# Field of View Calculator

> Calculates infrared radiometer field of view based on height, angle, and sensor model. (iPhone/iPad app by Apogee Instruments.)

- Source: https://appshunter.io/ios/app/field-of-view-calculator/id955609110 (this page in markdown: same URL + `.md`)
- Developer: [Apogee Instruments](https://appshunter.io/developer/955609109)
- Category: Business, Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 9 MB
- Languages: American English
- Released: 2015-04-04
- Data updated: 2026-06-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/field-of-view-calculator/id955609110/reviews.md

## What is Field of View Calculator?

One of the most important steps in using an infrared radiometer from Apogee instruments is determining the exact field of view of the sensor during installation. The mounting geometry (distance from target surface, angle of orientation relative to target surface) is determined by the desired area of surface to be measured. The field of view extends unbroken from the sensor to the target surface. Sensors must be carefully mounted in order to view the desired target and avoid including unwanted surfaces/objects in the field of view, thereby averaging unwanted temperatures with the target temperature.

The FOV Calculator makes this process simple. To use the calculator, simply enter your IRR viewing height (H), viewing angle (θ, relative to nadir view = 0°), chose your sensor model, then click calculate.

General Information: All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensity of radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies, water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 µm).

Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperature without touching the surface (when using sensors that must be in contact with the surface, it can be difficult to maintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infrared thermometers because temperature is the desired quantity, even though the sensors detect radiation.

Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant water status estimation, road surface temperature measurement for determination of icing conditions, and terrestrial surface (soil, vegetation, water, snow) temperature measurement in energy balance studies.

Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precision thermistor (for detector reference temperature measurement), and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers also come with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation. The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of the radiometer closer to the target temperature. 

Sensors are potted solid with no internal air space and are designed for continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100 series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target (surface or object the sensor is pointed at) and detector, where the radiation balance between target and detector is related to the temperature difference between the two.

## Key features

- Calculate field of view
- Input viewing height
- Input viewing angle
- Select sensor model
- Supports Apogee Instruments sensors
- Simplifies installation

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/field-of-view-calculator/id955609110/reviews.md

### 5/5 — Very useful thanks

*2020-04-08*

Very useful apps that short cut the calculation

## Frequently asked questions about Field of View Calculator

### How do I use Field of View Calculator?

To use Field of View Calculator, simply enter your IRR viewing height (H) and viewing angle (θ, relative to nadir view = 0°). Then, choose your sensor model and click calculate to determine the field of view.

### What sensor models does Field of View Calculator support?

Field of View Calculator supports Apogee Instruments SI series infrared radiometers. You select your specific sensor model from a list within the app.

### What is the purpose of calculating the field of view?

Determining the exact field of view is crucial for infrared radiometer installation to ensure accurate surface temperature measurements by avoiding unwanted objects or surfaces.

### What are the typical applications for infrared radiometers?

Typical applications include plant canopy temperature measurement for water status estimation, road surface temperature for icing conditions, and terrestrial surface temperature for energy balance studies.

### Is Field of View Calculator available on Android?

Field of View Calculator is available for iPhone, iPad, and iPod. The provided data does not indicate Android support.

### How often is Field of View Calculator updated?

The latest version is 1.0.3, and the app was last updated on February 27, 2026. This suggests a very recent or future update, indicating ongoing development.

### What is the age rating for Field of View Calculator?

Field of View Calculator has an age rating of 4+, making it suitable for a wide range of users.

### Does Field of View Calculator have ads?

No, Field of View Calculator does not contain advertisements. It is a free application without any ad interruptions.

## Version history (last 4 releases)

### 1.0.3 — 2026-02-27

Fix bugs

### 1.0.2 — 2018-08-25

This app has been updated by Apple to display the Apple Watch app icon.

Updated app icon

### 1.0.1 — 2015-05-19

Small bug fix.

### 1.0.0 — 2015-04-04

No release notes.

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## More apps by Apogee Instruments

- [Light Unit Converter](https://appshunter.io/ios/app/light-unit-converter/id974693252)
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All apps by Apogee Instruments: https://appshunter.io/developer/955609109

## Related topics

[apogee instruments](https://appshunter.io/ios/topics/apogee-instruments)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*