The total energy (E) in the pulse can be found by integrating the instantaneous wattage over time:

E = ∫ W(t) dt

The following methods may be used to compute the total integrated energy:

∞

0

Numerical Integration:

Finding the area under the curve in figure 7 is the equivalent procedure for determining pulse energy. Choose an
appropriate time interval, dt, and perform the summation:
N N
E = ∑ W

xdt = (dt/S)∑ Vi

i

I=1 i=1

The error caused by this procedure is:
N
dE = (dt/S) Σ dVi
i=1

The error, in theory, is only dependent upon the value of ∑dVi, that is the cumulative random error of Vi. This
number should approach zero if data is carefully taken. The accuracy is also increased if the time interval, dt, is
minimized. Numerical integration can yield accurate results, but is a tedious task.

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Initial Voltage Interpolation:

A method used to eliminate the tedious numerical integration task is to project the thermal decay envelope on to
the voltage axis, determine the 1/e decay time constant T, and estimate the total energy value (E):
E = (Vo/S) x T
The change from thermal absorption to thermal transport phenomena near the peak causes difficulty in
accurately projecting the envelope on to the voltage axis introducing an error, dVo. Further, the determination of
the time constant T, introduces another error, dT. The total error is the sum of the two errors.
dE = (Vo/S)dT + (T/S)dVo
The difficulty in eliminating the potential error makes this method typically less accurate than numerical
integration, but much faster in application.

Peak Voltage Estimate:

The peak voltage method requires using an independent determination of total energy and referencing it back to
the peak voltage value, V

.

p

For a given pulse, use the numerical integration method to obtain E. Note the peak voltage, V

. Compute the

p

value, F
F = E/Vp

For the next pulse compute the total energy: E = F x Vp

The error in using this method yields: dE = FdVp + VpdF

The accuracy of this measurement depends upon the error in the original calibration, dF, and the error in the
peak voltage dVp. A careful numerical integration yields a value for dF near zero. The value of dVp can be
minimized by maintaining the geometry of the system (i.e. beam intensity, beam profile, wavelength and
environment) during operation to be the same as during calibration. Under controlled circumstances, the peak
method accuracy usually falls between the numerical integration and initial voltage interpolation methods.

Calibration of Large Aperture Calorimeters:

A. Refer to Figure 1. Connect a DVM to the white jacks of the calorimeter.
B. Measure the resistance of the substitution heater making sure to subtract the resistance of the patch

cables from the total resistance measurement.

Note: When measuring the substitution heater resistance of a 200 mm calorimeter, R1 and R2

must be connected together in series.

Compare this resistance to Rc in the calibration data in the front of the manual. The two should agree

within 2%. If not, contact Scientech.

C. Calculate the voltage equivalent to laser power using the following formula:

V = (Rc x C x W)
where:
V = voltage applied to the heater coil
R

= substitution heater resistance from step B

c

C = Cal coefficient 360401 = 1.018 360801 = 1.000
380401 = 0.974 380801 = 1.008
380402 = 1.024 380802 = 1.008
384UV5 = 1.021 388UV5 = 1.002
W = desired laser power in watts

D. Connect the DVM to the calorimeter’s DIN connector.
E. Apply the calculated voltage (V) to the electrical substitution heater.

1/2

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F. Record the voltage reading of the DVM (Vc).
G. Calculate the calorimeter’s output sensitivity (S) as follows:

S = Vc/W
where:
S = calorimeter’s output sensitivity
V
W = desired laser power output.

The measured sensitivity should be ± 3 % of the calorimeters original sensitivity value.

= voltage output from the calorimeter in mV

c

FACTORY RECALIBRATION:

Scientech recommends that a complete calibration be performed annually to verify system accuracy. Please
contact our Product Service Department at [phone] or [phone] or Fax [phone] or email
[e-mail] to arrange for a NIST traceable, factory calibration.

LIMITED WARRANTY:

All Scientech Laser Power and Energy Measurement Systems are warranted against defects in materials and
workmanship for two (2) years from date of delivery. During the warranty period, Scientech will repair, or at its
option replace at no charge, components that prove to be defective. The equipment must be returned, shipping
prepaid, to Scientech's product service facility. This limited warranty does not apply if the equipment is
damaged by accident or misuse or as a result of service or modification by other than a Scientech service
facility. The foregoing warranty is in lieu of all other warranties expressed or implied including but not limited
to any implied warranty of merchantability, fitness, or adequacy for any special incidental or consequential
damages whether in contract, tort, or otherwise.

RETURNED GOODS PROCEDURE:

Should it become necessary to return any item to Scientech for any reason, please contact our Product Service
Department at [phone] or [phone] or Fax [phone] or email [e-mail]. When
you call, please be ready to provide model number, serial number, and a description of the problem. Frequently
we can provide self-help information which will eliminate the need for returning the unit(s).

If equipment return is required, please pack the items in the original box and packing material. As an alternate,
place the equipment in a snug-fitting box, and then pack that box in a larger box with at least four inches of
packing material. Scientech does not assume responsibility for under packed items.

Please include the name and phone number of the person we should contact regarding repair questions.

Normally, products are repaired and shipped within 5 working days after their arrival at the product service
facility. This is an average time and could vary depending on the workload.

Shipping Address:

Scientech, Inc.
Product Service Department
5649 Arapahoe Ave.
Boulder, Colorado 80303
U.S.A.

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DISPOSAL OF ELECTRICAL AND ELECTRONIC EQUIPMENT:

Scientech, Inc. recommends the following for disposal of electrical and electronic equipment:

1. The best option is to reuse the equipment in its entirety.

2. Where the equipment can not be reused in its entirety, priority should be given to reuse of its
subassemblies and components.

3. Where reuse is not appropriate, electrical and electronic equipment, including batteries, should be
recycled according to local ordinances. It should never be mixed with municipal waste.

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