Overview

The IR-60 range of broadband infra red lamps is based around a very low thermal mass diamond-like carbon thin film element. Due to the low thermal mass, the infra red lamp can be pulsed at frequencies up to 70+Hz with good modulation depth, or contrast between the on and off states. The IR-60 series is the perfect solution for an application that requires fast electrical modulation. However, it can also be used in a steady state (dc) mode. In applications where steady state power is used (or if used with electrical modulation but with a duty cycle of greater than 50%), it is recommended that the nominal input
power specifications be reduced in order to avoid overheating of the membrane.

This new lamp has an active area of approximately 2.2 mm² and is supplied in a TO-5 style package. The normal working range is 500° to 750° C with peak short term heating up to 850° C possible. Calculated lifetime is more than four years at 600°C.

Three families of parts are available in this range though both use the same element as the emitting infra red lamp.

Please note that over driving or contact with the thin film will cause these devices to fail.

IR-60

Standard IR-60 giving a wide output beam.

Ordering Information

IR-65

The IR-65 utilizes a collimated Optic to provide more than 12x the on-axis output. The package is 0.5 inches in diameter and 0.65 inches long. FWHM (full width at half max) for the IR-65 is 15°.

Ordering Information

IR-66

As per the IR-65 but has just 36% of the IR-
65 size. The package is 0.40 inches in diameter and 0.36 inches long. And yet it delivers 50% to 75% of the IR-65 on-axis output energy. FWHM (full width at half max) for the IR-66 is 20°.

Ordering Information

Operating Specifications

IR-60, IR-65 and IR-66

	Drive Voltage at 750°C:	6.7 +/- 0.4 Volts (AC or DC)
	Temperature:	450°C to 750°C
	Resistance in the Hot state*:	45 ohms (nominal) in hot state
	Current at 750°C:	149 mA
	Power input at 750°C:	1.0 Watts
	Spectral Range	1 to 20 microns
	Emissivity	0.8 (in the range of 2 to 14 microns)
	Modulation Depth:	50% at 70 Hz, 25% Duty Cycle
	Active area:	2.2 mm x 2.2 mm
	Lifetime:	100,000h at 450°C; 40,000h at 600°C; 5,000h at 750°C of operation (10 hertz at 50% duty cycle)
	Output 25-30% greater than the IR-50 (See Spectral Emission Chart)

Operating Guidelines

IR-6x Series utilizes a thin thermoresistive film of conducting amorphous (diamond-like) carbon. Infrared radiation is the result of heating this film by passing an electric current through it.

The maximum temperature of the film should not exceed 750°C in continuous operation. A faint red luminescence of the film is observed during operation at temperatures near 750°C. Short term heating up to 850°C is possible but will reduce the lifetime of the unit.

The operating parameters assume an infrared source operating without a radiator and at ambient temperature and pressure. A rectangular voltage pulsed at a frequency of 10 hertz and with a duty cycle of 50% is used for heating.

Two power leads and a ground are provided per the sketch below. The IR-60 emitter is to be powered through the two power leads. Bi-polar drive voltage may be used. The Case Ground Lead is not required under normal operation.

IR-6x Series is the perfect solution for an application that requires fast electrical modulation. However, it can also be used in a steady state (dc) mode. In applications where steady state power is used (or if used with electrical modulation but with a duty cycle of greater than 50%), it is recommended that the nominal input power specifications be reduced in order to avoid overheating of the membrane.

On the other hand, by reducing the length of the heating pulse or by increasing the frequency of modulation, the membrane will not have sufficient time to reach the desired temperature. In this case, the pulsed power can be increased to allow the temperature to be maintained. The chart below shows the factor by which the voltage can be increased as frequency is increased. This chart reflects a 50% duty cycle.

Useful Documents

Infra Red Source Series 60 Data Sheet - pdf (161K)