Optics for Sensors and Detectors

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Sensors as well as varios systems on their base are widly used and discover new and new areas for applciations on almost all aspects of human activity. Optical IR-sensors and detectors belong to a special niche since are allowed to control and manage the processes which take place at room and much low temperatures. Majority of the devices here are remote-acting and non-contact.

Application of Wien's law to human body emission results in a peak wavelength of

For this reason, thermal imaging devices for human subjects are most sensitive in the 7‑14um range. For monitoring and temperature measurements of higher heated environments the wavelength range 3-5um is used.

Practically all organic and inorganic compounds have the unique feature that they more or less good absorb at the diapason of  2‑15um. This cause the wide products line of IR-sensors and IR-detectors.

Tydex introduces various passive optics for the discussed topic. Hereunder are some examples of the optical elements demonstrating the range of our products:
1. Silicon meniscus lenses for 3-5 um IR detectors (pyrometers)
2. Germanium windows for 8-12 um IR imagers
3. Germanium meniscus lenses for 8-10 um IR imagers
4. Protective domes for pyranometers
5. Filters for pyrgeometers
6. Sapphire windows for under-water sensors
7. Silicon bullet-lenses for 3-5 um IR immersion LED's and photodiodes
8. CaF₂ bullet-lenses for 3-5 um IR immersion LED's and photodiodes
9. ZnSe lenses for 10.6 um lasers 
10. ZnSe  beamsplitters
11. ZnSe windows for IR detectors, etc. 
12. Teflon IR polarizers

Additional information is available at  Frontal Optics for Ultimate Applications.

1. Si meniscus lenses for 3-5 um IR detectors (pyrometers)

Application: production of concrete, steel, glasses, etc.


Specification:

Material	Si
Type	meniscus lens, plano-convex lens
Diameter, mm	29 (+0/-0.2)
Central thickness, mm	4 (+/-0.2)
EFL tolerance, %	+/-2
Surface quality, scr/dig	60/40
Surface figure, fringes	N<=5, deltaN<=1 @633nm
AR coating (BBAR/BBAR type), R @3-5 um, %	<1 (see the curve below)

Fig. 1. Transmission spectra of Si meniscus lens.

2. Ge window for 8-12 um IR imager

Application: to be installed at helicopter for long-distanse monitoring of forest fire


Specification:

Material	Ge
Type	plano-plano window
Diameter, mm	120 (+0/-0.2)
Thickness, mm	4 (+/-0.2)
Surface quality, scr/dig	60/40
Surface figure, fringes	N<=5, delta N<=1 @633nm
AR coating (DLC/BBAR type), R @8-12um, %	<5 (see the curve below)

Fig. 2. Transmission spectra of Germanium windows for 8-12 um IR imager.

3. Ge meniscus lenses for 8-10 um IR imagers

Application: sea-based system of 360 deg.-panoramic view


Specification:

Material	Ge
Type	meniscus lens
Diameter, mm	105 (+0/-0.2)
Central thickness, mm	8 (+/-0.2)
EFL tolerance, %	+/-2
Surface quality, scr/dig	60/40
Surface figure, fringes	N<=5, delta N<=1 @633nm
AR coating (DLC/BBAR type), R @8-10 um, %	<5 (see the curve below)

Fig. 3. Transmission spectra of Germanium meniscus lenses for 8-10 um IR imager.

4. Protective dome for pyranometer

Application: meteorology, climatology, environmental monitoring at green-houses and open fields



Specification:

Material	Glass, quarts
Type	dome
Diameter, mm	32 (+0/-0.2)
Central thickness, mm	3.7 (+/-0.2)
Surface quality, scr/dig	80/50

5. Filter for Pyrgeometer

Application: measuring an effective atmospheric IR radiation spectrum over wide spectral range (4.5-45 um)



Specification:

Material	FZ-Si
Type	plano-plano window, meniscus lens
Diameter, mm	31.8  (+0/-0.2)
Thickness, mm	1 (+/-0.1)
Surface quality, scr/dig	40/20
Operating temperature range	-40 C ...+80 C
Humidity	up to 90-95%
AR coating (DLC/solar blind type)	(see the curve below)

Fig. 6. Transmission spectra of filter for pyrgeometers.

6. Sapphire window for under-water sensor

Application - to be installed at bathyscaphe to monitor continental shelf, ship's bottom, etc



Specification:

Material	Sapphire
Type	plano-plano window
Diameter, mm	77 (+0/-0.2)
Thickness, mm	6.0 (+/-0.2)
Surface quality, scr/dig	60/40
Surface figure, fringes	N<=5, delta  N<=1 @633nm

7. Si bullet-lens for 3-5 um IR immersion LED's and photodiode

Application: to be used as lighter emitter

Specification:

Material	Si
Type	bullet-lens
Diameter, mm	3.5  (+0/-0.4)
Central thickness, mm	3.21  (+/-0.05)
Surface quality, scr/dig	40/20
Surface figure, fringes	N<=5, delta N<=1 @633nm
AR coating (one side BBAR @3-5 um)	(see the curve below)

Fig. 8. Transmission spectra of Si bullet-lens for 3-5 um IR immersion LED's and photodiodes.

8. CaF₂ bullet-lens for 3-5 um IR immersion LED's and photodiode

Application: environmental monitoring



Specification:

Material	CaF2
Type	bi-convex lens
Diameter, mm	11 (+0/-0.1)
Central thickness, mm	5.3 (+/-0.2)
EFL @4.25um, mm	12.5
Surface quality, scr/dig	80/50
Surface figure, fringes	N<=2, delta  N<=1 @633nm

9. ZnSe lens for 10.6 um laser

Application: laser industry, CO₂- and CO-detectors, medicine


Specification:

Material	CVD-ZnSe
Type	plano-convex lens
Diameter, mm	12.7 (+0/-0.2)
Central thickness, mm	2.0  (+/-0.2)
EFL tolerance, %	+/-2
Surface quality, scr/dig	40/20
Surface figure, fringes	N<=1, delta N<=0.5 @633nm
AR coating (AR/AR type), R @10.6 um, %	<0.5 (see the curve below)

Fig. 10. Transmission spectra of ZnSe lens for 10.6 um laser.

10. ZnSe beamsplitter

Application: monitoring of air quality, nitrogen fixation, fruit storage, mycology, medicine



Specification:

Material	CVD-ZnSe
Type	plano-plano window
Diameter, mm	25 (+0/-0.2)
Thickness, mm	4 (+/-0.2)
Surface quality, scr/dig	40/20
Surface figure, fringes	N<=5, delta  N<=1 @633nm
Coating	(see the curve below)
-S1: AR @10.3 um
-S2: R=90%+/-5% @10.3um

Fig. 11. Transmission spectra of ZnSe lens beamsplitter.

11. ZnSe window for IR detector, etc.

Application: monitoring of air quality, nitrogen fixation, fruit storage, mycology, medicine.



Specification:

Material	CVD-ZnSe
Type	plano-plano window
Diameter, mm	12.7 (+0/-0.2)
Thickness, mm	3.0  (+/-0.2)
Surface quality, scr/dig	60/40
Surface figure, fringes	N<=1, deltaN<=0.5 @633nm
AR coating (AR/AR type), R @ 4.5um, %	(see the curve below)

Fig. 12. Transmission spectra of ZnSe window for IR detectors . 

12. Teflon IR polarizer

Application: methane leak detectors


Specification:

Material	Teflon
Diameter, mm	12.7 (+0/-0.2)
Transmission curve	See the chapter IR Polarizers

We are pleased to emphasize that the list of similar components is permanently replenished and we are ready to considerate yuor new RFQ's.

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